Find in Library

Studies on genetic variability, character association and path-coefficient analysis were conducted on forty seven (47) ricegenotypes including thirty three hybrids and fourteen parents for grain yield and some physiological traits. Analysis of variancerevealed considerable variability among the genotypes for all the characters. A high genotypic and phenotypic coefficient ofvariation was observed for grain yield per plant, harvest index, pollen fertility (%) and spikelet fertility (%). Characters likepollen fertility (%), spikelet fertility (%), days to 50% flowering and grain yield per plant showed high value of heritabilitycoupled with high genetic advance. Spikelet fertility (%) and harvest index showed positive and significant correlation with seedyield per plant both at genotypic and phenotypic levels. Results of path-coefficient analysis revealed that productive tillers perplant had the highest positive direct effect on grain yield followed by harvest index, spikelet fertility (%), pollen fertility (%) andplant height. The study revealed that genetic improvement of grain yield in rice is admissible by selecting characters having highpositive correlation and positive direct effect.