Genetic studies in upland rice (Oryza sativa L.)

Abstract

Studies on genetic variability, character association and path co-efficient analysis were conducted on 40 rice genotypes. Analysis of\rvariance revealed considerable variability among the genotypes for all the characters. A high genotypic and phenotypic co-efficient of\rvariation was observed for grain yield per plant, straw yield per plant, productive tillers per plant, spikelets per panicle, harvest\rindex, 1000 grain weight, number of panicles per running meter, spikelet fertility, plant height, days to 50 per cent flowering and\rpanicle length. Spikelets per panicle showed the highest broad sense heritability (95.81%). Grain yield per plant showed high value\rof heritability coupled with low genetic advance. The genotypic correlations among the yield traits and their path co-efficient were\restimated. The grain yield per plant showed significant positive correlation with harvest index, 1000 grain weight, straw yield per\rplant, plant height and productive tillers per plant. The traits days to maturity, plant height, straw yield per plant and harvest index\rhad moderate to high positive direct effect on grain yield per plant. The study revealed that genetic improvement of grain yield in rice\ris admissible by selecting characters having high positive correlation and positive direct effect.