Indian Society of Genetics & Plant Breeding

Realized response to different selection criteria in maize (Zea mays L.)

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Genotypic performance in maize (Zea mays L.), which is
a sensitive crop, is greatly affected by variation in plant
stand and soil heterogeneity particularly, during monsoon
season. In the present study, 229 51 progenies of
'Composite Kesri' were evaluated and modified 51 selection
among these progenies was carried out for high (HY) and
low (LY) grain yield. Experimental varieties were
developed by selecting among 51 progenies on the basis
of analysis of covariance of grain yield for pl3nt stand
and near neighbour (NN) corrections to account for the
effect of soil heterogeneity on gain yield. Further,
experimental varieties were also developed on the basis
of superiority of plot and plant yield of 51 progenies in
comparison to the adjacent row of balanced male (8M)
composite. The objective was to identify the approach
that most favourably affects the response to selection.
The resulting experimental varieties were evaluated in six
environments. Analysis of variance showed significant
differences among experimental varieties and original Kesri
for all the traits studied. Selections were effective for
HY as well as LY. In case of selection for HY, the
experimental varieties developed by selecting on the basis
of plot yield in comparison with 8M composite, gave
numerically, the highest yield followed by the variety
developed on the basis of selection for plot yield corrected
by analysis of covariance for plant stand, and these both
gave significantly higher yield than Kesri. Overall
consideration of direct and correlated response to selection
for HY and LY indicated that selection for yield may be
more effective when based on superiority in plot yield
over adjacent rows of 8M cpmposite.

Keywords: Maize, modified S1 Selection, selection criteria, experimental variety


Year: 2002
Volume: 62
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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