جستجوی مقالات مرتبط با کلیدواژه "قطر ریشه" در نشریات گروه "زراعت"

This research was carried out in order to investigate the effect of irrigation regimes on morphological traits of root and shoot of safflower genotypes.

A field experiment has been conducted via polyvinyl chloride (PVC) pipes at research field of Seed and Plant Improvement Institute in Karaj, during 2019-2020. A factorial experiment has been laid out in a randomized complete block design with three replications. This study deals with six genotypes of safflower (Varamin landrace, Hamand landrace, Kazakhstan genotype and Amir, Goldasht and Pernian cultivars) in two irrigation regimes, including full irrigation (control) and drought stress (Irrigation after depletion of 40% and 80% of soil available moisture respectively) treatments.

The results showed that under drought stress conditions, root length and root diameter have increased by 28.6% and 13.6%, respectively and root dry weight, leaf relative water content (RWC), number of bolls, number of seeds per plant and seed yield per plot and was decreased by 23.6%, 15.2%, 25.4%, 63.3%, and 74.9%, respectively. Under full irrigation conditions, Amir with suitable root system (root dry weight 7.7 g and root length 71 cm) and maximum number of seeds had the highest seed yield (5.03 g per plot). In addition, under drought stress conditions, Amir cultivar had early flowering, maximum root dry weight and length, highest activity of catalase and peroxidase enzymes, and the highest seed yield per plot (1.67 g).

Generally, Amir cultivar had more seed yield due to having a suitable root system and superior agronomic characteristics and was selected as the superior genotype.

Breeding new crop cultivars with efficient root systems carries great potential to enhance resource use efficiency, plant adaptation to unstable climates and improve yields. Current study was conducted to investigate the relationship between root characteristics with yield and yield components in 24 lines and cultivar of bread wheat using complete randomized block design with three replications in rainfed conditions of research farm of the University of Zanjan in 2017-18 and 2018-19 growing seasons. The results of combined analysis of variance showed the difference between year and high diversity between genotypes measured for most traits. According to the results of the study of genetic parameters, the highest heritability was related to the number of grains per spike (70.328%) and the heritability of the most root traits was low. There was a negative correlation between yields with the most root traits but root diameter. The results of sequential path analysis showed that in the first stage of chain 1000-grain weight, number of spikes per square meter and number of seeds per spike affected grain yield, and in the second stage, root dry weight and diameter greater than 25cm deep and root volume to a depth of 25cm with effects on 1000-grain weight, root volume greater than 25cm deep and root dry weight to a depth of 25cm with effects on spike number per square meter and root volume to a depth of 25cm with effects on seed number per spike, they Indirectly affected grain yield. The results of factor analysis led to the identification of four factors that explained 82.45% of the differences between the data. Based on the results of cluster analysis, the studied genotypes were divided into three groups. The cultivars and lines in the second group had the highest yield with the highest root volume, diameter, dry weight, surface and length to a depth of 25cm.

