Incorporation of rust [Puccinia arachidis] resistance from wild Arachis species into the cultivated groundnut.
1987
Singh A.K. | Moss J.P. | Rao B.G.
On the basis of genomic relationships in section Arachis in the genus Arachis several cytogenetic manipulations were adopted to aid gene transfer from the diploid wild species (2n=20)into the cultivated tetraploid A. hypogaea (2n=40). Triploid hybrids were produced between A. hypogaea and the eight diploid rust-resistant species of section Arachis. Chromosome numbers in these hybrids were doubled to produce hexaploids that were fertile and could be backcrossed with A. hypogaea. Some triploids did produce a few seeds and seedlings; these progenies had varying chromosome numbers (2n=20 to 60) and produced a considerable range of recombinants. Synthetic autotetraploids and amphidiploids were produced from the diploid species. They were then crossed with A. hypogaea. This bridged the ploidy gap between the diploid wild and the tetraploid cultivated species, and increased meiotic recombinations. Backcrossing the resultant hybrids with A.hypogaea with a few intervening selfing generations produced a large number of A. hypogaea-like interspecific derivatives. Screening these derivatives identified segregants incorporating genes from the wild species A. cardenasii, A. batizocoi, A. duranensis, and A. species GKP 10038 that confer resistance to rust.
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