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International Journal of Bio-resource and Stress Management
Year : 2010, Volume : 1, Issue : 1
First page : ( 48) Last page : ( 50)
Print ISSN : 0976-3988. Online ISSN : 0976-4038.

Genetic Analysis for Yield Components and Yield in Rice (Oryza sativa L.)

Chaturvedi H. P.1,*, Talukdar P.2, Changkija Sapu1

1Department of Genetics and Plant Breeding, SASRD, Nagaland University, Nagaland (797 106), India

2Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat, Assam, India

*Correspondence to E-mail: hpchaturvedi@yahoo.co.in

Online published on 31 March, 2014.

Abstract

Component analysis indicated importance of both additive and dominance gene action for the characters days to 50% flowering, 50% flowering to maturity, plant height, panicle length, grain filling percentage and length-breadth ratio, while only the dominance component was important for the characters like effective tillers per plant, panicle weight, grains panicle−1, 1000 grains weight and yield plant−1. Dominant genes were more frequent in the parents than the recessive genes for the characters days to 50% flowering, 50% flowering to maturity, plant height, panicle length and length-breadth ratio. Unequal gene frequencies for positive and negative alleles in the parents were observed for all the characters except grains panicle−1 for which equal gene frequencies were evident. The estimates of degree of dominance were more than unity for all the characters including yield plant−1, which indicated prevalence of over-dominance.

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Keywords

Diallel, gene action, rice.

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