Effect of drought and heat stress on grain yield and Components yield of wheat genotypes

In order to evaluate the effect of heat stress and water restriction on grain yield and Components yield of wheat cultivars, this experiment was conducted as split plot based on randomized complete block design with four replications at Khuzestan Agricultural Research Center in two years in (2016-2017). Main plots included control cult that planting on recommended and normal conditions, planting was done on recommended dates, and discontinuation of irrigation after pollination and finally planting with a delay of one month from the recommended planting date and having normal and sub plots consisted of 3 wheat genotypes (Chamran2, Aflak and Khalil). The results showed that Drought and heat stress reduced the yield and its components and Grain filling period is heavily influenced by heat stress for all cultivars. In general, Khalil cultivar with superior grain yield (3582 kg / ha) and 1000 grain weight (34.3 g) was superior to other cultivars under stress of water and heat limitations. Grain yield of Chamran 2 variety was significantly reduced in terms of water restriction and heat stress that in this situation it is not recommended. In comparison with other two cultivars, Khalil cultivar with the highest grain yield and 1000-grain weight was more resistant to stress conditions and suitable for cultivation with such conditions is recommended.