Genetic Association Studies for Yield and Yield Attributes in BC2F2 Population of rice (Oryza sativa L.)

Author: Sowmiya C.A., Arumugam Pillai M., Ramalingam J., Pushpam R., Shoba D. and Kumar K.K.

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Abstract

Yield in rice is a complex trait influenced by multiple genes and environmental factors. This complexity makes it difficult to pinpoint the exact genetic variants responsible for differences in yield. It's essential to carefully control and minimize environmental noise in the phenotype data. The BC2F2 population of ADT43 × RP-Bio-Patho-2 was used for the present experiment. Through genotypic correlation coefficient and path analysis, sixteen quantitative variables from 58 genotypes were evaluated in this study. The genetic correlation between two traits is quantified by the genotypic correlation coefficient. The results of the experiment showed that there is potential to concurrently enhance the number of productive tillers, the number of filled grains per panicle, and the number of grains per panicle features to raise grain yield per plant, as indicated by the significant and positive correlation between the traits. The investigation of the direct and indirect relationships between variables in a complex system is conducted using path coefficient analysis. It facilitates comprehension of the contributions of several factors to the variation in a target variable by dividing the entire effect into its direct and indirect components. Based on path analysis, the number of productive tillers per plant, number of grains per panicle, and number of filled grains per panicle had a significant positive direct impact on grain yield; thus, this characteristic needs to be given top priority during selection.

Keywords

Genotypic correlation coefficient, path analysis, direct effects, indirect effects, significance

Conclusion

The genetic parameters of yield and qualities that contribute to yield were examined in BC2F2 populations of 58 backcross-derived rice genotypes (ADT43 X RP-Bio-Patho-2), recipient parent ADT43, and donor parent RP-Bio-Patho-2. A high degree of positive correlation and a direct positive effect of a number of productive tillers per plant, number of grains per panicle, and number of filled grains per panicle with the grain yield per plant, suggested that this yield-contributing trait could be a selection criterion for improving the yield of the rice genotypes under study. Additionally, kernel length before cooking may be useful selection criteria.

References

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How to cite this article

Sowmiya C.A., Arumugam Pillai M., Ramalingam J., Pushpam R., Shoba D. and Kumar K.K. (2023). Genetic Association Studies for Yield and Yield Attributes in BC2F2 Population of rice (Oryza sativa L.). Biological Forum – An International Journal, 15(10): 221-227.