جستجوی مقالات مرتبط با کلیدواژه "کلرید سدیم" در نشریات گروه "زراعت"

In modern agriculture, identifying salt-tolerant plants is crucial for efficient utilization of saline water and enhancing productivity. However, plant salt tolerance can vary across different growth stages. Basil (Ocimum basilicum L.), an annual herb belonging to the Lamiaceae family, not only imparts an exquisite flavor to our meals but also possesses remarkable medicinal properties and diverse applications. Given the significance of basil and the widespread challenge of soil salinity, a research study was conducted to investigate the effect of salinity stress on germination and seedling characteristics of basil. This experiment was designed as a completely randomized block design with 4 replications in the Agronomy Laboratory. 4 salinity levels (0, 50, 100, and 150 mM) were imposed using sodium chloride salt. All data were analyzed using the SAS software. Mean comparisons were performed using Duncan's test at a 5% probability level. The results demonstrated that soil salinity significantly impacted basil germination and seedling growth. The highest percentage and rate of germination, stem and root length, and fresh and dry weight of seedlings were observed in the control treatment (without salinity). Conversely, the lowest values of these parameters were recorded in the 150 mM salinity treatment. These findings indicate that basil is sensitive to salinity stress, and increasing soil salinity substantially impairs its germination and growth.

Salinity is the most significant environmental stress that limits plant productivity by affecting morphology, physiology, and biochemistry of plants, especially in semi-arid and arid regions. Salinity disrupts and eventually delays seedling growth by delaying seed germination and reducing the germination rate. Seed priming stands out as a quick, easy, low-cost, and effective strategy for improving germination, seedling growth parameters, and overall plant defense against abiotic stresses in many crops. It is defined as the pre-sowing seed treatment during which seeds are immersed in water or chemical solutions and are dry until further use. The aim of this study was to assess the effect of priming with sodium nitroprusside on germination indices and biochemical traits in rice seedlings under salinity stress.

This experiment was conducted as a factorial based on a completely randomized design with three replications at the University of Mohaghegh Ardabili in 2023. Experimental treatments included four salinity levels (0, 50, 100, and 150 mM) and three levels of sodium nitroprusside (0, 40, and 80 µM).

The results showed that salinity reduced germination and growth indicators including mean daily germination (MDG), germination coefficient (GC), allometric coefficient (AC), radicle length (RL), pedicel length (PL) and seedling length (SL), as well as radicle and pedicel fresh and dry weight (RFW, PFW, RDW and PDW), but seed pretreatment with different levels of sodium nitroprusside, especially the level of 80 µM, improved these traits. Salinity reduced the seedling moisture percentage (SMP), so that the highest SMP (70.13%) was observed in the control treatment. The highest daily germination rate (DGR) and malondialdehyde content (MDA) were observed at a salinity of 150 mM. Priming decreased DGS and MDA, so that the lowest DGS (0.08) and MDA (0.159 mM g-1 FW) were obtained in priming with 80 μM sodium nitroprusside. Also, salinity decreased the activity of the α-amylase enzyme, so the lowest α-amylase activity (7.93 mg g-1 FW seed) was obtained in the control (distilled water) and at a salinity of 150 mM.

The results showed that seed treatment with sodium nitroprusside at 80 µM is the most effective method to improve rice germination and biochemical traits under salinity stress. It can reduce the harmful effects of salinity on some traits in rice seedlings and improve seedling growth.

Environmental stresses, including salinity, reult in the overproduction of reactive oxygen species, which, at high levels, can cause oxidative damage, impair membrane lipid functions, inactivate enzymes, and impede the metabolic activities of the plant. Salinity affects seedling growth through osmotic stress, ionic toxicity, lack of absorption of essential elements and water, production of free radicals, cell membrane destruction, and reduction of cell division. Seed priming is a quick, easy, low-cost, and effective strategy for improving germination. It is a seed treatment before planting in which seeds are fully immersed in special solutions and dried until further use. Seed priming assists the germinating seed in mitigating saline stress by neutralizing ionic toxicity or by promoting defense mechanisms. This study aimed to assess the effect of seed priming with vitamin U (S-Methylmethionine) on germination and the physiological and biochemical characteristics of sunflower seedlings under salinity stress.

This experiment was conducted in 2023 as a factorial based on a completely randomized design with three replications at the University of Mohaghegh Ardabili. Experimental treatments included four salinity levels (0, 50, 100, and 150 mM) and three levels of vitamin U (0, 2, and 4 mM).

