Indian Society of Genetics & Plant Breeding

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GENETICS OF YIELD DETERMINING FACTORS IN SPRING WHEAT OVER ENVIRONMENTS

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Genetics of yield determining factors was studied in a set of 10 X10 half-diallel progenies
(FI and F2) of spring wheat over three environments. The results of components of variance
analysis pooled over environments revealed that both additive (D) and nonadditive (HI
and H2) components ofvariation were involved in the expression ofalmost all the characters
in FI as well as F2 generations. However, the nonadditive components were higher than
additive component excegt in few cases in FI where the additive component was
preponderant. The {HI/D)I values revealed overdominance for all the characters in both
generations except for days to heading, plant height, peduncle length, spike length and
spikelets per spike in FI, where partial dominance was recorded. The values of F exhibited
excess of dominant alleles for days to heading, days to maturity, spikelets per spike (Ft and
F2) and peduncle length (F2), and directional dominance of the decreasing genes for plant
height and spike length (Fd. Biparental mating and/or diallel selective mating system could
be the best breeding method for more tangible advancement in spring wheat.
 

Keywords: Spring wheat, gene action, components of variance, dominant alleles, yield traits.

Info

Year: 1997
Volume: 57
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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