Genetic Divergence Analysis of Panicle Characters of Aman Rice (Oryza sativa L.)

摘要

MOST of the studies on genetic diversity in rice have been carried out on grain yield and its attributing traits ; only a few studies are carried on grain quality or panicle characters (Ghauhan and Singh, 2003 ; Roy et al, 2004). In this context genetic divergence was estimated from 25 aman rice (Oryza sativa L.) cultivars on 13 panicle characters with a view to understand the nature and extent of genetic divergence and to identify genetically diverse parents for a successful hybridization programme.The material for the present study consisted of 25 aman rice cultivars collected from four districts of West Bengal and three check varieties (Table I). The 25 cultivars were grown in RBD with three replications using single seedling per hill during 2003 wet season at experimental field Bidhan Chandra Krishi Viswavidyalaya. Each cultivar was sown in five rows of one meter length, with spacing of 20 cm between the rows and 15 cm between the plants. Observations were recorded on ten random plants -of each cultivar and in.each replication for 13 characters (Table IV). High density grains (specific gravity > 1.20) were estimated following Rao et al. (1985). The mean values of the characters were used to estimate genetic distance following Mahalanobis D2 statistics as described by Singh and Chowdhury (1977). Grouping of cultivars into various clusters were carried out following Tocher's memthod (Rao, 1952).