Observations on the geographic distribution, ecology and conservation status of several Phaseolus bean species in Costa Rica |
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Authors: | Rodolfo Araya Villalobos William G. González Ugalde Fausto Camacho Chacón Patricia Sánchez Trejos Daniel G. Debouck |
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Affiliation: | (1) Estación Experimental Fabio Baudrit Moreno, Programa de Fitomejoramiento, Universidad de Costa Rica, Apartado 183-4050, Alajuela, Costa Rica;(2) Centro de Investigación en Granos y Semillas, Universidad de Costa Rica, San Pedro, San José, Costa Rica;(3) Sede Regional de Liberia, Universidad de Costa Rica, San Pedro, San José, Costa Rica;(4) Unidad de Recursos Genéticos, Centro Internacional de Agricultura Tropical, Apartado Aéreo 6713, Cali, Colombia |
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Abstract: | Interest in bean genetic resources of Central America has resumed because of disease pressures (e.g., web blight, BGMV) and limitations of current bean varieties. As most of the diversity in landraces has been explored, focus is now on the exploration of wild forms of the primary gene pool and wild species of the secondary gene pool. A germplasm collection was carried out in the field and resulted in the collection of 29 wild populations for six Phaseolus species; it complemented field work done in 1987. Nine more populations were found for P. costaricensis, 10 for wild P. lunatus, one for P. oligospermus, one for P. tuerckheimii, four for wild P. vulgaris and four for P. xanthotrichus. Ninety-three herbarium voucher specimens were collected for 19 populations of the six species (deposited at CR). These results confirm the presence of wild P. vulgaris on both slopes of the central valley of Costa Rica, namely in the life zones bh-MB and bmh-P, and of P. costaricensis in the life zone bmh-MB. These life zones of limited range in Costa Rica have been heavily modified, thus fully justifying the germplasm collection for ex situ conservation. For both species the range of distribution in Costa Rica has been almost completely sampled. The life characteristics of each species that are relevant for their conservation in situ are briefly reviewed. Distribution ranges of each wild bean species are compared with the present extension of national parks, protected areas and fauna/flora sanctuaries, and suggestions for expanding such protected areas are made. |
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Keywords: | Central America Common bean In situ conservation National parks Plant genetic resources Wild species |
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