Indian Society of Genetics & Plant Breeding

Important

EFFECT OF SELECTION ON THE COMPONENTS OF GENETIC VARIABILITY FOR GRAIN YIELD AND ITS COMPONENTS UNDER TWO PLANT DENSITIES IN MAIZE (ZEA MAYS L.)

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Using the NC I design crossing system, full-sib and half-sib families were developed in th~
original and selected populations of the maize composite Vijay. The progenies from each
population were grown under low and high plant densities (53,200 and 88,850 plants/ha,
respectively) and the genetic parameters for grain yield and its components estimated
separately as well as pooled under two densities. The selected population of Vijay
registered 16.3% gain in the grain yield over the original one in the pooled analysis.
Nonsignificant differences between the estimates of oi in original and selected
populations for grain yield indicated that selection had not brought about any change in
additive genetic variability for this trait. In general, the estimates of cri were relatively
lower under high plant density for majority of characters, thus showing that genetic
advance selection would be lower under high plant density than under low density. The
expected genetic gain in the selected population, but as there was no significant change in
the components of genetic variance, therefore, continued response to selection can be
expected. Selection under normal plant population is expected to be more efficient as high
plant density led reduction of additive variance.
 

Keywords: Selection, genetic variance, components, NC design I, Z. mays

Info

Year: 1996
Volume: 56
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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