Título

Spatial distribution of genetic diversity in wild populations of Phaseolus vulgaris L. from Guanajuato and Michoacán, México

Autor

EMETERIO PAYRO DE LA CRUZ

Paul Gepts

SILVIA PATRICIA COLUNGA GARCIA MARIN

DANIEL ZIZUMBO VILLARREAL

Nivel de Acceso

Acceso Abierto

Referencia de datos

doi: DOI 10.1007/s10722-004-6125-x

Resumen o descripción

The diversity, genetic structure, and genetic flow of wild populations of Phaseolus vulgaris L. within its Mesoamerican area of domestication, were analyzed by means of morphological and inter-simple sequence repeat molecular markers. Overall, 89% of the loci studied were polymorphic, 35% in the least diverse population and 65% in the most diverse. Genetic diversity in the populationswas high, between h = 0.14 and 0.29, as was the maximum distance between populations (D = 0.3). Between 40% and 45% of the diversity was explained by the differences among populations, indicating that a large number of populations is necessary to represent the wild gene pool in the germplasm collections. We found uniformity in allele frequencies among the populations, suggesting presence of outcrossing. We did not find correlation between genetic and geographic distances, but the dendrogram topology suggests geographical isolation due to the mountainous topography. Negative correlations were observed between the coefficient of variation of seed size and the distance between wild populations and fields . We obtained a highly negative correlation between percentage of polymorphic loci and distance to the nearest crop field, which also suggests gene flow from the domesticated populations. These observations suggest that genetic flow is taking place from domesticated toward wild populations and that the farmer, through his agricultural activities, could be influencing the magnitude and the characteristics of the gene flow, and along with this, the differentiation of wild populations. New approaches should be established for conservation in situ and maintaining bio-safety, given the risk of introducing genotypes from the Andes and transgenic varieties and causing genetic assimilation.

Fecha de publicación

2005

Tipo de publicación

Artículo

Versión de la publicación

Versión publicada

Formato

application/pdf

Fuente

Genetic Resources and Crop Evolution, 52(5), 589-599, 2005

Idioma

Inglés

Relación

&

Villareal, D. Z. (2005). Spatial Distribution of Genetic Diversity in Wild Populations of Phaseolus vulgarisL. from Guanajuato and Michoacán, México. Genetic Resources and Crop Evolution, 52(5), 589-599.

Sugerencia de citación

de la Cruz, E. P., Gepts, P., GarciaMarín, P. C.,

Repositorio Orígen

Repositorio Institucional CICY

Descargas

315

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