Genetic variability, correlation and path analysis in the BC2F2 population of groundnut

Rachel  Lissy Vargheese; S. Saravanan; S. Juliet  Hepziba; S.Merina  Prem Kumari; A. Kavitha  Pushpam; M. Arumugam Pillai

doi:10.14719/pst.3282

Authors

Rachel Lissy Vargheese Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University, Coimbatore 641 003, India https://orcid.org/0009-0003-3550-3660
S. Saravanan Rice Research Station, Tamil Nadu Agricultural University, Ambasamudram, Tirunelveli 627 401, India https://orcid.org/0000-0001-6094-4458
S. Juliet Hepziba Department of Genetics and Plant Breeding, V.O.C Agricultural College and Research Institute, Killikulam, Thoothukudi 628 252, India https://orcid.org/0000-0002-7569-740X
S.Merina Prem Kumari Department of Biotechnology, Agricultural College and Research Institute, Madurai 625104, India https://orcid.org/0000-0001-5995-8879
A. Kavitha Pushpam Department of Crop Physiology and Biochemistry, V.O.C Agricultural College and Research Institute, Killikulam, Thoothukudi 628 252, India https://orcid.org/0000-0003-0238-8988
M. Arumugam Pillai Department of Genetics and Plant Breeding, V.O.C Agricultural College and Research Institute, Killikulam, Thoothukudi 628 252, India https://orcid.org/0000-0002-4383-2574

DOI:

https://doi.org/10.14719/pst.3282

Keywords:

Groundnut, backcross, allele specific primers, variability and association

Abstract

The present study was carried out in the backcross population of groundnut involving TMV 7 and ICG 15419. Allele-specific primers were used to screen the population for high oleic acid and a total of 11 yield-contributing traits were included in this study. The number of primary and secondary branches had higher estimates of PCV and GCV whereas pod yield per plant had moderate PCV but low GCV. Along with the variability parameters, plant height, number of primary and secondary branches, pod width, 100 pod weight, oleic acid content and linoleic acid content had good estimates of heritability and genetic advance as a percent of the mean, whereas pod yield per plant had moderate and low, heritability and GAM respectively, with a negatively significant skewed distribution. Association analysis exhibited a positive correlation between the number of primary branches, number of secondary branches, pod length and 100 pod weight with pod yield per plant and it was evident that oleic acid was indirectly proportional to linoleic acid content. Hundred pod weights had the highest direct effect on pod yield per plant. Selection based on traits with a better relationship with pod yield per plant and moderate to high estimates of PCV, GCV, heritability and genetic advancement would help in accelerating the groundnut improvement program. High oleic, low linolenic lines of BC2F2 with better pod yield would be forwarded to the next generation.

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