Genetic variation in Vanilla planifolia (Orchidaceae) |
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Authors: | Philipp M Schlüter Miguel A Soto Arenas Stephen A Harris |
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Institution: | 1. Department of Plant Sciences, University of Oxford, South Parks Road, OX1 3RB, Oxford, UK 3. Laboratorio de Genética Molecular y Evolución, Instituto de Ecología, UNAM, México, D. F., Mexico
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Abstract: | Vanilla planifolia, a highly prized tropical crop, produces commercial, vanilla. We investigated RAPD genetic diversity and geographical structure
within V. planifolia. Multivariate analyses revealed three separate geographical groups of V. planifolia: a) a Costa Rican group; b) a Mexican group consisting only of cultivated plants from north of the Trans-Mexican Volcanic
Belt; and c) a Mexican group from Oaxaca, Chiapas, and Quintana Roo, which are wild and wild-sourced cultivated plants. It
appears likely that human action has resulted in movement of northern Mexican plants into the region south of the Volcanic
Belt. When supposed translocants are included, a significantly higher genetic diversity is observed south of the Volcanic
Belt compared to northern Mexico. Furthermore, cultivar names used in V. planifolia do not appear to reflect genetically defined groups. |
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