نشریه فیزیولوژی محیطی گیاهی
پیاپی 65 (بهار 1401)

Drought stress is one of the main factors in reducing the usefulness of various plants, especially legumes, so it is necessary to use methods that can reduce the effects of stress on the plant. In order to investigate the effect of zinc and gibberellin on the biochemical and physiological characteristics of white beans (Phaseolus vulgaris L.) in drought stress conditions, an experiment in the form of double-plotted plot with a randomized complete block with three replications in two locations (Islamabad West Research Station). Kermanshah province, and Khorramabad research station in Lorestan province. Experimental factors include irrigation at 3 levels of 60, 90 and 120 mm evaporation from Class A evaporation pan as the main plot, zinc sulfate solution at 4 levels 0, 1.5, 3.5 and 4.5 ml/liter and 2 levels Gibberellin spraying and spraying were used as sub-plots. Data analysis and comparison of average data by Duncan's method was performed at 5% level by SPSS software. The results showed that the main effect of drought stress and zinc sulfate foliar application was significant on all traits, and the main effect of gibberellin foliar application on all traits was significant except for yield and transpiration rate. The interaction of zinc sulfate, stress and gibberellin had all significant properties. The highest grain yield was related to normal irrigation treatment and consumption of 4.5 ‌ml/l of zinc at, which differed from the treatment of moderate stress and consumption of 1.5 ‌ ml/l of zinc and the use of gibberellin. It did not make much sense. The lowest grain yield in the severe stress treatment and the use of 3.5 milliliters per liter on the gibberellin spray solution. In general, seed yield increased both in drought stress and non-stress conditions, so according to the results, it is recommended to consume 4.5  ml/l of zinc sulfate and Gibberellin foliar application to reduce the effects of drought stress on bean cultivation.

Dodder is a one of the major parasitic weeds in the world. Dodder infestations reduce crop yield and increase harvesting costs. Different methods have been suggested to control of dodder, but none of them have been able to control these plants reliably. It seems that using resistant varieties is the best option to achieve this goal. In this study, resistance of 15 varieties of tomato to dodder infection (Cuscuta campestris Yunck.) were investigated under greenhouse conditions. Among these varieties, two susceptible and resistant varieties (Supra Urbana and Super Chef, respectively) were selected and catalase, guaiacol peroxidase, ascorbate peroxidase, total phenolic compound, proline, flavonoid and soluble sugars was evaluated at different times after infection (0, 24, 48, 72, 96, 120 and 240 Hours). The results showed that dodder infection increased the enzymes concentration (catalase, guaiacol peroxidase, ascorbate peroxidase) compared to the non- infection treatment. Also, the amount of these enzymes in resistant cultivar were higher than susceptible cultivar. Variety and sampling time affected on total phenol content, proline, flavonoids and soluble sugars. Total phenolic compound and flavonoid levels increased after attaching the dodder to the tomato and reached its highest level at 240 h after attachment. This results indicates the induction antioxidant defence system in tomato under dodder infection. The results of this study show that contamination of tomato with dodder induces the immune system in this plant. Given that it is not possible to perfect control of parasitic weeds without crop damage, it can be very useful to know the defence mechanisms by which cultivars resistant to parasitic plants stand.

This study was conducted to evaluate the ability to grow and reduce water salinity by quinoa and wheat plants in greenhouse and hydroponic. This research was conducted in the form of a two-factor factorial experiment based on a randomized complete block design with three replications. The treatments included 4 salinity levels of zero (control), 5, 10 and 15 dS / m and two species of wheat and quinoa. In this study, traits such as total plant dry weight, accumulation of calcium, magnesium, sodium, potassium and total plant chlorine and the efficiency of water uptake by plants were measured. The results of this study showed that quinoa has more ability to absorb and accumulate elements than wheat and is a plant resistant to salinity stress. The results showed that the concentrations of sodium, chlorine and magnesium per plant (5.48, 10.12 and 1.12 g for wheat and 10.76, 11.65 and 2.66 g for wheat, respectively). Absorption efficiency of sodium, chlorine and magnesium from water (12.28%, 11.30% and 20.22% for wheat and 23.12%, 14.60% and 24.79% for quinoa, respectively). The results also showed that the amount of sodium, chlorine and magnesium accumulated in the plant and the efficiency of phytodesalination of sodium, chlorine and magnesium from saline water significantly increased with increasing in salinity for both wheat and quinoa. In the case of calcium and potassium bioaccumulation and phytodesalination efficiency decreased with increasing salinity. As a result, quinoa showed a significant bioaccumulation efficiency in dry weight production, compared to wheat, so it can be considered as an alternative plant for cultivation in salinity and dry climate conditions.

