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Introgression of disease resistance genes from Arachis kempff‐mercadoi into cultivated groundnut
Author(s) -
Mallikarju.,
Pande S.,
Jadhav D. R.,
Sastri D. C.,
Rao J. N.
Publication year - 2004
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2004.01036.x
Subject(s) - arachis hypogaea , biology , arachis , leaf spot , introgression , spodoptera litura , hybrid , cultivar , genome , botany , plant disease resistance , pest analysis , gene , lepidoptera genitalia , genetics
Arachis kempff‐mercadoi is a wild species from the section Arachis . All kempff‐mercadoi accessions originate from the Santa Cruz province of Bolivia and they represent Arachis species with the A genome. From molecular analysis it was found that although cultivated A. hypogaea is made up of A and B genomes, A. kempff‐mercadoi may not be as closely related to it as are some of the other A genome species. Arachis kempff‐mercadoi is of interest because it has multiple disease resistance. It was crossed with a Spanish A. hypogaea cultivar which is susceptible to foliar diseases and to the insect pest Spodoptera litura . The success rate of the cross A. hypogaea (2n = 40) × A. kempff‐mercadoi (2n = 20) was very low, but it could be increased by culturing immature seeds in vitro . Although the hybrids were triploids, a few fertile pollen grains were obtained due to the formation of restitution nuclei in the F 1 plants. Interspecific derivatives at the BC 2 F 2 generation were scored for early leaf spot, late leaf spot and to Spodoptera damage. Screening results showed that 29% of the derivatives had both early and late leaf spot resistance and that less than 5% of the derivatives had resistance to both the foliar diseases and to Spodoptera .