Indian Society of Genetics & Plant Breeding

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SELECTION RESPONSES FOR GRAIN WEIGHT IN SOME MASS SELECTED AND INTERMATED POPULATIONS OF WHEAT (TRITICUM AESTIVUM L.)

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Mechanical mass selection for grain size, followed by two cycles of intermating among the
high grain-weight populations, was done to achieve improvement in grain yield. Forty
progenies each from five mass selected, eight populations of the first and four of the second
intermating cycles were evaluated for plant height, number of grains/spike, l000-grain
weight, and grain yield. Mechanical mass selection and each cycle of intermating were
effective to increase l000-grain weight, indicating the accumulation of favourable alleles
in the segregates. There was slight improvement in number of grains/spike also in the
progenies of the first intermated populations which pushed up grain yield. However, the
second cycle of intermating was not effective in increasing grain yield due to reduction in
number of grains/spike. Correlation studies also revealed the usefulness of one cycle of
intermating for improving grain yield. Therefore, it is proposed to practice only one cycle
of intermating to achieve optimum expression of yield components.
 

Keywords: Wheat, grain weight, mass selection, intermating, selection response.

Info

Year: 1995
Volume: 55
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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