Estimation of Heterosis and inbreeding Depression for Yield, and its components Traits in rice (Oryza sativa L.)

Author: Rohit Kumar, S.S. Rao, Anjali Manhar, Deepak Gauraha and Sanjay Sharma

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Abstract

The present study entitled was carried out at Research cum-Instructional Farm, Department of Genetics and Plant Breeding, College of Agriculture, IGKV, Raipur Chhattisgarh, India during kharif 2021-22. The experimental material comprised of five generations each cross of pair parents i.e. P1, P2, F1, F2 and F3 of nine different crosses were conducted in Randomized Complete Block Design (RCBD) with three replications during kharif 2022, reprehensively, were used to estimation of heterosis and inbreeding depression for yield and its components traits in rice (Oryza sativa L.). Heterosis of hybrids over mid parent and better parent varied from cross to cross and character to character. IR64 × Vasumati showed the highest heterosis for yield per plant. Among the various hybrids exhibiting desirable value of heterosis, PKVHMT × Tarori Basmati, IR64 × Pusa1121 and MTU1010 x Pusa1121 were top performers for grain yield per plant and negative inbreeding depression for days to fifty per cent flowering showed that hybrid of this crosses flowered earlier than their parents. In case of plant height IR64 × Vasmati, MTU1010 × Pusa1121 and MTU1010 × Tarori Basmati showed significant negative heterosis which indicated the possibility of superior segregating lines for dwarf type.

Keywords

Heterosis, Inbreeding depression, Rice

Conclusion

The findings of present study indicated that majority of the hybrids recorded high heterosis for grain yield per plant. Among the various hybrids exhibiting desirable value of heterosis, PKVHMT × Tarori Basmati, IR64 × Pusa1121 and MTU1010 × Pusa1121 were top performers for grain yield per plant. The hybrid, IR-64 × Vasumati recorded highest heterosis for yield per plant, and was among the best two performers for traits, 100 grain weight and number of grains per panicle. When yield and yield attributing traits were considered IR-64 × Vasumati was the best cross combination. Significant inbreeding depression was recorded for yield and yield attributing traits.

References

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How to cite this article

Rohit Kumar, S.S. Rao, Anjali Manhar, Deepak Gauraha and Sanjay Sharma (2023). Estimation of Heterosis and inbreeding Depression for Yield, and its components Traits in rice (Oryza sativa L.). Biological Forum – An International Journal, 15(8a): 190-196.