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
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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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