Interrelationships among some agronomic traits in mungbean under drought stress and non-stress conditions

Five mungbean genotypes were planted in pots under drought stress and non-stress conditions at the ind ividual garden, Shiraz, Iran using a randomized complete bl ock design with 3 replications in 2010. Initiation of differential irrigation was started at 50% flowering stage and c ontinued through crop maturity. Pots under drought stress were irrigated to FC (Field Capacity) when the weight of each pot reached to 50% of FC. Non-stress pots wer e irrigated every other day. The correlation coefficients are s ignificantly positive between grain yield and root dry weight, root length, pods number plant-1, plant dry weight, pods weight and leaves number under non-stress conditio n. Pod length, leaves number and plant dry weight signific antly positively correlates with grain yield under stress condition. The results of path analysis indicates that direct effect of root dry weight on grain yield is highest and positive under non-stress condition, indicating that direct select ion to improve yield with this trait would be effec tive. Root dry weight has the highest indirect effect on grain yie ld under non-stress condition. Leaves number and pl ant height have the highest positive and negative indirect eff ects on grain yield, respectively under stress cond ition. The highest positive and negative indirect effects on g rain yield also relates to leaves number and plant height, respectively.