The Effect of Deficit Irrigation on Yield and Physiological Traits of Bean Cultivars

Drought is a serious problem for production of crops such as bean which is sensitive to this stress. In order to evaluate the effect of drought stress levels on physiological traits on bean cultivars, a factorial experiment in completely randomized design with three drought stress levels including after podding i.e. full irrigation as the control, slight water stress (30% water depletion of filed capacity) and intensive water stress (70% water depletion of field capacity) and four cultivars including White (Radan), Red (Azarshahr), Green (Sanray) and Pinto (Saman) was conducted in green house at faculty of agriculture, Gonbad Kavoos University, in mid-March 2014. In this experiment the traits of seed weight, grain yield, chlorophyll, prolein, protein and phenol were measured. The results showed that drought stress of last growing season was significant on all studied traits. Comparison means of cultivars in control level showed that the lowest (0.66mg/g) and the highest (2.20mg/g) chlorophyll amount were observed in Red and White bean, respectively, while the lowest amount of this trait in slight and intensive stress belonged to Pinto bean with 0.60 and 0.65mg/g, respectively. Total protein amount was higher in stress condition; the highest amount belonged to Green bean (42.91mg/g). The highest prolein amount in slight and intensive stress was observed in White bean with 90.08 and 10.51, respectively. The highest and the lowest seed yield were obtained in White and Pinto beans during intensive respectively.