جستجوی مقالات مرتبط با کلیدواژه « stres » در نشریات گروه « زراعت »

Drought is one of the most important factors limiting the growth and production of crops in most parts of the world and Iran and affects as a multidimensional stress on plants at different levels. In order to study drought tolerance of 10 durum wheat genotypes, an experiment was conducted in a randomized complete block design with three replications in stress field in Kouhdasht city. Results of analysis of variance showed that the response of the studied genotypes was different for grain yield and the possibility of selection of genotypes based on each of the traits. Comparison of numerical values ​​and rank of each genotype according to drought tolerance indices showed that based on drought tolerance indices according to seed yield of genotypes 1 (Omrab3), 2 (Hana) and 3 (Aria (stork) as drought tolerant and genotypes, Other genotypes were identified as susceptible genotypes. The results of correlation coefficients between indices showed that MP, GMP, HAM, STI indices had positive and significant correlation at 1% probability level with grain yield in stress and non-stress conditions. There were some, so it can be said that these indices are the best indices for identifying superior genotypes. Principal component analysis results showed that the first two components accounted for about 99% of the data variation. According to Gabriel's biplot chart, the studied genotypes were classified into two high yield potential and low yield potential areas, with genotypes 1 (Omrab3), 2 (Hana) and 3 (Aria (stork) being adjacent to vectors. Drought tolerance was identified as superior genotypes. Cluster analysis based on superior indices separated the studied genotypes into three general groups, which were in good agreement with the results of Gabriel biplot plotting.

Canola (Brassica napus L.) is one of the most important world's oilseed crops. The salin soils and salinity is the most important environmental stress factor that affects production of rapeseed. In order to study salinity resistance in canola cultivars at seedling stage based on morphophisiyological traits and assessing relation of these traits with ISSR markers, 15 canola cultivars in two salinity stress levels (150 mM and 250 mM) and non stress condition (control) were studied at greenhouse condition as hydroponic culture method. In this study, salinity stress caused decreasing of all evaluated morphophisiyological traits, except Na to K ratio and Na content. Results of mean comparisons and classification by cluster analysis of cultivars in different conditions showed that the SLMO46 and PF were better than other cultivars in all traits,was superior for average of most traits. So, the Hyolla60 and Licord cultivars in all traits had lower amounts. In Molecular analysis using 11 ISSR primers, 45 polymorphic bands produced in studied canola cultivars. Means of Polymorphic Information Content and Marker Index for all primers were obtained 0.282 and 1.108, respectively. In cluster analysis using ISSR data and Nei`s genetic distanceand UPGMA method, the canola cuhtivars classified in three clusters. The minimum genetics distance obtained between Zarfam and Jevel cultivars (0.079) and the maximum distance observed between Quantum and Hyola60 whit SLMO46 cultivars (0.32).