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Triticeae Genomics and Genetics 2014, Vol.5, No.1, 1-6
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The dominance (h) and dominance × dominance (l)
effects were in the opposite direction indicating
predominantly dispersed alleles at the interacting loci
and suggesting that duplicate – type epistasis
( D
#
) ,reported by Jinks J. L.(1958) occurred in most
cases. In cross, DL88 × K560 for days to maturity and
grain yield/plant, cross RD2552 × NDB 1020 for
length of main spike were observed with
complementary epistasis (C
@
). This suggested the
possibility of considerable amount of heterosis in
these two crosses for days to maturity, grain
yield/plant and 1000-grain weight. On the basis of
present study, it could be concluded that grain
yield/plant and the component characters like days to
ear emergence, , no. of effective tillers/plant, , days to
maturity, weight of grains/main spike, no. of grains/
spike, 1000-grain weight were mainly under the
control of non-additive gene action viz ., dominance
(h) gene action and dominance × dominance (l) gene
interaction which indicated their poor amenability to
simple selection procedure, under such a situation,
maximum gain could be achieved by maintaining
considerable hetrozygosity through inter-mating of
selected plant in early segregating generation or by
fallowing some form of recurrent selection reported
by Parlevliet J.E. and Van O.A (1988). This will
increase the possibility of various recombinants,
which may result in accumulation of favorable genes
in the ultimate homozygous line with higher grain
yield. Therefore, few cycles of recurrent selection
followed by pedigree breeding will be effective in the
improvement of 1000-grain /plant in barley.
References
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Newsletter, 18 (2): 21-25