Effect of drought stress on some physiological traits and biological yield of different cultivars of mung (Vigna radiate (L.)) in Dezful

This experiment was carried out in cropping years 2010-2011 in Agricultural Research Center of Dezful as split plot in a randomized complete block design with three replications. Treatments consisted of three cultivars of mung bean seeds (Parto, Indian lot and promising line of mung VC61) in subplots And three irrigation levels (no stress, mild stress and severe stress with 120 , 180 and 240 mm from evaporation pan, respectively) were in the main plots. In this investigation, physiological traits including chlorophyll content, stomatal conductance, biological yield and leaf area index were measured. Drought stress had a significant effect in one percent level on chlorophyll content and stomatal conductance, decreasing in chlorophyll content and stomatal conductance in leaves was observed. Also, there was significant difference in cultivars and stomatal conductance was the highest in VC61 cultivar. VC61 cultivar with the 71/71 had the highest SPAD value and the amount of chlorophyll a b VC61 cultivar, Indian and Parto cultivar was 1/364, 1/148 and 1/213, respectively. Drought stress had a significant effect on biological yield and the leaf area index at 5% level. Such as this traits decrease with severity of drought stress.