Indian Society of Genetics & Plant Breeding

Meiotic study of three synthesized tetraploid groundnut

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Closely related wild relatives (diploid) of groundnut
(Arachis hypogaea L.), a (tetraploid), have broad based
resistance to a range of diseases and pests. Direct crosses
between diploid relatives and tetraploid groundnut gives
rise to undesirable triploids. There are no tetraploid
relatives (except A.monticold) which can be easily crossed
to transfer desirable traits. Hence amphidiploids were
synthesized by combining A and B genome of Arachis
species and the autotetraploid was synthesized by
combining two B genome species. Diploid and tetraploid
hybrids were cytologically analyzed to study the
relationship between the chromosomes/genomes of the
parents. The study showed that in the diploid hybrids,
pollen fertility varied but in the tetraploids there was good
recombination between the parental genomes resulting
in high pollen fertility.

Keywords: Arachis species, amphidiploid, autotetraploid, meiosis, recombination, pollen fertility.


Year: 2012
Volume: 72
Issue: 3
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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