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Genetic diversity and population structure in a collection of roselle (Hibiscus sabdariffa L.) from Niger

Bakasso Y., Zaman-Allah M., Mariac C., Billot C., Vigouroux Y., Zongo J.D., Saadou M.. 2014. Plant Genetic Resources, 12 (2) : p. 207-214.

Roselle (Hibiscus sabdariffa L.) is an economically important plant in Niger. Little is known about its genetic diversity and population structure. In this study, we performed the first diversity assessment of a collection of 124 roselle accessions and 16 accessions of its close relatives Hibiscus cannabinus and Abelmoschus esculentus. Our study was based on ten agromorphological traits and 267 amplified fragment length polymorphism markers. We identified two major distinct groups in H. sabdariffa using a Bayesian method. These two genetic groups were associated with statistical differences for three phenological characteristics: number of days to flowering, 100-seed weight and calyx size. However, the calyx colour, i.e. a morphological characteristic often used to classify different local ecotypes, did not superimpose this separation. Our findings suggested that roselle diversity is genetically structured; the two different groups were clearly associated with morphological differences but were not commonly used by farmers for their classification. The impact of the perceived ecotype structure and its consequence on farmer management is discussed. (Résumé d'auteur)

Mots-clés : méthode statistique; adn; distribution géographique; caractère agronomique; anatomie végétale; morphologie végétale; polymorphisme génétique; marqueur génétique; abelmoschus esculentus; hibiscus cannabinus; collection de matériel génétique; génétique des populations; variation génétique; hibiscus sabdariffa; niger

Thématique : Génétique et amélioration des plantes; Taxonomie végétale et phyto-géographie; Anatomie et morphologie des plantes; Méthodes mathématiques et statistiques

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