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REGULAR ARTICLE
Genetic divergence in lowland rice of north eastern region of India
Pankaj K. Singh, Murli N. Mishra, Dipak K. Hore, Med R. Verma
Communications in Biometry and Crop Science (2006) 1 (1), 35-40.
ABSTRACT
Genetic divergence of 52 traditional lowland rice (Oryza sativa L.) genotypes from five states of North
Eastern Region of India was investigated using Mahalanobis D2 statistic. Based on 15 agro-morphological
characters, these genotypes were grouped into six clusters. Out of 52 genotypes, 26 genotypes were grouped
in cluster I; cluster VI comprised only one genotype. Genotypes from more than one state were grouped in one
cluster, and genotypes from one state were grouped in more than one cluster. Geographical origin was not found
to be a good parameter of genetic divergence. Clusters II, III, and IV exhibited high values for most of the
characters. Plant height, followed by leaf angle and leaf area, highly contributed (32.43%) to the formation of
clusters. Clusters II, IV, and V, which had maximum inter-cluster distances and high values of plant height,
days to 50% flowering, panicle length, grain yield/plant, and milling percent, may be used for initiating a
hybridization programme.
Key Words: genetic variability; cluster analysis;
genetic diversity; inter-cluster distance; crop diversity.
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