Variability and path co-efficient for yield and yield components in rice

Abstract

Twenty five rice varieties were evaluated for their variability with regard to yield and yield components. Estimates of heritability and genetic advance as per cent mean were also obtained for the above traits. In addition, studies on character associations and path co-efficients were also undertaken. The results revealed high variability, heritability and genetic advance as per cent mean for productive tillers per plant, number of tillers per plant, number of grains per panicle and number of filled grains per panicle, while days to maturity was recorded with high heritability coupled with low genetic advance as per cent of mean. Further, yield was observed to be positively associated with number of tillers per plant, productive tillers per plant, number of grains per panicle and number of filled grains per panicle. Among these, number of tillers per plant, productive tillers per plant and number of filled grains per panicle were noticed to exert high direct effects on grain yield per plant. High indirect effects of most of the traits were noticed mostly through productive tillers per plant indicating importance of the trait as selection criteria in crop yield improvement programmes.Bangladesh J. Agril. Res. 41(2): 259-271, June 2016

Genetic variability, heritability, correlation and path analyses of yield components in traditional rice (Oryza sativa L.) landraces

“…The high heritability values of the considered traits in the present study indicated that those were less influenced by the environment and thus help in effective selection of the traits based on the phenotypic expression by adopting simple selection method and suggested the scope of genetic improvement. Similar results for 100 seed weight, number of unfilled grains per panicle and number of effective tillers per plant were earlier recorded by Gour et al (2017), Sameera et al (2016) and Sumnath et al (2017) respectively.…”

Genetic Variability Studies in Genetically Diverse Rice Genotypes

“…These results were confirmed with the finding of Rajender et al, (2013) for days to 50% flowering, plant height, Sravan et al, (2012) for days to 50% flowering, number of productive tillers per plant and number of grains per panicle, Sameera et al, (2015) for plant height and panicle length, Pandey et al, (2012) for number of grains per panicle and seed yield per plant. Heritability is a measure of extent of phenotypic variation caused by the action of genes.…”

“…These results were confirmed with the finding of Rajender et al, (2013) for days to 50% flowering, Patel et al, (2014) plant height, Sravan et al, (2012) for number of grains per panicle, Sameera et al, (2015) for number of productive tillers, seed yield per plant. Pandey et al, (2012) for seed yield per plant, Singh et al, (2011) for days to 50% flowering, panicle length and number of grains per panicle.…”

Evaluation of Genetic Variability, Heritability and Genetic Advance for Yield and Yield Components in Rice Genotypes

“…The heritability estimate for this trait was very high (98.9) with high genetic advance as per cent of mean (62.84).The similar results were observed by Mohan et al, (2015) and Sameera et al, (2015)for high GCV and PCV, Karande et al, (2015) for high heritability and for high genetic advance as percent of mean. …”

“…The observed heritability estimate for this trait was high (91.9) while genetic advance as per cent of mean (21.42) were moderate. The results were conformity with Sameera et al, (2015) for moderate GCV and PCV and Gampala et al, (2015) for high heritability and Islam et al, (2015) for moderate genetic advance as percent of mean.…”