Heterosis and inbreeding depression for yield and its components traits in barley (Hordeum vulgare)

R S RAIKWAR

doi:10.56093/ijas.v90i2.99007

Authors

R S RAIKWAR Scientist, Plant Genetics and Breeding, Jawaharlal Nehru Krishi Vishwa Vidyalaya, College of Agriculture Tikamgarh, Madhya Pradesh, India

https://doi.org/10.56093/ijas.v90i2.99007

Keywords:

Heterosis over standard parent, Heterosis over better-parent, Inbreeding depression

Abstract

Heterosis and inbreeding depression was analysed using a set of diallel crosses involving 10 diverse parents (excluding reciprocals). Heterosis over standard parent for grain yield per plant ranged from -9.65–45.45 (%) and -14.78–12.05 (%) under normal and late sown conditions, respectively and heterosis over better-parent for grain yield per plant ranged from -26.43–70.77(%) and -32.16–12.05(%) respectively. Nature and magnitude of heterosis and inbreeding depression varied across crosses, characters as well as environments. Considering the very high degree of heterosis in desirable direction, the importance of non-additive components of genetic variance was observed for yield and most of the yield contributing components. Cross II (K 603 × Azad) and cross IV (RD 2618 × PL 708) revealed better specific cross combinations to be used for heterosis. The study revealed good scope for commercial exploitation of heterosis as well as isolation of pure lines among the progenies of heterotic F₁ for improvement of yield levels in barley.

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