Genetic Variability and Inter Relationship between Yield and Yield Components in Some Rice Genotypes

Abstract

farm during the season 2009/10 to study genetic variability and correlation between yields, yield components in some rice genotypes. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Seven characters were measured including yield, yield components. Phenotypic ( 2 p h δ ) and genotypic ( 2 g δ) variances, phenotypic (PCV) % and genotypic (GCV) %, coefficients of variation were estimated. Phenotypic and genotypic correlation between characters was determined. The results showed that there were highly significant differences (p≤0.01) between the most of the characters under study except for percentage of unfilled grains per panicle (%). The highest values of phenotypic and genotypic variance were recorded by yield kgha -1 Also grain yield was attained the highest values of phenotypic and genotypic coefficients of variation. Positive phenotypic and genotypic correlation coefficient was detected between grain yield and number of filled grains per panicle, harvest index, panicle length and number of grains per panicle. The present study revealed that there was highly genetic variability among the tested genotypes, indicating that it could be used for further improvement in rice breeding.

Genetic Variability, Heritability and Genetic Advance for Yield and its Related Traits in Rainfed Lowland Rice (Oryza sativa L.) Genotypes at Fogera and Pawe, Ethiopia

“…Similar report noticed earlier by many researchers [29,34] in rice. However, the narrow magnitude of difference between phenotypic and genotypic coefficients of variations were recorded for characters such as days to maturity, plant height, biomass yield, culm length and panicle length indicating limited influence of environment in the expression of these characters.…”

“…Similar results were also reported by other investigators [14,35,36] for number of fertile tillers per plant. Akinwale et al [34] reported low heritability for 1000 grain weight. In contrary, Fentie et al [14] and Osman et al reported high broad sense heritability for 1000 grain weight.…”

Genetic variation and heritability of yield and related traits in promising rice genotypes (Oryza sativa L.)

“…The relationship between rice yield and yield component traits has been studied widely at a phenotypic level. Idris et al (2012) observed positive phenotypic and genotypic correlation coefficient between grain yield and number of filled grains per panicle, harvest index, panicle length and number of grains per panicle. Sadeghi (2011) observed positive significant association of grain yield with grains per panicle, days to maturity, number of productive tillers and days to flowering.…”

Traits association and path coefficient analysis of yield and related traits in rainfed lowland rice (Oryza sativa L.) genotypes in North Western Ethiopia

“…Knowledge on association of crop trait for yield with other related traits are essential to the breeder for making crop improvement in a complex quantitative trait such as yield and for which trait direct selection is not much effective. Hence, association analysis is important for determining the direction of selection and number of traits to be considered in improving grain yield (Idris et al, 2012). Path coefficient analysis is a standardized partial regression coefficient and as such measures the direct and indirect effect for one variable upon another and permits the separation of the correlation coefficient into components of direct and indirect effect (Dewey and Lu, 1959).…”