Studies on heritability and genetic variability for grain physical properties in Malaysian rice germplasm

Abstract

Genetic based information of different traits plays important role in varietal improvement of rice. Twenty rice accessions (Oryza sativa L.) obtained from National Rice Gene Bank were evaluated during main season 2015/2016 to estimate heritability, genetic variability and genetic advance for seven grain physical properties. Among the traits, milled grain length/width ratio, milled grain length, milled grain length after cooking and grain length exhibited high estimates of phenotypic coefficient of variation (PCV), and genotypic coefficient of variation (GCV). Highest broad sense heritability and genetic advance was obtained for grain length (98.66% and 62.25%), milled grain length (98.95% and 67.31%), milled grain length/width ratio (98.50% and 80.41%) and milled grain length after cooking (98.93% and 65.44%) which suggest these traits are most probably controlled by additive gene action and hence they can be fixed by selection. However, kernel elongation ratio showed lowest value of broad sense heritability and genetic advance (11.76% and 1.38%, respectively) and may suggest non-additive gene action in their inheritance and selection of this trait may difficult due to high environmental influences. Therefore, improvement of high quality rice with kernel elongation ability may require molecular marker application as it is highly affected by environment for precise selection.

Genetic Studies for Selected Agronomic Traits in 19 Maintainer Genotypes of Rice (Oryza sativa L.)

“…The highest heritability was observed in the DFF trait (97.60%), followed by GWD (80.42%), and GLT (79.78%). Similar results on high H 2 in DFF trait were reported [20;36-41] and high H 2 in GLT and GWD traits were reported by several authors [42][43][44][45][46][47]. High heritability and genetic advance may indicate the role of additive gene action governing a trait.…”

Estimation of Genetic Variability Parameters for Various Yield Attributing Traits in Germplasm Collection of Rice (Oryza sativa L.)

“…To identify a trait's response to phenotypic selection, heritability is crucial. For a breeding programme to be successful, improving quantitative traits in plants requires accurate heritability estimation [24]. The estimates of genetic advance expressed as a percentage of the mean offer greater confidence about the efficacy of selection in enhancing the traits.…”

Variability, heritability, and performance of 28 West Sumatran upland rice cultivars, Indonesia

“…The value of variability and the estimated heritability are essential components that must be measured before determining the method and time for selection (Mustikarini et al 2019). The coefficient of genotypic variation (GCV) and the coefficient of phenotypic variation (PCV) are very useful in determining the amount of diversity that exists in the population and are the basis for variability criteria (Mustikarini et al 2019;Saidon et al 2020). All traits showed high PCV than GCV, similar to the results reported by Srivastava et al (2017); Tiruneh et al (2021), indicating that the variance observed for the traits was more influenced by the genetic factors and suitable environment support the expression of genetic (Kartahadimaja et al 2021).…”