The results showed that salinity reduced the germination and growth indicators, including Germination Rate (GR), Germination Percentage (GP), Mean Daily Germination (MDG), Seedling Length (SL), Seedling Dry Weight (SDW), Seedling Length Vigor Index (SLVI), and Seedling Weight Vigor Index (SWVI); but seed pretreatment with different levels of vitamin U, especially the level of 4 mM, improved these traits. Daily Germination Speed (DGS) was higher by about 25% compared with the control treatment without salinity and, in priming with vitamin U compared with the control (distilled water), it showed a decrease of about 32%. Compared with the control (distilled water), the catalase, peroxidase, superoxide dismutase activities, and proline content of seedlings obtained from primed seeds increased respectively by 9%, 8%, 32%, and 47% after vitamin U treatment. With increasing salinity levels, there was a reduction trend in total seed protein content (0.384 mg g-1 FW), and the lowest total seed protein content was observed at salinity 150 mM. Mean Germination Time (MGT) and malondialdehyde content of seedlings in the priming with a concentration of 4 mM vitamin U and without salinity showed a decrease of about 73% and 21%, respectively, compared with the control (distilled water) and salinity 150 mM.

The results of this research showed that sunflower seed priming with vitamin U at a concentration of 4 mM is the most effective method to improve the germination and biochemical characteristics of seedlings, and stimulating antioxidant enzymes can reduce the harmful effects of salinity on some traits in sunflower seedlings and improve seedling growth.

In order to investigate the effect of different concentrations of KNO3 on physiological and biochemical properties of maize (Zea mays L.) under salinity stress a factorial experiment was conducted based on completely randomized design at the University of Mohaghegh Ardabili in 2021. Treatments included three salinity levels (0, 100 and 200 Mm) and three KNO3 levels (0, 1.5 and 3%). The results showed that the highest germination percentage (GP), germination rate (GR), germination uniformity (GU), radicle and plumule length (RL and PL) and radicle fresh and dry weight (RFW and RDW) was related to priming with KNO3 3% and without salinity. Mean of germination time (MGT) compared to the control showed a reduction about 53%. The activity of catalase, peroxidase and superoxide dismutase enzymes in priming with KNO3 3% and 200 mM salinity compared to the control showed an increase about 56, 68 and 67%, respectively. Salinity decreased the activity of amylase, but priming with KNO3 increased the activity of this enzyme. The total seed protein content in KNO3 3% pretreatment and without salinity was increased about 63%. In general, priming with KNO3 3% solution can be considered as the best treatment to improve the physiological and biochemical properties of corn under salinity stress.

In order to investigate the effect of priming on seed germination indices and antioxidant enzyme activity in chickpea seedlings under salinity stress and an experiment was conducted based on completely randomized design arranged in factorial with three replications at University of Mohaghegh Ardabili in 2023 with 3 replications. Treatments were four salinity levels (0, 50, 75 and 100 mM Derived from sodium chloride) and four levels of priming (without priming (control), hydropriming, priming with gibberellin (50 ppm) and salicylic acid (100 ppm)). The results showed that salinity stress reduced germination percentage (GP), daily germination coefficient (DGC), plumlue fresh weight (PFW). But seed priming with distilled water, salicylic acid, especially gibberellin improved these traits. Salinity increased the mean germination time (MGT), so that the highest (0.0387 seed per day) was observed at salinity of 100 Mm. The highest radicle fresh weight (RFW) (110.967 mg), radicle dry weight (RDW) (19.600 mg), plumule dry weight (PDW) (14.667 mg), seed length and weight vigor index (SLVI and SWVI) (12.041and 3.288) were observed in priming with gibberellin and control. The activity of catalase and glutathione enzymes reductase in priming with gibberellin were the application 66 and 42% higher than the control. The activity of peroxidase (enzyme in gibberellin treatment and salinity of 100 mM compared to the control showed an increase about 96%. Also. lowest amylase (2.1384 mg g-1 FW min-1) was obtained in salinity of 100 mM. In general, the results showed that gibberellin by stimulating antioxidant enzymes and neutralizing free radicals can reduce the harmful effects of salinity stress on some traits in chickpea seedlings and improve seedling growth

At present, the drastic increase in population has created an additional burden on the world's agricultural resources. As a result, meeting global food demand and increasing farmers' incomes has become a challenging task. Salinity is one of the abiotic stresses that strongly affect the germination, growth, and yield of crops. Seed priming is a simple technology that hydrates seeds to the point where the metabolic activity for germination is initiated without radicle emergence. In fact, the seeds are physiologically and biochemically prepared to germinate before being placed in their bed and exposed to environmental conditions. This research was conducted to investigate the effect of seed priming with chitosan on germination indices and biochemical traits of beans under salt stress.

This experiment was conducted at the University of Mohaghegh Ardabili in 2021 as a factorial in the form of a completely randomized design with four repetitions. The treatments included four levels of salinity (0, 50, 100, and 150 mM) and four levels of chitosan (0, 0.25, 0.50, and 0.75% w/v), all of which were dissolved in 1% acetic acid.

The results showed that salinity stress decreased germination percentage (GP), peak value (PV), and germination value (GV). However, seed priming with different levels of chitosan, especially 0.75% chitosan, improved GP, PV, and GV by 7, 21, and 17%, respectively, compared to the control. Proline content and polyphenol oxidase enzyme activity went up with increasing salinity. However, the application of chitosan 0.75% increased these traits by 34% and 43%, respectively, compared to the control (priming with distilled water). Electrolyte leakage in priming with 0.75% chitosan decreased by 31% compared to the control, which indicates the maintenance of the cell membrane stability. The content of soluble sugars in the treatment with 0.75% chitosan and 150 mM salinity showed an increase of about 78% compared to the control. The highest correlation among traits was observed between peak value and germination coefficient (r2=0.99) and between proline and polyphenol oxidase enzyme (r2=0.92).

