Evaluation of yield and yield components of different varieties of pinto beans (Phaseolus vulgaris L.) under water stress conditions.

In order to evaluate the yield and yield components of pinto bean varieties (Phaseolus vulgaris L.), under water stress, an experiment was conducted in 2016 in Damavand city in the form of a split plot design based on a randomized complete block design with 3 replications. So that water stress (A), as the main factor, includes three levels: control, mild stress and severe stress and variety (B) was considered as a subfactor, including 6 varieties of pinto beans (Ghaffar, F16, Ks21492, Ks21495, Ks21558 and Ks22102). The traits of number of pods per plant, length of pods, number of seeds per pod, weight of 100 seeds, biological yield, yield of seeds per plant and harvest index were measured and indices of drought stress tolerance were calculated. According to the results of analysis of variance, the effect of water deficit stress was significant on all studied traits, except for the traits of weight of 100 seeds, biological yield. Also, there was a significant difference between the investigated varieties in terms of all the studied traits at the probability level of 1%. The results of comparing the mean treatments showed that Ks 21495 had the highest seed yield with the highest values of the number of pods per plant and the number of seeds per pod. Based on the obtained results, mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HARM) and stress tolerance index (STI) indices were the most appropriate indices for the strain-tolerant varieties.