Evidence for orthologous seed weight genes in cowpea and mung bean based on RFLP mapping

C. A. Fatokun, D. I. Menancio-Hautea, D. Danesh, N. D. Young

Research output: Contribution to journalArticlepeer-review

144 Scopus citations

Abstract

A well saturated genomic map is a necessity for a breeding program based on marker assisted selection. To this end, we are developing genomic maps for cowpea (Vigna unguiculata 2N=22) and mung bean (Vigna radiata 2N=22) based on restriction fragment length polymorphism (RFLP) markers. Using these maps, we have located major quantitative trait loci (QTLs) for seed weight in both species. Two unlinked genomic regions in cowpea contained QTLs accounting for 52.7% of the variation for seed weight. In mung bean there were four unlinked genomic regions accounting for 49.7% of the variation for seed weight. In both cowpea and mung bean the genomic region with the greatest effect on seed weight spanned the same RFLP markers in the same linkage order. This suggests that the QTLs in this genomic region have remained conserved through evolution. This inference is supported by the observation that a significant interaction (i.e., epistasis) was detected between the QTL(s) in the conserved region and an unlinked RFLP marker locus in both species.

Original languageEnglish (US)
Pages (from-to)841-846
Number of pages6
JournalGenetics
Volume132
Issue number3
StatePublished - Jan 1 1992

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