Estimation of Heterosis and Inbreeding Depression for Yield and Yield Related Traits in Rice ( Oryza sativa  L.)

S.K. Sharma; S.K. Singh; R. Nandan; Amita Sharma; Ravindra Kumar; V. Kumar; M.K. Singh

Estimation of Heterosis and Inbreeding Depression for Yield and Yield Related Traits in Rice (Oryza sativa L.)

S.K. Sharma

, S.K. Singh

, R. Nandan

, Amita Sharma

, Ravindra Kumar

, V. Kumar

, M.K. Singh

Department of Genetics & Plant Breeding, Institute of Agricultural Sciences Banaras Hindu University, Varanasi (U.P.), 221005, India

Author

Correspondence author
Molecular Plant Breeding, 2013, Vol. 4, No. 29 doi: 10.5376/mpb.2013.04.0029
Received: 09 Jul., 2013 Accepted: 22 Sep., 2013 Published: 25 Sep., 2013

This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Preferred citation for this article:

Sharma et al., Estimation of Heterosis and Inbreeding Depression for Yield and Yield Related Traits in Rice (Oryza sativa L.), Molecular Plant Breeding, Vol.4, No.29 238-246 (doi: 10.5376/mpb.2013.04.0029)

Abstract

The present investigation inrice (Oryza sativa L.) was undertaken for studying the magnitude of heterosis of 48 hybrids (F₁s) made by involving sixteen restorer lines and 3 cytoplasmic male sterile (CMS) lines following line×tester mating design. The result indicated that the magnitude of heterobeltiosis for grain yield was significantly superior in 28 hybrids ranging from 10.85 to 66.35% and only in 2 hybrids (IR58025A×Sarju-52; IR58025A×BPT5204) over the standard hybrid (Arize-6444) with the magnitude of 11.87 and 20.60% respectively. These crosses also exhibited significant heterosis for days to maturity, number of spikelets panicle^-1, number of grains panicle^-1. The most promising combinations (IR58025A×Sarju-52 and IR58025A×BPT5204) for grain yield and other traits need to be tested on larger scale for their commercial values. Besides these, few other crosses viz; Pusa6A×BPT5204, IR68897A×BPT 5204 and Pusa6A×Krishna Hansa expressed more than 40% heterobeltiosis for grain yield alongwith other desirable yield components may be considered for commercial expliotation.

Keywords

Heterosis; Oryza sativa L.; Rice; WA-CMS

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