HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Martínez-Castillo, J. Articles by Colunga-GarcíaMarín, P. Search for Related Content PubMed Articles by Martínez-Castillo, J. Articles by Colunga-GarcíaMarín, P. Agricola Articles by Martínez-Castillo, J. Articles by Colunga-GarcíaMarín, P. Related Collections Ecological Risk Assessment Plant Genetic Resources Crop Ecology

PLANT GENETIC RESOURCES

Gene Flow and Genetic Structure in the Wild–Weedy–Domesticated Complex of Phaseolus lunatus L. in its Mesoamerican Center of Domestication and Diversity

^a Centro de Investigación Científica de Yucatán (CICY), Calle 43 No. 130, Col. Chuburná de Hidalgo, 97200 Mérida, Yucatán, México
^b Dep. of Agronomy and Range Science, Univ. of California, Davis, CA

^* Corresponding author (pcolunga{at}cicy.mx)

The role of gene flow in autogamous domesticated species diversity and their wild relatives is an issue that requires more field data. Using nine microsatellite loci, an analysis was done of the magnitude and direction of gene flow in the wild–weedy–domesticated complex of Phaseolus lunatus L. under traditional agricultural conditions in four regions on the Yucatan Peninsula, Mexico, its center of domestication and diversity in Mesoamerica. Two complementary methods were used. The Bayesian genotype assignment approach showed that recent gene flow was low at both the intraregional and interregional levels. The same was found with the frequency method for long-term gene flow (Nm intraregional from 0.31 to 0.51, and Nm interregional = 0.44). In addition, the gene flow from domesticate to wild populations was three times higher than in the opposite direction. This asymmetry can be explained by regional agricultural practices and seed selection criteria. Domesticate alleles were shown to be entering wild populations of different agricultural regions, suggesting exchange of domesticated seed between farmers of different regions. These results are very important because they show that P. lunatus on the Yucatan Peninsula has a predominantly domesticate to wild gene flow. This situation may lead to genetic assimilation of wild lima bean by its domesticated counterpart and may lead to the possible escape of transgenes in this center of origin and diversity.

Abbreviations: CEQROO, central eastern Quintana Roo • MCMC, Monte Carlo Markov Chain • NECAMP, northeast Campeche • SEYUC, southeast Yucatan • SSR, simple sequence repeat • SYUC, southern Yucatan