The aim of this research was to study the effect of salicylic acid (SA) usage on some physiological characteristics and essential oil production of lemon verbena (Lippia citrodora L.) under salinity stress. For this purpose, a pot factorial experiment was performed based on a completely randomized design with 4 salinity levels (0, 50, 100 and 150 mM NaCl), 4 SA levels (0, 150, 300 and 450 mg/L) and three replications. The measured traits included total soluble protein, malondialdehyde (MDA), hydrogen peroxide, glycine betaine, some antioxidant enzyme activities, and essential oil production. The interaction effect of the treatments on all of the studied traits were significant at 1% P value. The results showed that the highest amount of total soluble protein, MDA, hydrogen peroxide, glycine betaine, ascorbate peroxidase and superoxide dismutase activities were observed at 150 mM salinity level and application of SA at 300 mg/L causes to decrease total soluble protein and glycine betaine, and 150 mg/L of SA causes to decrease MDA. But application of this plant growth regulator had no significant effect on hydrogen peroxide. Also, the results showed that catalase enzyme activity and essential oil content at the highest salinity level (150 mM) reached to the lowest amounts. In total, the results of this study indicated that the SA application especially at 300 mg/L causes to improve the studied traits in this experiment and its usage under stress conditions is recommended.

Lack of water is one of the limiting factors for growth, and oxidative stress is a secondary stress resulting from drought and dehydration. In order to study the levels of potassium nanoclat fertilizers, potassium sulfate and salicylic acid in reducing water effects on a number of physiological indicators of evergreen plants, experimental spring was performed as a factorial based on a completely randomized design with three replications in 1398 in the research greenhouse of Islamic Azad University, Gorgan Branch. Factors involved included irrigation at two levels, consumption of potassium fertilizer at two levels of potassium nanocat and potassium sulfate, and salicylic acid at three levels of zero, one and two milliliters. Physiological traits such as photosynthetic pigments, proline, phenol total, superoxide dismutase, catalase enzyme, soluble sugar, protein and glycine betaine were evaluated. Based on the results of this study, dehydration stress significantly increased the levels of proline, the enzyme peroxidase, the enzyme catalase, glycine betaine and sugar, and reduced the levels of chlorophyll a, b, whole leaves and total protein. The use of salicylic acid leaf in conditions of dehydration stress in concentrations significantly increased sugar, total protein, glycine betaine and total phenol. The use of potassium nanocatalysts and potassium sulfate improved plant tolerance in drought stress conditions and increased physiological traits compared to control.

In order to selection of best individual caused Iranian traditional rice variety, Tarommahalli (as the female parent), and a mutant Tarommahalli, (as the male parent) crosses an experiment was conducted using 350 individulas of F2 generation. from which F1 and F2 generations were developed. Evaluation of the parents, F1 and F2 generations was carried out at the Gonbad Kavous University at 2017. 50 plants of both the F1 population and the parents and 350 individuals of the F2 population were grown in an experimental field with a spacing of 25 cm × 25 cm. Chlorophyll fluorescence properties Fo, F'o, Fm, F'm, F ', ETR, Fv, Fv / Fm, F'v / F'm, NPQ, qP, Y (II), qN, qL and weight of 100 grains, tiller number, filled grains number, unfilled grains number, plant height, panicle length, stem diameter, grain length, width and shape, straw weight, grain filling period, flag leaf length and width were recorded. The rate of electron transfer through photosystem II, flag leaf width, base fluoresce in dark-adapted conditions, the number of fertile tillers, maximum fluorescence in the dark-adapted conditions, number of primary branches, flag leaf area, flag leaf length, main panicle length and plant weight had the highest effect on grain yield, respectively. The highest response to selection belongs to 9th economic weight (heritability) in both BLPSI and LPSI indices. After, sixth coefficients (correlation) had the highest response to the selection. The results showed that the inheritance of Chlorophyll fluorescence parameters can be effectively used as an economic weight in the selection of the best individual. Genotypes 3, 6, 17, 24 and 30 were selected based on LPSI and genotypes 3 and 6 based on BLPSI as superior genotypes. The BLPSI and LPSI indices had high efficiency in this research and are recommended for improving the rice grain yield.

