Abstract
Four pathways for gene introgression into Arachis hypogaea L. were studied. Two hexaploid routes involved direct crosses of diploid Arachis species and diploid species hybrids with A. hypogaea (Pathways 1 and 2, respectively) and were followed by chromosome doubling with colchicine. A third pathway, a tetraploid route, involved chromosome doubling of a diploid hybrid before crossing with A. hypogaea. These first three routes involved only the A genome species, and all were unsuccessful because of lack of fertility. The fourth pathway, also a tetraploid route, utilized the B genome A. batizocoi Krap. et Greg. as a bridge species and brought about a successful (fertile) introgression. Genes from A. cardenasii Krap. et Greg. nom. nud. and A. chacoensis Krap et Greg. nom. nud. were combined into a hybrid and incorporated into A. hypogaea by using the B genome bridge species. Introgression of additional characters from these and other species through this pathway should be possible.
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Keywords: peanut, Groundnut, Arachis hypogaea L, interspecific hybrids, Introgression, Leafspot, nematode, resistance, Wild species
How to Cite:
Simpson, C., (1991) “Pathways for Introgression of Pest Resistance into Arachis hypogaea L.¹”, Peanut Science 18(1), p.22-26. doi: https://doi.org/10.3146/i0095-3679-18-1-8