Salinity is a major abiotic stress affecting agricultural production. Barley is one of the most tolerant species among glycophyte plants to salt stress. High tolerance of barley to salinity stress is related to its rapid phonological growth and development. Understanding of growth and development of different organs of plant, especially root, is important for optimal management of halophytes (Chen et al., 2008). Root systems can exhibit enormous plasticity on the level of biomass, morphology, and or physiology in response to different environmental parameters such as water and nutrient availability. Because root system traits, such as water uptake rates per surface area, are defined by the properties of individual root segments detailed studies about the abundance, morphology, anatomy, and physiology of individual roots are needed (Rewald et al., 2012). Root length can be the most important characteristics because many researchers believe that the root length per unit volume of soil is the best feature to calculate water uptake by the plant (White and Kirkegaard, 2010). The root diameter reduces in salt stress conditions. It varies in different species (Eshel and Beeckman, 2013). Grouping of accessions by multivariate methods in would be of practical value to wheat breeders in that representative accessions may be chosen from different clusters for breeding purpose and it also helps to define strategies for further collection of germ plasm (Alavi siney et al., 2013).
The objectives of this study were to evaluate effect of NaCl salinity on seedling root traits in doubled haploid barley, grouping, ranking and selecting of superior genotypes based on studied traits.
In order to investigate the effect of NaCl salinity on seedling root traits in doubled haploid barley, a study was carried out as a factorial experiment based on completely randomized design with three replications in the green house of Zanjan University in 2012. Fifty doubled haploid lines were studied in zero (control) and 150 mM salinity levels. Traits of the root area, root angle, cumulative root length, length of the longest root, diameter root were measured with daily imaging of the seedling. Data were analyzed by the analysis of variance (ANOVA) with using SPSS (21). Cluster analysis and Aronachalam and Bandyopadhyay(1984) were used for grouping and ranking the doubled haploid lines respectively.
Results and DiscussionThe results of the variance analysis showed significant differences between lines and interaction of line × salinity for all of traits. The significant differences among lines for the studied traits refer to the presence of considerable variation among lines and give a chance to plant breeders for betterment of these characters through breeding. The significant interaction between lines and Salinity shows a lines specific adaptation to different salinity. Therefore, this diversity can successfully be used for improvement of barley yield. However, the correct selection of doubled haploid lines can be considered as one of the crucial factors in farm management and economic barley production. Generally, salinity was decreased root length and cumulative root length. In four lines did not decrease the root length under salt stress and in three lines didn’t show reduced cumulative root length under salt stress. The root angle, in all lines except the six lines, under Stress-free conditions was greater than the stress condition. Root area showed a downtrend in stress conditions than under normal condition those five lines are not obeyed of the law. The effect of salinity on root diameter did not show similar results among the lines. Using cluster analysis and Arunachalam and Bandyopadhyay (1984) method, barley doubled haploid lines were divided two groups based on studied traits both normal and salinity conditions. Genotypes with 2, 29 and 69 code were selected as superior genotypes in both of conditions.
ConclusionThe results of experiment showed that the root traits are affected by salt stress. Since, it is necessary, we know about the relationship between root traits such as, area and length of root and their relationship with salt stress. Salt stress decreased amount of root area, cumulative length, length of longest root and root angle. Tolerance to salinity is related to all of traits involved in salt tolerance. The root absorbs water and nutrients to the extensive role that it can play a major role in salinity tolerance. Cluster analysis based on the studied traits in both conditions (normal and stress) divided genotypes in two groups and multivariate analysis of variance confirmed these results. Arunachalam and Bandyopadhyay showed genotypes number 2, 29 and 62 were superior genotypes in both conditions. Therefore, these genotypes can be used in both of condition.

The root pulling force as well as the amount of transferred soil have not been reported quantitatively for various sugar beet types. This study was designed to measure the amounts of transferred soil from farm and estimate the root pulling force among sugar beets populations with different root shapes at harvest time. The experiment was conducted as a split plot with a randomized complete block design with four replications at Motahari Research Station, Karaj in 2002 and 2003. Main plots were allocated to soil moisture contents at harvest time and subplots to 7 sugar beet populations with smooth elliptic, conical and grooved conical root (normal beet) forms. Sugar beets were compared at 40% soil water depletion in 2002 and at field capacity as well as 40 percents water depletion in 2003. Broken roots were 8, 10 and 13% for smooth elliptic, conical and normal conical forms, respectively. Percentages of broken roots in smooth elliptic and conical forms were 38 and 23 % less than the normal types, respectively. Pulling forces in these forms were 59 and 52 % less than normal sugar beet, respectively. There were no significant differences for root and white sugar yield among different forms. However, lower losses, soil tare and pulling force of smooth conical roots makes them more preferable than the normal roots, for breeding purposes.

Licorice, Glycyrrhiza glabra (Fabaceae), is one of the herbal medicines. Glycyrrhizin is the importance content through compounds exiting in licorice, which is 50 times sweeter than sucrose. Glycyrrhizin used as the primary matter in pharmacy and used to remedy of many diseases, and also, used in tobacco, confectionary and beverage industries. Since Glycyrrhizin in the phases of growth received at maximum and then decreased; and also to consider of root diameter and harvest time effect on active substance content, This study done for determine the best harvest time and suitable root diameter to obtain the greatest Glycyrrhizin in this plant. For this study, root of Glycyrrhiza glabra were collected in four times (Nov, Dec, Jan and Feb) and in three root diameter (<1 Cm, 1-2 Cm and >2 Cm) from gorgan (Araghi mahalle agricultural station). Variant of measurement in this study were including fresh weight, dry weight (for determination of percentage of humidity) and glycyrrhizin content. Extraction of glycyrrhizin was done with methanol and its measurement done with used hight performance liquid chromatography (HPLC). The result showed that the least root diameter were containing the least humidity percentage (32.46%) and the greatest of glycyrrhizin (1.187%), the root were harvested in Jan., in comparison with other harvest time, were containing the least humidity percentage (22.26%) and the greatest amount of glycyrrhizin (1.112%).