The results of this study show that among the different treatments, pre-treatment of seeds with 75 % Chitosan may be considered an effective way to improve germination indices and biochemical characteristics of beans and it can be used as a treatment to deal with salinity conditions in bean seedlings and improve their seedling growth.

In order to investigate Effect of different concentrations of urea on physiological and biochemical properties of maize (Zea mays L.) under Salinity Stress a factorial experiment was conducted based on completely randomized design at the University of Mohaghegh Ardabili in 2021. The investigated factors were different levels of salinity (zero, 100 and 200 mM) and different levels of urea solution (zero, 1.5 and 3%). The results showed that salinity stress decreased Germination Percentage (GP), Germination Rate (GR), Germination uniformity (GU), Radicle and Pedicel Length (RL and PL) and Radicle Fresh and Dry Weight (RFW and RDW), But priming with urea improved these traits. The highest Medium Germination Time (MGT) was related at 200 mM salinity and control (distilled water). The activity of catalase and peroxidase enzymes increased with salinity intensification and the highest amount was observed at 200 mM salinity. Priming with 3% urea solution improved these enzymes. The superoxide dismutase enzyme activity in priming with 3% urea and 200 mM salinity compared to the control showed an increase about 61%. Amylase and protein in pretreatment with urea 3% and without salinity compared to the control showed an increase respectively about 73% and 70%. According to the observed results, seeds primed with 3% urea solution had the greatest effect on salinity stress in maize. According to the observed results, seeds primed with 3% urea solution had the greatest effect on salinity stress in maize.

Salinity is one of the abiotic stress factors that causes great damage to the production of agricultural products around the world. Various strategies have been adopted to reduce the negative effect of salinity on plants and to improve the growth and development of plants under salinity stress conditions. In the present study, the effect of silicon foliar application on decreasing the effects of salinity stress and its related physiological mechanisms in hot pepper plants has been investigated. The research was conducted as a factorial experiment based on completely randomized design with three replications in the greenhouse of Ilam University. The treatments tested in this research included three levels of salinity stress (control, 75 and 150 mM NaCl) and four levels of silicon (control, 0.5, 1 and 2 mM). In the stage of four expanded leaves, silicon treatment was applied as a foliar spray in the mentioned concentrations until the surface of the leaves was completely wet, and it was repeated two more times after one month. Salinity treatment was done by preparing NaCl solution and i the plants with fertilizer solution every three days. The treatments were continued until fruiting and complete fruit harvesting. In the final results obtained from this research, it was found that salinity caused a significant decrease in growth and performance parameters (root and shoot dry weight, plant height, number of fruits per plant and crop yield) as well as a decrease in relative water content and chlorophyll and caused increase in the content of proline, malondialdehyde and ion leakage in pepper plants. The results showed that the application of silicon reduced the effects of salinity stress on pepper plants. The highest total yield was obtained in 1 and 2 mM silicon application under non-saline irrigation. At all salinity levels, the application of silicon increased the growth and yield of pepper plants. These results were related to the increase in relative water content and chlorophyll, and decreases in proline, malondialdehyde accumulaion and electrolyte leakage. In general, the results of this research indicated that the application of silicon, especially in concentrations of 1 and 2 mM, improved the growth and performance of hot pepper plants under stress and non-stress conditions. The exogenous application of silicon alleviated the negative effects of salinity on the plant by increasing the amount of chlorophyll and relative water content and decrease proline and malondialdehyde. Although the application of silicon in non-saline conditions had positive effects on plant growth and performance, it was more effective in saline conditions. Therefore, silicon foliar spraying is recommended to decrease the effects of salinity on the growth and performance of hot pepper plants.

Priming prepares the seeds physiologically and biochemically for germination before being placed in their bed and exposed to the salinity stress. In order to investigate the effect of different levels of chitosan on physiological and biochemical traits in French bean (Phaseolus vulgaris L. CV. Sadri) under salinity stress, a factorial experiment was conducted based on a completely randomized design with four replications at the University of Mohaghegh Ardabili in 2021. Factors included four salinity levels (0, 50, 100 and 150 mM) and four chitosan levels (0, 0.25, 0.50 and 0.75% by weight-volume). The results showed that salinity stress decreased germination percentage (GP) and increased mean germination time (MGT) and residual dry weight (RDW). Chitosan reduced the effect of salinity and improved GP and Seedling Moisture Percentage (SMP). With increasing salinity, seed reserves utilization rate (SRUR), seed reserve utilization efficiency (SRUE) and deduction of used seed reserves (DUSR) decreased. The highest and the lowest of SRUR, DUSR and SR were obtained from the application of salinity levels of 50 and 150 Mm, respectively. The amount of SRUR, SRUE and DUSR in 0.75 chitosan priming was higher about 10.4, 9.6 and 7.2%, respectively, compared to the control treatment (priming with distilled water). SRUE and SR reduction was about 13.4 and 8.3%, respectively compared to the control without salinity. Also, the amount of Protein and Phytin in pretreatment with 0.75% chitosan and 0 mM salinity showed an increase about 30% and 47% compared to the control, respectively. In general, seed pretreatment with appropriate concentrations of chitosan especially 0.75% chitosan improves growth and reduces the adverse effects of salinity on the bean plant.

