Genetic studies in upland rice (Oryza sativa L.)

Abstract

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

Studies on variability, correlation and path coefficient analysis for yield and quality traits in rice (Oryza sativa L.) genotypes

“…This is in accordance with the findings of Chakraborty and Chakraborty (2010) and Yadav et al (2010) for days to flowering, Pavan Shankar et al (2016) for breadth of kernel and amylose content, Rakesh et al (2013) and Edukondalu et al (2017) for percentage of hulling and percentage of milling, Anis et al (2016) for total number of effective tillers per plant, height of the plant and length of panicle. Rahman et al (2014) and Basavaraja et al (2011) for total number of productive tillers per plant, Rahman et al (2014) and Shinde et al (2015) for a positive direct effect of height of the plant on grain yield per plant . Abdus et al (2009) and Menaka et al (2015) for a positive direct effect of filled grain number per panicle on grain yield per plant, Patel et al (2017) for a direct effect of length of panicle on grain yield per plant (Table 5).…”