Indian Society of Genetics & Plant Breeding

Impact of mating systems on genetic variability in segregating generations of Asiatic cotton (Gossypium Sp.)

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The impact of mating systems in generation of variability
in an intra and interspecific cross of Asiatic cotton
(Gossypium sp.) were studied and compared in F4
generation. Both intra and interspecific crosses exhibited
variable response specific to character and the mating
system used to advance the generations. Reduced
variability observed in the intra-specific cross for some
of the characters in the populations advanced through
random intermating and open pollination as compared to
self pollination could be attributed to linkage
disequilibrium. On the contrary, reverse trend was observed
in the inter-specific cross where open pollination and
selective intermating showed higher genetic variability as
compared to self pollinated population. Significant changes
in character association were observed in F4 population
of both intra and inter-specific crosses following three
mating systems. Such changes are expected if linkages
are broken due to recombination. Population raised through
selective intermating in the intra-specific cross offered
good scope to release a wider range of transgressive
segregants over the other two mating systems while self
and open pollination provided similar advantage in the
inter-specific cross.

Keywords: Asiatic cotton, mating systems, linkage disequilibrium, transgressive segregation


Year: 2003
Volume: 63
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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