Salt stress is one of the most important factors limiting the growth, development and the yield of plants that cause structural changes in important plant organs such as stems, roots, leaves and petioles. In salinity conditions, the pomegranate tree cannot produce an economic product. Therefore, identification and use of selected pomegranate cultivars tolerant to salinity stress are necessary for breeding programs, introducing better cultivars and developing the pomegranate industry. Morphological and physicochemical changes can be used as indicators for selecting tolerant cultivars.

This study was conducted in 2019 in a factorial design based on a completely randomized block design in four replications in the laboratory of the department of horticultural sciences at Gorgan University of Agricultural Sciences and Natural Resources. The first factor was pomegranate genotypes in 15 levels, including four wild genotypes (Vahshi Inchehbrun, Vahshi Aliabad and Vahshi Kordkoi from Golestan province, and Miankaleh from Mazandaran province), eight local genotypes (Qand and Torsh Galoogah, Shirin, Torsh, and Gol Anar Behshahr, Fereshteh qermez Sari, Shirin and Torsh Shivand of Khuzestan), two commercial export genotypes (Yosefkhani and Malas momtaz Saveh) and one foreign genotype (Wonderful) and the second factor was the salinity at three levels including control, 2.5 and 6.4 grams per liter of sodium chloride (EC 1.4, 4 and 8 dS/m, respectively). After rooting of the cuttings and growing the new pot plants, salinity stress was applied for 10 weeks. Then, the morphological, physicochemical and phytochemical traits were measured.

The results showed that after applying salinity stress in all genotypes and cultivars, morphological and physicochemical traits such as stem length, stem diameter, the number of branches, the total number of leaves, root length, root diameter, leaf surface and leaf fresh weight, leaf dry weight, the relative water content of leaf, chlorophyll, total phenol and anthocyanin decreased in comparison with the control. Some of the other physicochemical and phytochemical traits such as electrolyte leakage, the percentage of abscised leaves and the percentage of necrotic leaves, cell membrane damage, salinity damage index and proline increased in comparison with the control. Also, the responses of genotypes were different in terms of tolerance to salinity stress and growth traits. Some of the cultivars were introduced as tolerant cultivars, some as semi-tolerant and some others as sensitive. With increasing the salinity stress, the amount of morphological, physicochemical and phytochemical traits changed significantly in sensitive cultivars. Moreover, the results of the analysis of variance showed that the effect of salinity on all measured traits was significant except the root dry weight.

Based on the obtained results, and after ranking and standardization, the Wonderful cultivar was recognized as the most tolerant cultivar. It was able to tolerate the salinity of 6.4 grams per liter of sodium chloride (8 dS/m) well; followed by Fereshteh qermez and Malas Saveh. Torsh Galoogah, Torsh Shivand, Vahshi Inchehbrun, Shirin Shivand, Qand Galoogah, and Vahshi Miankaleh were identified as semi-tolerant cultivars and Vahshi Aliabad, Torsh Behshahr, Gol Anar behshahr, Vahshi Kordkoy and Shirin Behshahr were identified as sensitive cultivars to salt stress.

