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Genetic mapping, synteny, and physical location of two loci for Fusarium oxysporum f. sp tracheiphilum race 4 resistance in cowpea [Vigna unguiculata (L.) Walp]

文献类型： 外文期刊

作者： Pottorff, Marti O. 1 ; Li, Guojing 2 ; Ehlers, Jeffery D. 1 ; Close, Timothy J. 1 ; Roberts, Philip A. 4 ;

作者机构： 1.Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA

2.Zhejiang Acad Agr Sci, Hangzhou, Zhejiang, Peoples R China

3.Bill & Melinda Gates Fdn, Seattle, WA USA

4.Univ Calif Riverside, Dept Nematol, Riverside, CA 92521 USA

关键词： Cowpea;Fusarium wilt;Disease resistance;Candidate genes;Genomics;Synteny

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

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收录情况： SCI

摘要： Fusarium wilt is a vascular disease caused by the fungus Fusarium oxysporum f.sp. tracheiphilum (Fot) in cowpea [Vigna unguiculata (L.) Walp]. In this study, we mapped loci conferring resistance to Fot race 4 in three cowpea RIL populations: IT93K-503-1 x CB46, CB27 x 24-125B-1, and CB27 x IT82E-18/Big Buff. Two independent loci which confer resistance to Fot race 4 were identified, Fot4-1 and Fot4-2. Fot4-1 was identified in the IT93K-503-1 (resistant) x CB46 (susceptible) population and was positioned on the cowpea consensus genetic map, spanning 21.57-29.40 cM on linkage group 5. The Fot4-2 locus was validated by identifying it in both the CB27 (resistant) x 24-125B-1 (susceptible) and CB27 (resistant) x IT82E-18/Big Buff (susceptible) populations. Fot4-2 was positioned on the cowpea consensus genetic map on linkage group 3; the minimum distance spanned 71.52-71.75 cM whereas the maximum distance spanned 64.44-80.23 cM. These genomic locations of Fot4-1 and Fot4-2 on the cowpea consensus genetic map, relative to Fot3-1 which was previously identified as the locus conferring resistance to Fot race 3, established that all three loci were independent. The Fot4-1 and Fot4-2 syntenic loci were examined in Glycine max, where several disease-resistance candidate genes were identified for both loci. In addition, Fot4-1 and Fot4-2 were coarsely positioned on the cowpea physical map. Fot4-1 and Fot4-2 will contribute to molecular marker development for future use in marker-assisted selection, thereby expediting introgression of Fot race 4 resistance into future cowpea cultivars.

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