Gentic Diversity Analysis in Mungbean [Vigna radiata (L.)Wilczek] Under Water Stress

A Pot experiment was conducted with fifty mungbean genotypes under a rain-out shelter at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during March to May 2005 to analyse the genetic diversity in mungbean under water stress condition. Water stress was imposed throughout the growing period by withholding irrigation and by re-watering with water of 50% field capacity at each wilting. Ten relative plant characters of water stressed plants were subjected to multivariate analysis and k-means clustering. The first and second principal components (PC) accounted for 43% and 29% of the total variations, respectively. The genotypes were grouped into four clusters by cluster analysis-clusters I (2 genotypes), IV (1 genotype), III (43 genotypes) and III (4 genotypes). These genotypes were considered tolerant, moderately tolerant, moderately susceptible and susceptible to water stress, respectively. D² analysis revealed significant differences among clusters. Discriminant function analysis (DFA) identified the misclassified genotypes that were reassigned to appropriate group and it was obvious that 75% to 100% genotypes were correctly assigned to the clusters. Overall analusis revealed applicability of multivariate analysis in abiotic stress resistance breeding programme in mungbean