Introduction Salt stress is one of the most important factors limiting the growth, development and the yield of plants that cause structural changes in important plant organs such as stems, roots, leaves and petioles. In salinity conditions, the pomegranate tree cannot produce an economic product. Therefore, identification and use of selected pomegranate cultivars tolerant to salinity stress are necessary for breeding programs, introducing better cultivars and developing the pomegranate industry. Morphological and physicochemical changes can be used as indicators for selecting tolerant cultivars. Materials and Methods This study was conducted in 2019 in a factorial design based on a completely randomized block design in four replications in the laboratory of the department of horticultural sciences at Gorgan University of Agricultural Sciences and Natural Resources. The first factor was pomegranate genotypes in 15 levels, including four wild genotypes (Vahshi Inchehbrun, Vahshi Aliabad and Vahshi Kordkoi from Golestan province, and Miankaleh from Mazandaran province), eight local genotypes (Qand and Torsh Galoogah, Shirin, Torsh, and Gol Anar Behshahr, Fereshteh qermez Sari, Shirin and Torsh Shivand of Khuzestan), two commercial export genotypes (Yosefkhani and Malas momtaz Saveh) and one foreign genotype (Wonderful) and the second factor was the salinity at three levels including control, 2.5 and 6.4 grams per liter of sodium chloride (EC 1.4, 4 and 8 dS/m, respectively). After rooting of the cuttings and growing the new pot plants, salinity stress was applied for 10 weeks. Then, the morphological, physicochemical and phytochemical traits were measured. Results and Discussion The results showed that after applying salinity stress in all genotypes and cultivars, morphological and physicochemical traits such as stem length, stem diameter, the number of branches, the total number of leaves, root length, root diameter, leaf surface and leaf fresh weight, leaf dry weight, the relative water content of leaf, chlorophyll, total phenol and anthocyanin decreased in comparison with the control. Some of the other physicochemical and phytochemical traits such as electrolyte leakage, the percentage of abscised leaves and the percentage of necrotic leaves, cell membrane damage, salinity damage index and proline increased in comparison with the control. Also, the responses of genotypes were different in terms of tolerance to salinity stress and growth traits. Some of the cultivars were introduced as tolerant cultivars, some as semi-tolerant and some others as sensitive. With increasing the salinity stress, the amount of morphological, physicochemical and phytochemical traits changed significantly in sensitive cultivars. Moreover, the results of the analysis of variance showed that the effect of salinity on all measured traits was significant except the root dry weight. Conclusion Based on the obtained results, and after ranking and standardization, the Wonderful cultivar was recognized as the most tolerant cultivar. It was able to tolerate the salinity of 6.4 grams per liter of sodium chloride (8 dS m-1) well; followed by Fereshteh qermez and Malas Saveh. Torsh Galoogah, Torsh Shivand, Vahshi Inchehbrun, Shirin Shivand, Qand Galoogah, and Vahshi Miankaleh were identified as semi-tolerant cultivars and Vahshi Aliabad, Torsh Behshahr, Gol Anar behshahr, Vahshi Kordkoy and Shirin Behshahr were identified as sensitive cultivars to salt stress.

Seedling germination and establishment are one of the most sensitive stages of plant life that play a role in plant production, proper plant establishment, plant density, and uniformity and management goals. Osmotic stress has a significant effect on germination percentage and rate. Salicornia persica is an annual halophyte plant that can grow in saline environments. According to the studies and the importance of determining the tolerances of salinity and drought tolerance in germination and plant establishment, this study aimed to investigate the effect of osmotic potentials of polyethylene glycol and sodium chloride on germination and fit of time-moisture and time-salinity models of Salicornia seeds.

In order to investigate the effect of osmotic potentials caused by polyethylene glycol and sodium chloride on germination and fit of Hydrotime and Halotime models of Salicornia seeds, two experiments were conducted based on a completely randomized design at Yasouj University in 2020. The first experimental in drought stress treatments included 13 levels of osmotic potential (zero, -0.3, -0.6, -0.9, -1.2, -1.5, -1.8, -21, -2.4, -2.7, -3, 3.3 and -3.6 MPa) which were made of polyethylene glycol 6000 and second in salinity stress included 13 levels of sodium chloride concentration that was iso-osmotic with first experiment (Zero, 62, 122, 187, 249, 311, 368, 435, 498, 560, 622, 684 and 745 mM). After the end of the germination period, the characteristics of germination rate and percentage were calculated and the hydrotime model was used to describe the relationship between germination and water potential, and the halotime model was used to describe the relationship between germination and salinity. To select the best model among the osmotic potentials, root mean square parameters and R2 were used.

The results of mean comparison of effect of osmotic potentials on the percentage of germination showed that in PEG and NaCl treatment, it was almost 100% up to the level of -1.2 and -1.5 MPa, respectively, and after that, a decreasing trend was observed, so that at the level of -3.3 MP showed a decrease of about 90 and 85%, respectively. The output results of the models showed that the coefficient of the hydrotime and halotime models were 96.8 MPa.h and 16181.87 mM.h, respectively, and the drought and salinity tolerance thresholds were -3.28 MPa and 714.62 mM, respectively. The halotime model quantified the germination of Salicornia seeds better than the hydrotime model. Drought stress limits the absorption of water by seeds and affects germination by reducing the movement and transfer of seed reserves or by directly affecting the structure and synthesis of protein in the embryo. Salinity increases the osmotic pressure of the solution and reduces water absorption through the seeds. On the other hand, high salinity causes toxicity and disturbs the ionic balance and reduces seed germination by affecting the vital interactions of the seed.

The rate of decrease in germination rate and percentage in drought stress was higher than salinity stress. Based on the results of this study, using the halotime model in biological studies of halophyte plants under osmotic stress, the tolerance threshold and the time required for germination at different salt concentrations can be well determined.

