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Front Plant Sci. 2015 Dec 1;6:1050. doi: 10.3389/fpls.2015.01050. eCollection 2015.

A Homoploid Hybrid Between Wild Vigna Species Found in a Limestone Karst.

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Genetic Resources Center, National Institute of Agrobiological Sciences Tsukuba, Japan.
Department of International Agricultural Development, Tokyo University of Agriculture Tokyo, Japan.
Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University Nakhon Pathom, Thailand.


Genus Vigna comprise several domesticated species including cowpea and mungbean, and diverse wild species. We found an introgressive hybrid population derived from two wild species, Vigna umbellata and Vigna exilis, in Ratchaburi district, Thailand. The hybrid was morphologically similar to V. umbellata but habituated in a limestone rock mountain, which is usually dominated by V. exilis. Analyzing simple sequence repeat loci indicated the hybrid has undergone at least one round of backcross by V. umbellata. We found the hybrid acquired vigorous growth from V. umbellata and drought tolerance plus early flowering from V. exilis, and thus has taken over some habitats of V. exilis in limestone karsts. Given the wide crossability of V. umbellata, the hybrid can be a valuable genetic resource to improve drought tolerance of some domesticated species.


drought tolerance; genetic resource; genus Vigna; homoploid hybrid speciation; introgressive hybridization; natural hybrid; stress tolerance; wild crop relatives

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