Indian Journal of Genetics and Plant Breeding (The)
Year : 1981, Volume : 41, Issue : 1
First page : ( 25) Last page : ( 29)
Print ISSN : 0019-5200. Online ISSN : 0975-6906.

Gene effects in sorghum *

Indi S. K., Goud J. V.

Department of Agricultural Botany, College of Agriculture, Dharwad, 580004, India

*Part of the thesis submitted by the first author to the University of Agricultm-al Sciences, Bangalore for the partial fulfilment of the M.Sc. (Agri) Degree in 1978.

Summary

In a study of five generation set (P₁, P₂, F₁, F₂ and F₃) of three crosses, gene action for eleven quantitative characters were worked out following five parameter model of Hayman (1958). Among the components of generation means the predominance of additive (d’) gene action was noticed for days to 50 per cent flowering and leaf length in IS-3691 × 148 and 148 × A₁, crosses, for plant height, number of leaves and ear length in IS-3691 × 148 and IS-3691 × A₁ crosses, for leaf breadth in IS-3691 × 148 cross for number of whorls in IS-3691 × A₁, cross and for ear breadth in IS-3691 × A₁ and 148 × A₁, crosses. Preponderance of dominance (h) gene action was noticed for all the remaining characters in all the crosses. None of the crosses shewed predominance of additive (d’) gene action for number of primaries, ear weight and grain yield. In addition to additive and/or dominance gene action epistatic gene effect was also of considerable importance. Since grain yield and its components were predominantly under the control of dominance gene effect exploitation of hybrid vigour seems to be fruitful.

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