Genetic Variability and Correlation Studies on Yield and Yield-Related Traits in Rice (Oryza sativa L.) and their Implications in Selection

Author: Kavyashree N.M., J.R. Diwan*, Mahantashivayogayya K., Lokesha R. and Nagaraj M. Naik

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Abstract

Rice being a self pollinated crop suffers from reduced genetic diversity. The low heritability of yield trait is yet another problem in breeding which demands indirect selection via componental traits for its improvement. In this context, study of genetic variability and correlation forms the vital part of rice breeding programs. Twenty four rice genotypes including four popular checks were evaluated in a randomized complete block design with three replications, at Agricultural Research Station Gangavati, University of Agricultural Sciences Raichur, India. The experiment was carried out in Kharif 2018 to study the genetic variability and correlation between yield and yield attributing traits of rice crop. The analysis of variance indicated the presence of significant variability between the genotypes. The higher estimates of genetic parameters viz., Vp and PCV as compared to the respective Vg and GCV revealed the influence of environment in the trait expression for all the characters s

Keywords

Rice; Grain yield per plant; Yield attributing traits; Genetic variability; Correlation.

Conclusion

The Analysis of Variance (ANOVA) indicated the presence of significant differences among the 24 genotypes for all the studied traits. The genetic variability analyses also revealed that the material used in this study possessed significant variability in terms of yield and yield-related attributes, providing a suitable platform to carryout selection by the breeder. Correlation study between the yield and its component characters found that the genotypic correlation coefficients were greater than the phenotypic correlation coefficients in most situations, indicating that the relationship is mostly attributable to genetic factors. In several situations, the phenotypic correlation coefficients were greater than the genotypic correlation coefficients, indicating the significant role of environment in governing the expression of these traits. The strong positive genotypic correlation of grain yield per plant with other yield-related traits like the number of effective tillers per plant, le

References

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How to cite this article

Kavyashree N.M., J.R. Diwan, Mahantashivayogayya K., Lokesha R. and Nagaraj M. Naik (2022). Genetic Variability and Correlation Studies on Yield and Yield-Related Traits in Rice (Oryza sativa L.) and their Implications in Selection. Biological Forum – A