Diversity in salt tolerant rice genotypes based on multivariate analysis

Forty four salt tolerant genotypes of rice from different geographic regions were used to assess diversity among them by Mahalanobis D2 and principal component analysis (PCA). D2 statistics grouped genotypes into 12 distinct clusters and exhibited maximum intercluster distance between cluster IX and X (144.91) followed by clusters II and X (131.87) and clusters VII and X (126.27). PCA revealed axis 1 and 2 accounted for 82.88% and 11.14% of variance, respectively with positive correlation to number of grains panicle-1. Similar to D2 analysis PCA grouped the genotypes, which have similar phenotypic performance and attain meaningful grouping of genotypes. Both the statistical analysis revealed that genetic diversity was based on pedigree and independent of geographical origin.