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Isozyme diversity and analysis of the mating system of the wild rice Oryza latifolia Desv. in Costa Rica

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Abstract

Oryza latifolia is the most abundant and widespread wild relative of rice in the lowlands of Costa Rica. It also has the most diverse morphology. However, little is known about the genetic diversity and mating system of this allotetraploid species. Genetic analyses of nine populations from different life zones from the Pacific and Atlantic slopes were performed using six isozyme loci. Differences in genetic variability were observed among populations, of which Palo Verde and Santa Rosa were the most diverse. Most Atlantic populations clustered together, and a similar result was obtained with the Pacific populations. High levels of interpopulation diversity were observed while most populations were monomorphic for at least one genotype, suggesting little genetic flow within populations. Even in polymorphic populations no variation was observed within progeny groups, combined with Hardy-Weinberg disequilibria in most populations, commonly observed in autogamous species or in species with clonal reproduction. However, the high frequency of heterozygous-like patterns may suggest that the reproductive system of O. latifolia might be more complex. Future research may explain the genetic patterns as well as the reproductive biology of this species. The knowledge of the genetic diversity and mating system of O. latifolia could contribute to the implementation of genetic resource conservation strategies and gene flow analyses, as well as of breeding programs for rice improvement.

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Authors and Affiliations

  1. Centro de Investigación en Biología Celular y Molecular (CIBCM), Universidad de Costa Rica, Costa Rica

    Tania Quesada & Ana M. Espinoza

  2. Escuela de Biología, Universidad de Costa Rica, Costa Rica

    Jorge Lobo

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  1. Tania Quesada
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  2. Jorge Lobo
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  3. Ana M. Espinoza
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Quesada, T., Lobo, J. & Espinoza, A.M. Isozyme diversity and analysis of the mating system of the wild rice Oryza latifolia Desv. in Costa Rica. Genetic Resources and Crop Evolution 49, 633–643 (2002). https://doi.org/10.1023/A:1021240924383

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