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Phillips R.D.,Botanic Garden and Parks Authority | Phillips R.D.,University of Western Australia | Phillips R.D.,Australian National University | Barrett M.D.,Botanic Garden and Parks Authority | And 3 more authors.
Journal of Ecology | Year: 2011

While rarely tested, the rarity of a species may be linked to the rarity of symbiotic partners. The requirement of many terrestrial plants to form a symbiosis with mycorrhizal fungi may limit the distribution and abundance of plant species. Here, in just the second test of the role of mycorrhiza in host species rarity, we investigate the influence of mycorrhizal specificity, distribution and ecological requirements in the genus Drakaea (Orchidaceae). In situ seed baiting was used to resolve the distribution of mycorrhizal fungi for three common and two co-occurring rare species of Drakaea. Mycorrhizal fungi were isolated from wild adult orchids and protocorms and the ITS nrDNA regions sequenced. An in vitro study tested the range of Drakaea species of which each fungus can support germination. All Drakaea species studied used a narrow monophyletic clade of Tulasnella endophyte for protocorm, seedling and adult plant stages. In situ seed baiting revealed that germination of Drakaea is largely restricted to the same microhabitat as that of the orchid. However, within this habitat Drakaea exhibit comparable germination to other Western Australian orchid genera. Rare and common Drakaea exhibited no difference in germination rates and both germinated in suitable habitat not currently occupied. Synthesis. In contrast to the previous study of the role of mycorrhiza in plant rarity, there was no evidence that mycorrhizal specificity contributed to rarity in Drakaea. However, the formation of mycorrhiza being mostly restricted to a specific microhabitat may limit the abundance of Drakaea in some landscapes. In Drakaea, the highly specific pollination system of sexual deception may contribute to rarity. A trend towards high specificity in orchid mycorrhizal associations in southern Australia is hypothesized to result from the predominance of old landscapes affording the opportunity for specialization on a single or few mycorrhiza(s) best adapted to the landscape conditions. © 2011 The Authors. Journal of Ecology © 2011 British Ecological Society.

Anthony J.M.,Botanic Garden and Parks Authority | Phillips R.D.,Botanic Garden and Parks Authority | Phillips R.D.,University of Western Australia | Sinclair E.A.,Botanic Garden and Parks Authority | And 3 more authors.
Conservation Genetics Resources | Year: 2010

Drakaea glyptodon is a sexually deceptive terrestrial orchid endemic to Western Australia. We developed fourteen polymorphic microsatellite markers to assess genetic variability within and among populations. Moderate to high levels of variation were detected at most loci. There was evidence for inbreeding with high inbreeding coefficients for some loci. This suite of markers will be used to assess population genetics and investigate the causes of rarity and speciation of Drakaea. © Springer Science+Business Media B.V. 2010.

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