Studies on genetic diversity in rice TGMS lines

Abstract

One hundred and nineteen rice temperature sensitive genetic male sterile lines (TGMS) were used to study the magnitude of genetic diversity for ten yield traits using Mahalanobis D2 analysis. Based on Torcher’s cluster analysis, the 119 genotypes were grouped into nine clusters. Cluster I was maximum with 85 genotypes followed by cluster II with 15 genotypes and cluster III with 11 genotypes,. The clusters namely IV, VI, VII, VIII, and IX were solitary clusters with one genotype each. The maximum inter cluster distance was observed with clusters V and IX followed by cluster V and VIII which indicates the genotypes present in these cluster having more divergence. The highest intra cluster distance was observed in cluster III (22.08). Among the traits, number of grains per panicle (49.76 %) followed by number of productive tillers (23.43%), spikelet fertility (14.46%) and pollen fertility (9.93%) exhibited maximum contribution towards total divergence among the genotypes studied. Hence, these characters could be given importance for selection of genotypes for further crop improvement program.

Keywords

• genetic diversity
• rice
• temperature sensitive genetic male sterility.