La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Reproductive biology of a mycoheterotrophic species, Burmannia wallichii (Burmanniaceae)
Auteurs :	Dianxiang Zhang, Auteur ; Richard M. K. Saunders, Auteur
Type de document :	Article
Dans :	Botanical Journal of the Linnean Society (132(4) 2000-04-01)
Article en page(s) :	359-367
Résumé :	The breeding system of a mycoheterotrophic species, Burmannia wallichii (Miers) Hook. f. (Burmanniaceae), is assessed using field observations, floral anatomy, pollen histochemistry and isozyme electrophoresis. The structure of the flower effectively prevents pollinators from accessing the stamens, and no pollinators were observed visiting natural populations in Hong Kong. The pollen is starch-rich but lipid-poor. Analysis of isozyme variation revealed a small proportion of polymorphic loci, a low level of total heterozygosity (HT = 0.1972), and a very high overall fixation index of populations (FIT = 0.6602). These results strongly suggest that B. wallichii is predominantly self-pollinated. The coefficient of gene differentiation (GST) is low (0.05), although it is suggested that this is due to genetic homogenization of populations consonant with the formation of numerous tiny ‘diaspora’ seeds that are wind dispersed.
En ligne :	https://doi.org/10.1111/j.1095-8339.2000.tb01217.x

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