Evaluation of wheat cultivar storage by two methods weighing and content of WSC (water soluble carbohydrates) and its relationship with remobilization

Water deficit, especially after heading, is one of the reduction factors of wheat yield in Iran. Considering that, studding the physiological traits related with terminal drought stress tolerance, could help to identify tolerant cultivars. The aim of this study were to evaluate the variation in accumulation and its relationship with remobilization of some wheat cultivars in Iran, so a split-plot experiment based on randomized complete block design with three replications was conducted at the research farm of agriculture faculty of Tehran University in 2015-16. Factors were considered irrigation in two levels (full irrigation and 40% of field capacity) as main plot and 22 cultivars of wheat as sub plot. The amount of accumulation and remobilization was estimated by weighting and evaluation of soluble carbohydrates content was determined. Significant genotypic variations among cultivars for these traits observed under both conditions. Maximum accumulation by dry weight measurement, on average, was found in lower internodes followed by peduncle and penultimate. But in WSC measurement, maximum accumulation was observed in penultimate followed by lower internodes and peduncle. Cultivar’s ranking based on accumulation was also different in tow methods. Drought stress caused reduction of internodes weight, soluble carbohydrates content and yield. Release of dry matter from internodes was decreased by drought stress in some cases, but in other cases the reverse trend was found. Among the related traits with accumulation, the specific stem weight had the highest correlation with remobilization. Correlation among remobilization, the specific stem weight and WSC with yield was positive and significant.