Assessment of Genetic Variability, Correlation and Path Coefficient Analysis in Backcross Derived Oat Breeding Lines

Author: Khushbu, V.K. Sood and Sanjay Kumar Sanadya

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Abstract

Genetic variation is a prerequisite for selection of desirable plants in any crop improvement. An experiment was carried out to study the genetic variability parameters and correlation and path analysis in 39 backcrossed-derived oat lines along with parents during winter season 2022-23 in augmented design. Analysis of variance showed significant men square due to genotypes indicating sufficient genetic variation for seed yield and component traits. The genetic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) ranged from 2.61% for days to 75% maturity to 12.61% for harvest index. The studied traits had low to high genotypic and phenotypic coefficient of variation in backcross derived oat breeding lines. Genotypes exhibited high heritability coupled with genetic advance as percent of the mean for seed yield per plant, harvest index, 100-seed weight, leaves per plant and tillers per plant. Seed yield per se performance revealed three lines G10 (HJ-8-80-39-47-44), G16 (HJ-8-80-28-55-64) and G17 (HJ-8-80-36-78-67) that exhibited superiority over recurrent parent HJ-8. Seed yield per plant showed a positive association with days to 50 % flowering, plant height, tillers per plant, leaves per plant, harvest index and 100-seed weight. Surprising, 100-seed weight showed positive significant associations with all the tested characters. Harvest index showed the direct effect with seed yield per plant. There was adequate genetic variability in the tested breeding genotypes to support oat breeding for improved seed yield through direct selection for harvest index and indirect selection for tillers, leaves and 100-seed weight. MABB is the speedy breeding of plants for the disease resistance in 2-3 generations rather than the traditional backcross breeding requires 7 to 8 generations.

Keywords

Variability, Correlation, Path analysis, Selection, Direct effects

Conclusion

The traits had genotypic and phenotypic coefficient of variation from low to high in backcross derived oat breeding lines. Among studied lines, three lines namely HJ-8-80-39-47-44, HJ-8-80-28-55-64 and HJ-8-80-36-78-67 exhibited superiority over recurrent parent HJ-8. Genotypes exhibited high heritability coupled with genetic advance as percent of the mean for seed yield per plant, harvest index, 100-seed weight, leaves per plant and tillers per plant, indicating selection may be effective for these traits. Partitioning of correlation showed that only harvest index, tillers per plant, leaves per plant and 100-seed weight could produce significant correlation with seed yield per which might be either due to very high direct or indirect effects. Hence, selection for these traits could bring improvement in yield and yield components.

References

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How to cite this article

Khushbu, V.K. Sood and Sanjay Kumar Sanadya (2023). Assessment of Genetic Variability, Correlation and Path Coefficient Analysis in Backcross Derived Oat Breeding Lines. Biological Forum – An International Journal, 15(10): 866-870.