The aim of this study was to investigate the interaction of salinity and chromium stress on some morphological and physiological characteristics of portulaca oleracea. In a completely randomized design with 3 replications and 4 salinity levels (0, 4, 8 and 12 dS/m) using sodium chloride every 4 days through irrigation and 5 levels of chromium (0, 7, 14, 21 and 28 mg/ml). Kg (dry weight of soil) experiment was performed and before sowing seeds in soil with increasing potassium dichromate to soil, different levels of chromium treatment were prepared. The values of ion leakage, fresh and dry weight and leaf area, chlorophyll a, b and total, chlorophyll stability coefficient, carotenoids, photosystem II efficiency and relative water content of leaves were measured after 60 days of planting. The results showed that with increasing different levels of chromium and salinity, a significant decreasing trend (P≤0.05) was observed in fresh and dry weight, leaf area, chlorophyll a, b and total, carotenoids, photosystem II efficiency. The lowest efficiency of photosystem II and the highest rate of ion leakage were observed at salinity levels of 12 dS/m and chromium 28 mg/kg. The interaction of salinity and chromium had a significant decreasing effect on chlorophyll content, fresh and dry weight and leaf area. Was alone. However, salinity and chromium reduced the growth of portulaca oleracea leaves.

The use of plant hormones in the last decade has been considered due to the expansion of sustainable agriculture and therefore should be investigated in the integrated management of crops. In order to investigate the effect of application of different plant hormones (auxin and gibberellin) on some agronomic, physiological and biochemical characteristics of sorrel under different levels of humic acid, an experiment was conducted as split plots in a randomized complete block design with 3 replications was carried out in research farm of the Agricultural Research Institute of Zabol University (Chah Nimeh) for two years. The main factor includes two concentrations of humic acid (0 and 5 liters per hectare) and the secondary factor includes nine concentrations of foliar application including control (foliar application with distilled water), auxin hormone (IBA) in concentrations of 10, 20, 30 and 40 mg / l. IBA and gibberellin at concentrations of 15, 30, 45 and 60 mg / L. The results of combined analysis of data showed that the three-way effect of experimental treatments was not significant for any of the studied traits but the interaction of humic acid and foliar application was significant for all studied traits. Humic acid significantly increased plant height, number of seeds per pod, leaf chlorophyll percentage, protein percentage, harvest index, grain yield, mucilage and unsaturated fatty acid, as well as foliar application of 20 mg / l IBA increased plant height Number of seeds per pod, 1000 seed weight and leaf chlorophyll and levels of 60 and 45 mg / l gibberellin Plant height traits Weight 1000 seedlings. In general, it can be concluded that the level of 5 liters per hectare humic acid and foliar spraying of 20 mg per liter of IBA is suitable for sorrel.

Micro algaes have a major role in food chains and aquatic ecosystems. Among the mono cellular algaes in the paddy fields which locted in Mazandaran state, Chlorella vulgaris is an important species in Chlorophyta phylum. Influence of herbicides as the most serious particle of pesticides on the algaes is very considerable. Thererfore this study is performed in orther to determination effect of pertilachlor on the some properties of Chlorella vulgaris. Nine treatments (0, 20, 30, 40, 50, 75, 100, 150 and 300 mg herbicide per 1 liter) prepared in one litter bottle, then 100 cc algae solution and stock culture was added, next this system aerated. Treatments with three replications during 24, 48, 72 and 96 hours were investigated. After treating, effect of pretilachlor on the desity, chlorophyll a concentration, activity of catalase, peroxidase, ascorbat peroxidase, polyphenoloxidase enzymes and lipidic peroxidation were examined. Herbicide increasing at the all times resulted in significant reduction about cellular density (p < 0.0001). Maximum and minimum cellular density was measured in the control (without herbicide) and 300 mg pertilachlor treatment, respectively. The less Chl a consentration was obsereved in the most dose herbicide. Activity rate of quadruple enzymes in long term (9 days), indicated significant loss with increasing herbicide dose. Also lipidic peroxidation in all treatments was more relative to control. In this study was shown enzymes activity in high pretilachlor concentrations was not enough that can prevent the reactive oxygen species and this material was targeted by herbicide.

Accumulation of fructan in different organs of wheat plants is important physiological factor to cope with different environmental stresses. Fructans are fructose based oligo- and polysaccharides derived from sucrose. Depend on the linkage among frucosyle residues, different types of fructan molecules could be found in the plant species. In wheat stem, levan-type (containing β-(2,1) linkage) and graminan-type fructan (containing β-(2,1) and β-(2,6) linkages) are accumulated. Three different enzymes of 1-SST, 6-SFT, and 1-FFT are believed to be involved in wheat fructan biosynthesis. Since the fructan synthesis in wheat is complex, therefore various type and amount of fructan are found among wheat cultivars. Hydrolysis of fructans are catalyzed by 1-FEH and 6-FEH preferentially degrading β-(2,1) and β-(2,6) linked fructan, respectively. Wheat cultivar with greater fructan accumulation and mobilization in the stem are resistance to terminal heat and drought stresses. Fructans increases tolerance to salt stress by cell membrane stabilization, osmotic adjustment and preservation of current photosynthesis. During cold hardening, wheat seedling accumulates water soluble carbohydrates as well as fructan in their leaves and crown