 Lallemantia royleana is an annual herbaceous plant of Lamiaceae family in different parts of Europe, the Middle East, and especially Iran. Cyamopsis tetragonoloba L. is a plant of the legume family. A common feature between these two plants is hydrocolloid gums, which stabilize some food emulsions by absorbing water and increasing the viscosity or forming a gel in the aqueous phase. Due to its diverse and rich vegetation, Iran can produce countless types of plant gums, and many seeds such as Lallemantia royleana and Cyamopsis tetragonoloba contain valuable gums. Considering the important therapeutic and industrial applications of C. tetragonoloba and L. royleanaplants and the need for more information and reports on determining the best humic acid level and salt stress tolerance of these plants, the purpose of this research is to investigate the tolerance of two L.  royleana and C. tetragonoloba plants to salinity stress in the germination stage and the initial stages of the growth of two plants under the humic acid application.

The experiment was carried out as factorial in a completely randomized design with three replications at the seed laboratory of the Faculty of Agriculture of Zabol University in 1400. In this experiment, salinity stress was investigated using sodium chloride at control (no salinity), 70, 140, 210 mM levels and humic acid at (0, 40, 80, and 120 mg/L) levels. Humic acid solution at different salinity levels was added to each petri dish containing 25 seeds.

 The results showed that salinity stress decreased germination percentage, radicle length, plumule length, seedling length and seedling dry weight of C. tetragonoloba. In this plant, the germination percentage decreased by 35.34% compared to the control as the salinity stress level increased to 210 mM, and with the increase of the stress to more than 140 mM, a significant decrease in the germination percentage was observed. The maximum plumule length of L. royleanaplants was obtained in 70 mM salinity treatment and 40 mg/L fertilizer level. The maximum radicle length in the L.  royleanaplants plant was obtained in the treatment of 40 mg/L of humic acid at a 70 mM salinity stress level. Also, the results showed that the maximum radicle length (1.46 cm) in the C.  tetragonoloba plant was related to humic acid pretreatment at 70 and 140 mM salinity and fertilizer levels of 40 and 80 mg/L.

 In general, it can be stated that the germination indices significantly decreased under stress conditions, and this indicates that humic acid is a suitable pretreatment that can improve the growth indices of C. tetragonoloba and L.  royleanaplants under stressed and non-stressed conditions. With the application of humic acid at all salinity levels except 210 mM, the germination indices in the two mentioned plants were in a favorable condition.

1- The salinity stress tolerance threshold was studied in Cyamopsis tetragonoloba and Lallemantia plants.
2- Humic acid fertilizer in this study mitigated the destructive effects of salinity stress in Cyamopsis tetragonoloba and Lallemantia plants.

Today, population growth has placed a significant burden on global agricultural resources. As a result, meeting global food demand and increasing farmers' incomes has become a challenging task. Salinity is one of the most harmful factors in the arid and semi-arid regions of the world that influences crop production. Seed priming is a technology by which seeds are physiologically and biochemically prepared for germination before being placed in their bed and exposed to the ecological conditions of the environment. The aim of this study was to evaluate the efficiency of the effect of chitosan on bean germination indices under salt stress.

The experiment was conducted as factorial based on a completely randomized design with four replications in a row (tube or sandwich culture) between filter paper at the University of Mohaghegh Ardabili in 2021. Treatments included four salinity levels (0, 50, 100, and 150 Mm) and four chitosan levels (0, 25, 50, and 75% by weight volume), all of which had been dissolved in 1% acetic acid. The studied traits included germination coefficient, allometric coefficient, daily germination rate, mean daily germination, seedling length and weight index, radicle length, plumule length, seedling length, radicle fresh and dry weight, plumule fresh and dry weight and residual dry weight. Data analysis was performed using the SAS 9.2 software and Duncan's test at p<0.05 probability level was used for mean comparison.

The results showed that salinity stress decreased allometric coefficient (AC), seedling length vigor index (SLVI), radicle and seedling length (RL and SL), and radicle fresh and dry weight (RFW and RDW) and increased daily germination rate (DGS) and residual dry weight (RDW). Seed pretreatment with chitosan increased AC, SLVI, RL, SL, RFW, and RDW. The comparison of the means showed that there was a significant difference between the levels of chitosan so that the highest number of traits was obtained from the use of 75% chitosan and the lowest was obtained from the chitosan-free treatment. SLVI, SL, and RDW in 75% chitosan pre-treatment were higher at about 31, 26, and 27% compared to the control (priming with distilled water), respectively. The highest AC was observed in priming with 50% chitosan. Comparison of the mean for salinity stress also showed that the highest and lowest values of the measured traits respectively were obtained from the application of 0 and 150 Mm salinity levels. Also, with increasing salinity, chitosan increased germination coefficient (GC), seedling weight vigor index (SWVI), plumule length (PL), and plumule fresh and dry weight (PFW and PDW).

The results of this study show that among the different treatments, pre-treatment of seeds with 75 % Chitosan may be considered an effective way to improve seed germination of bean. It also can reduce the harmful effects of salinity stress on some traits in bean seedlings and improve seedling growth. Also, pretreatment with distilled water is an easy, low-cost and effective way to increase bean seedling germination and growth indices. Farmers can use this method for fast germination and better seedling growth under salt stress conditions.

