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HETEROSIS IN INTERSPECIFIC COTTON HYBRIDS
BALOCH MJ,
LAKHO AR,
SOOMRO AH
Abstract: Both F1 and F2
hybrids of cotton manifested considerable amount of heterosis against
the parents. The F2 hybrids which produce more quantity of seed as
compared to F1 may be considered for hybrid cotton production. The
average heterosis of F2s over the parents recorded was 16.44% in yield,
9.68% in bolls/plant, 16.21% in seed index, 1.34% in lint and 3.45% in
staple length. In all the crosses, observed inbreeding depression was
greater than what was expected based on coefficient of inbreeding. The
discrepancy between the observed and expected depression could be due to
factors like linkage disequilibrium, epistasis and ploidy level.
Cotton Research Institute, Sakrand, Sindh,
Pakistan
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