Studying the Response of Some White Varieties of Common Bean to Limited Irrigation

In order to study the effects of water stress on different traits of common bean, thirty white lines bean were studied based on randomized complete block design under two water stress and non stress conditions، Analysis of variance for most traits showed significant differences among genotypes، Most traits were affected by the stress، Stepwise regression analysis showed that in white genotypes under water stress conditions, pod weight, harvest index, 100 seed weight and number of seed per plant and under non stress conditions pod weight, harvest index and biological yield have the highest effect on seed yield، Factor analysis was performed for white genotypes both in water stress and non stress conditions and in all conditions three common factor have been extracted, which describe most of traits variations، In order to identify tolerant genotypes, drought resistance attributes were calculated، Mean productivity (MP), Geometric Mean Productivity (GMP) and Stress Tolerance Index (STI) were identified as the best drought resistance indexes، Also by using biplot display for red genotypes separately, white genotypes number 21 and 30 were selected as resistant lines.