The effect of different concentrations of chitosan on the germination of bean seeds was investigated.
Priming with chitosan increased the allometric coefficient, seedling length vigor index, radicle and seedling length, and radicle fresh and dry weight.
A suitable method for reducing the harmful effects of salinity and increasing germination indicators of beans was introduced.

Seed germination is an important stage in the life cycle of plants. Seed germination is affected by various environmental stresses such as salinity, high temperature and drought. Squill (Drimia maritima) is a medicinal plant that is used in traditional medicine and the use of seeds is one of the methods of propagation of this plant. There is no information about the effect of environmental stresses on seed germination of this plant. In this study, the effect of temperature treatments (15, 20 and 25 °C) and different salinity levels (0, 50, 100, 150, 200 and 250 mM) on seed germination and seedling growth indices were investigated. The results showed that temperature and salinity treatments have a significant effect on germination and seedling growth indices. At all three temperatures of 15, 20 and 25 °C, seed germination and seedling growth indices decreased under salinity stress and the lowest seed germination and seedling growth were obtained in 200 and 250 mM sodium chloride treatments. At all three temperatures, salinity stress had a inhibitory effect on seedling growth indices such as the length of different seedling sections and the fresh and dry weight of seedlings as well as the seedling vigor index of Squill. The results of the present experiment showed that Squill is sensitive to salinity in the germination stage and the temperature of 20°C is the appropriate temperature for the germination of the Squill’s seed.

In order to investigate the effect of salinity and cadmium (Cd) on yield, chlorophyll content and antioxidant activity of Kochia plant, a factorial experiment in a completely randomized design with three replications was conducted under greenhouse conditions. The experimental treatments included five Cd levels (0, 5, 30, 60 and 90 mg Cd kg-1 soil as cadmium sulphate) and three salinity levels (0, 2.5 and 5 g kg-1 soil as NaCl equal to electrical conductivity (EC) 0.65, 9.4, and 18 dS m-1, respectively). The results showed that mean shoot fresh and dry weight, root weight, and plant height at 5 g NaCl Kg-1, decreased significantly by 22, 24, 23, and 15 %; and at 90 mg Cd Kg-1 soil decreased by 52, 67, 45, and 41%, respectively. The greatest reduction in shoot fresh and dry weight, root dry weight and plant height observed at 5 g NaCl Kg-1 + 90 mg Cd Kg-1 levels. The highest total chlorophyll content observed at control (with no salinity and Cd) and 5 g kg-1 salinity + 5 mg Cd kg-1. With addition of NaCl, the harmful effect of Cd on chlorophyll content of the plant decreased. Salinity and Cd levels had a different effects on antioxidant activity of Koshia plant. However, at higher Cd levels (60 and 90 mg Cd kg-1), with increasing of salinity levels, no significant differences was observed in peroxidase and superoxide dismutase activity. In general, the change in the activity pattern of the plant antioxidant system, especially catalase and superoxide dismutase enzymes under high stress conditions showed that Kochia plant can withstand stress conditions via activating its antioxidant system.

The greenhouse crops recently attract enormous interest in Iran. The extensive greenhouse tomatoes cultivation, established for local and export markets. The salinity of irrigation water is one of limitation factors of greenhouse crops cultivation in arid and semi-arid regions. In this research, survey impact of melatonin and salicylic acid in reducing the destructive aspects of water salinity stress in the early stages of greenhouse tomato growth.

In a factorial split-plot experiment, tomato plants, Goldi cultivar, were exposed to salinity at 0, 50, and 100 mM NaCl as a main factor in hydroponic culture medium. Two sub-factors, Melatonin at 0, 10 μM and salicylic acid 0, 1.5 and 2.5 mM, were foliar sprayed in three time. Before flowerings, one month after transfer to the pot, shoot height and leaf length, leaf number and stem diameter were measured. Two months after planting, fruit weight, number of flowers per inflorescence and chlorophyll fluorescence parameters including minimum fluorescence (Fo), maximum fluorescence (Fm), variable fluorescence (Fv) and photochemical quantum yield (YII) were measured.

The results showed that salinity significantly reduced the vegetative and reproductive growth of tomatoes in greenhouse conditions but salicylic acid did not show a significant effect on vegetative and reproductive characteristics in the early stages of growth. Melatonin significantly increased the growth characteristics of tomato plants such as leaf length and number, plant height and stem diameter in the first month of growth (P <0.01). The results also showed that melatonin had a significant effect on increasing the number of flowers in the inflorescence and the number of fruits per plant in the two months after planting. Also, fluorescence parameters including Fm, Fo, Fv and YII showed a significant decreasing with increasing sodium chloride concentration (P <0.01). The average effective photochemical quantum efficiency of photosystem II decreased from 0.84 in non-stress conditions to 0.76 in salinity. Melatonin caused a significant increase (P <0.01) in the effective photochemical quantum efficiency of photosystem II and maximum and minimum fluorescence of tomato plants, but the application of salicylic acid had no effect on this parameters. The most effective photochemical of photosystem II was 0.84 in non-stress conditions and application of 10 μM melatonin.

