Impact of farmer selection on yam genetic diversity View Full Text


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Article Info

DATE

2010-12

AUTHORS

H. Chaïr, D. Cornet, M. Deu, M. N. Baco, A. Agbangla, M. F. Duval, J. L. Noyer

ABSTRACT

In the traditional yam agricultural system, by way of an ennoblement practice, farmers select tubers from the wild for cultivation. In order to assess the impact of that practice on the genetic diversity of yam, we studied the genetic structure of yams obtained after at least 3 years of ennoblement, to which farmers gave the name of traditional varieties. Cultivated yams do not always have the same genotype as homonymous traditional varieties. For the first time, we demonstrated selection by farmers through the ennoblement of genotypes found in neighbouring villages. Their adoption has a double impact: it allows an increase in the polyclonality of varieties and an indirect exchange of yam tubers between farmers. We also demonstrated that wild yams and hybrids between wild and cultivated yams are also selected. However, their adoption seems less frequent, suggesting selection and valuation of ennobled yams before integration into the cultivated pool. Finally, the adaptive advantage of wild and hybrid yams and their role in yam agrosystems are discussed. More... »

PAGES

2255-2265

References to SciGraph publications

  • 2003-08. Yam (Dioscorea ssp.) domestication by the Nago and Fon ethnic groups in Benin in GENETIC RESOURCES AND CROP EVOLUTION
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  • 2007-01. Local genetic diversity of sorghum in a village in northern Cameroon: structure and dynamics of landraces in THEORETICAL AND APPLIED GENETICS
  • 1990-06. The classification of the cultivated yams (Dioscorea cayenensis-rotundata complex) of West Africa in EUPHYTICA
  • 2007-07. Genetic diversity and variety composition of cassava on small-scale farms in Uganda: an interdisciplinary study using genetic markers and farmer interviews in GENETICA
  • 1999-08. Morphological diversity, cultivar groups and possible descent in the cultivated yams (Dioscorea cayenensis/D. rotundata) complex in Benin Republic in GENETIC RESOURCES AND CROP EVOLUTION
  • 2004-03. Unconscious selection and the evolution of domesticated Plants in ECONOMIC BOTANY
  • 2007-12. Conservation genetics in a globally changing environment: present problems, paradoxes and future challenges in BIODIVERSITY AND CONSERVATION
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10592-010-0110-z

    DOI

    http://dx.doi.org/10.1007/s10592-010-0110-z

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1038221967


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