Various irrigation cycles effect on grain yield, proline and adaptive metabolits in some wheat genotypes

Drought stress globally affects the growth and production of plants. Wheat is an important crop whose research in this aspect is highly noticeable related to food quality. In recent study, the effects of two different irrigation cycles (weekly (control) and 15-day irrigation) on leaf proline, carbohydrate, N, P, K accumulation and grain yield of three wheat genotypes (Chamran, Dehdasht and Kohdasht) were evaluated at the field of Agriculture Research Station of Borazjan, Bushehr state, Iran, during 2011-2012 growing season. Experimental design was split plot based on randomized complete block design in three replications. The results demonstrated that different irrigation cycles and wheat genotype effects were significant on leaf proline, carbohydrate, K leaf accumulation and grain yield. This finding suggested that Dehdasht genotype could be considered as more resistance genotype against drought condition than Kohdasht and Chamran genotypes. In arid condition which water is limited and dry land farming is necessary, Kohdasht could be selected as a tolerance genotype to water deficiency. Accumulation of proline and carbohydrates was also considered as osmotic adjustment in response to drought stress condition.