Correlated response and path analysis in irrigated rice and their implication in selection

Abstract

Abstract : Studies on the correlation, correlated responses and path analysis were conducted on 29 rice genotypes from nine different countries at BRRI, Gazipur during boro season, 1996. Grain yield per plant had significantly positive correlation with plant height, panicle length and filled grain per plant. Panicle per plant showed significantly negative association with grain yield per plant. Maximum correlated response (CR) and relative selection efficiency (RSE) on grain yield per plant were observed through indirect selection for plant height. Panicle length, filled grain per plant and 1000 grain weight showed considerable response and RSE. Negative response to selection with negative RSE was observed through panicle per plant. Pilled grain per plant and 1000 grain weight showed high positive direct effect on grain yield per plant. Panicle per plant showed considerably negative direct effect with grain yield. The indirect effects of plant height and panicle length through filled grain per plant and 1000 grain weight were well pronounced. The study suggested that filled grain per plant, 1000 grain weight and fewer panicles per plant are the most important characters in selecting for genetic improvement of irrigated boro rice.