Geographical range and host breadth ofSebacinaorchid mycorrhizal fungi associating withCaladeniain south-western Australia
| Autor: | Kingsley W. Dixon, Ryan D. Phillips, Emma L. Dalziell, Nigel D. Swarts, Matthew D. Barrett |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Orchidaceae biology Ecology Range (biology) Biogeography Plant Science Reproductive isolation biology.organism_classification 010603 evolutionary biology 01 natural sciences Caladenia Taxon Mycorrhiza Sebacina Ecology Evolution Behavior and Systematics 010606 plant biology & botany |
| Zdroj: | Botanical Journal of the Linnean Society. 182:140-151 |
| ISSN: | 0024-4074 |
| DOI: | 10.1111/boj.12453 |
| Popis: | Specialized mycorrhizal interactions have the potential to limit the geographical range of plant species and contribute to reproductive isolation. We investigated these predictions in Caladenia (Orchidaceae) from south-western Australia, a group known to have specialized mycorrhizal associations with the genus Sebacina s.l. Sequencing of fungal isolates from 47 of the 136 species of Western Australian Caladenia was undertaken to resolve the geographical range and habitat preferences of mycorrhizal fungal operational taxonomic units (OTUs) and their host breadth in Caladenia. Eight different fungal OTUs were used by Caladenia, with the more frequently detected OTUs occurring in a wide range of habitats and geographical regions. Given the comparatively narrow geographical ranges of most Western Australian Caladenia taxa, this suggests that the geographical ranges of fungal OTUs are unlikely to limit the geographical range of Caladenia spp. Extensive sharing of fungal OTUs between closely related orchid species was detected, suggesting that in the main there is little potential for mycorrhizal fungi to contribute to reproductive isolation between Caladenia spp. Our data mostly support previous work suggesting high mycorrhizal specificity in Caladenia, but this may not be the case in all subgenera, highlighting that Caladenia may offer powerful opportunities for investigating the evolution of specialized mycorrhizal associations. |
| Databáze: | OpenAIRE |
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