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 Julie, McKey Doyle B., Duval Marie-France, Malapa Roger, Noyer Jean-Louis, Lebot Vincent. 2008. 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. Genome (Ottawa), 51 (11) : 912-921.

https://doi.org/10.1139/G08-080

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Résumé : 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.

Mots-clés Agrovoc : Manihot esculenta, variation génétique, multiplication végétative, reproduction sexuée, collecte de données, variété indigène, microsatellite, identification, phylogénie, génotype

Mots-clés géographiques Agrovoc : Vanuatu

Classification Agris : F30 - Génétique et amélioration des plantes
F70 - Taxonomie végétale et phytogéographie

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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