Evaluation of bread wheat cultivars for chilling stress tolerance and their effective traits for higher grain yield.

摘要

In this study, five cultivars Alvand, Omid, Shahriaar, Gascogene and Dyson, two local cultivars Sorkheh and Sepid, and three lines C-80-4, C-81-4 and C-81-14 were compared using a randomized complete block design with three replications. Evaluated traits were number of days to spike producing and physiological ripening, grain filling period, grain yield, biomass, harvest index, plant height, 1000-grain weight, number of grains per spike and spike length. Analysis of variances showed that differences between cultivars and lines were highly significant for all traits except number of days to spike producing and straw yield. The highest and the lowest grain yield belonged to cultivars Gascogene and local cultivar Sorkheh, respectively (7730 and 3397 kg/ha). Cultivars Gascogene and Dyson showed more tolerance to coldness. Altogether, cultivars Gascogene and Alvand can be recommended in cold regions.