Studies on Genetic Diversity for Yield and Yield Attributing Traits in Advanced Lines of Rice (Oryza sativa L.)
Mallu Bisanal
Department of Genetics and Plant Breeding, ANGRAU-Agricultural College, Bapatla, Andhra Pradesh, India.
J Dayal Prasad Babu *
Department of Genetics and Plant Breeding, ANGRAU-Regional Agricultural Research Station, Maruteru, West Godavari, Andhra Pradesh, India.
P Vekata Ramana Rao
Department of Genetics and Plant Breeding, ANGRAU-Regional Agricultural Research Station, Maruteru, West Godavari, Andhra Pradesh, India.
ADVSLP Anand Kumar
Department of Entomology, ANGRAU-Regional Agricultural Research Station, Maruteru, West Godavari, Andhra Pradesh, India.
*Author to whom correspondence should be addressed.
Abstract
Investigation was conducted to study genetic diversity among the 48 rice genotypes for eight yield and yield related traits using Mahalanobis D2 analysis. The experimental material were evaluated during kharif 2024 at Regional Agricultural Research Station, Maruteru. Univariate analysis of variance revealed significant differences for the eight characters under study. The 48 advanced lines of rice were grouped into 9 Clusters using Tocher’s method. Cluster I contained the most genotypes (28) and clusters VIII and IX were singleton clusters. The maximum inter-cluster distance was observed between Cluster V and ⅦI (20.1805). Selection of genotypes from these Clusters may serve as potential donors for future hybridization programme to develop recombinants with high yield and desirable traits. Highest mean for test weight and grain yield /plant was reported in Cluster IV and highest mean for no. of ear bearing tillers/m2 and number of filled grains/panicle was reported in cluster V. The traits, number of filled grains/panicle (36.31%) contributed maximum to the genetic divergence and minimum by the panicle length (0.41%).
Keywords: Rice, genetic diversity, intra-cluster and inter-cluster distances, Mahalanobis D2 analysis, Tocher’s method