Drought Resistance Identification of Mungbean Germplasm Resources at Seedlings Stage

Abstract

It is significant to identify and screen drought resistant mungbean germplasm resources at seedling stage for mungbean cultivars improvement and production in China, at same time, which could provide some reference methods and basic information for developing the technical specification of identification and evaluation for drought resistance in mungbean. The indices including survival rate of seedlings, wilt index, plant height, weight of fresh and dry leaf, relative water content, biomass weight and stress index were measured with method of repeat drought stress in 70 accessions of mungbean resources. The survival rate of seedlings had significantly positive correlation between first and second drought stress, both wilt index and plant height had significantly negative correlation with survival rate. The survival rate of seedling under first drought stress, wilt index and plant height were selected as suitable indices for drought resistance identification and evaluation based on correlation analysis. The various resistant accessions of mungbean germplasm resources screened by subordinative function analysis included 16 highly resistant, 20 resistant, 23 moderately resistant, eight susceptible and three highly susceptible. The drought resistance was evaluated based on survival rate of seedling under first drought stress, wilt index and plant height with concordance rate of 70.0%, 58.6%, and 51.4% respectively as compared to comprehensive evaluation. The survival rate of seedling under first drought stress was recommended as a drought resistance index in screening a large number of germplasm resources ofmungbean.