The results of this study showed that salinity reduces the initial growth of tomato plants under greenhouse conditions. Salicylic acid did not show a significant effects on vegetative and reproductive characteristics in the early stages of tomato plant growth. Use of melatonin reduces the destructive effects of salinity and increases tomato tolerance to salinity in the early stages of growth.

Salinity is one of the most limiting factors in crop growth and hence many attempts have been undertaken to reduce this stress. Therefore, this study investigated the effect of the interaction of salicylic acid and ascorbic acid on salt stress in St. John's wort (Hypericum perforatum L.) using a completely randomized factorial design. Different concentration of salicylic acid (0.0, 0.3, 0.6, 0.9 mm), ascorbic acid (0.0, 0.1, 0.2 and 0.3) and salt stress (0, 30, 60, 90 and 120 mM) were used. The results showed that pre-treatment of seed priming of salineexposed plants with ascorbic and salicylic acids significantly improved germination percent, germination rate, and germination average time, but had negative effects on these traits. According to the results of this study, It can be concluded that seed priming of St. John's wort either with salicylic or ascorbic acid improves germination traits and plant resistance to salinity.

Satureja rechingeri Jamzad, a member of the Lamiaceae family, is a species endemic to Iran, which has a wide distribution in southern Iran (mainly Khuzestan and Ilam). This plant has many medicinal properties and the main composition of its essential oil is carvacrol (48 to 95%). Carvacrol is mainly involved in biological activities and used in the production of substances such as antibiotics and antioxidants. Drought and salinity stress are the main limiting factors for successful production and yield of crops in Iran and the world. Salinity alters metabolic processes and the activity of enzymes. One of the biochemical changes that occur in plants when exposed to saline environments is the increase in the production of oxygen free radicals. Little is known about the tolerance of this plant to salinity stress. Therefore, this study was performed to quantify the morphophysiological and biochemical responses of Satureja rechingeri to salinity stress using nonlinear models.

This experiment was conducted in a completely randomized design with four replications in greenhouse conditions during 2016-2017. Rooted cuttings were prepared from Khorman Pharmaceutical Company located in Khorramabad (Lorestan) and transferred to the research greenhouse for the Department of Horticulture and Landscape Engineering, Campus of Agriculture and Natural Resources, University of Tehran, located in Karaj (Alborz). Rooted cuttings were kept under favorable conditions for about a month and then transplanted into pots. Six weeks after full establishment, the plants were exposed to different concentrations of sodium chloride (0, 2, 4, 8, and 16 dS / m). Parameters including membrane stability, malondialdehyde level, activities of superoxide dismutase and ascorbate peroxidase, proline content, total phenol, plant height, leaf length and width, stem diameter, herbal fresh and dry weight, and percentage and yield of essential oil were measured. Logistic, sigmoid, and peak models were used to quantify these parameters.Findings and

The effect of salinity stress on most of the parameters was significant (except for stem diameter and essential oil percentage). With increasing NaCl salt concentration, in plants under salinity stress, membrane leakage (250%), proline content (430%), catalase (360%), ascorbate peroxidase (550%), superoxide dismutase (320%), total phenol (350%), and malondialdehyde (280%) increased. Salinity decreased plant height (14%), leaf length and width (21% and 23%), fresh weight of shoot (35%), dry weight of shoot (15%), and essential oil yield (15%). Moreover, changes in morphological characteristics under salinity stress were logistic and in biochemical properties (except those in ascorbate peroxidase, which was peak) were sigmoid.

Satureja rechingeri tolerated salinity up to 4 dS / m, but at higher salinities, herbal fresh and dry weight and plant height significantly reduced.

Salt tolerance at the germination stage is important, because salinity is usually severeat the soil surface.Especially in cases where the groundwater level is high.In order to investigate the effect of primingand salinity stress on the quantitative and qualitative traits of P. oleracea, this experiment was conducted in the Seed Technology Laboratory of the Faculty of Agricultural Sciences of Shahed University in 2019.Experimental agents included pretreatments (control (distilled water), hydro-priming, potassium nitrate and salicylic acid) in response to 6 salinity levels (no salinity as control and salinity of 30, 60, 90, 120 and 200 mM with Sodium Chloride).This experiment was studied as a factorial in a completely randomized design with three replications. The measured traits included germination indices, photosynthetic pigments, anthocyanin content, proline and soluble sugars.The results showed that the highest amount of germination components such as germination percentage (97%), germination rate (2.16 seeds per day), plantletlength (6.69 cm), plantletfresh weight (4 g), plantletlength index (324.69) and RWC (75.25%) were obtained in non-salinity stress and application of hydro-priming pretreatment.At salinity levels of 60 mM, the content of chlorophyll a, chlorophyll b and total chlorophyll in the hydropriming treatment increased and the highest content of proline, soluble sugars and anthocyanin was obtained at the highest salinity level.Among the studied priming levels, hydropriming at salinity stress of 200 mM had the highest percentage and seed germination rate, chlorophyll content, anthocyanin and proline.