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Evolution of cassava (Manihot esculenta Crantz) after recent introduction into a South Pacific Island system. The contribution of sex to the diversification of a clonally propagated crop

Sardos J., McKey D.B., Duval M.F., Malapa R., Noyer J.L., Lebot V.. 2008. Genome (Ottawa), 51 (11) : p. 912-921.

Cassava (Manihot esculenta Crantz) is a clonally propagated crop that was introduced into the South Pacific archipelago of Vanuatu in the 1850s. Based on a survey conducted in 10 different villages throughout the archipelago, we present here a study of its diversity. Farmers¿ knowledge about cultivation cycle and sexual reproduction of cassava was recorded during group interviews in each village. Using a set of 11 SSR markers, we genotyped the 104 landraces collected and 60 supplementary accessions from a within-landrace study (12 landraces × 5 plants). Out of the 104 landraces collected, we discovered 77 different multilocus genotypes and the within-landrace study identified several polyclonal landraces. Our data suggest a number of hypotheses about the dynamics of diversity of cassava in Vanuatu (Résumé d'auteur)

Mots-clés : génotype; phylogénie; identification; microsatellite; variété indigène; collecte de données; reproduction sexuée; multiplication végétative; variation génétique; manihot esculenta; vanuatu

Thématique : Génétique et amélioration des plantes; Taxonomie végétale et phyto-géographie

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