Continental-scale distribution and diversity of Ceratobasidium orchid mycorrhizal fungi in Australia.

Autor: Freestone MW; Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 2600, Australia.; Royal Botanic Gardens Victoria, Cranbourne, VIC 3977, Australia.; Biodiversity and Conservation Division, Department of Agriculture, Water and Environment, Canberra, ACT 2600, Australia., Swarts ND; Tasmanian Institute of Agriculture, The University of Tasmania, Sandy Bay, TAS 7005, Australia.; Royal Tasmanian Botanical Gardens, Hobart, TAS 7000, Australia., Reiter N; Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 2600, Australia.; Royal Botanic Gardens Victoria, Cranbourne, VIC 3977, Australia., Tomlinson S; Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia.; Kings Park Science, Department of Biodiversity, Conservation and Attractions, West Perth, WA 6005, Australia., Sussmilch FC; Tasmanian Institute of Agriculture, The University of Tasmania, Sandy Bay, TAS 7005, Australia., Wright MM; Royal Tasmanian Botanical Gardens, Hobart, TAS 7000, Australia., Holmes GD; Royal Botanic Gardens Victoria, Cranbourne, VIC 3977, Australia., Phillips RD; Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 2600, Australia.; Royal Botanic Gardens Victoria, Cranbourne, VIC 3977, Australia.; Kings Park Science, Department of Biodiversity, Conservation and Attractions, West Perth, WA 6005, Australia.; Department of Ecology, Environment and Evolution, LaTrobe University, Bundoora, VIC 3086, Australia., Linde CC; Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 2600, Australia.
Jazyk: angličtina
Zdroj: Annals of botany [Ann Bot] 2021 Aug 26; Vol. 128 (3), pp. 329-343.
DOI: 10.1093/aob/mcab067
Abstrakt: Background and Aims: Mycorrhizal fungi are a critical component of the ecological niche of most plants and can potentially constrain their geographical range. Unlike other types of mycorrhizal fungi, the distributions of orchid mycorrhizal fungi (OMF) at large spatial scales are not well understood. Here, we investigate the distribution and diversity of Ceratobasidium OMF in orchids and soils across the Australian continent.
Methods: We sampled 217 Ceratobasidium isolates from 111 orchid species across southern Australia and combined these with 311 Ceratobasidium sequences from GenBank. To estimate the taxonomic diversity of Ceratobasidium associating with orchids, phylogenetic analysis of the ITS sequence locus was undertaken. Sequence data from the continent-wide Australian Microbiome Initiative were used to determine the geographical range of operational taxonomic units (OTUs) detected in orchids, with the distribution and climatic correlates of the two most frequently detected OTUs modelled using MaxEnt.
Key Results: We identified 23 Ceratobasidium OTUs associating with Australian orchids, primarily from the orchid genera Pterostylis, Prasophyllum, Rhizanthella and Sarcochilus. OTUs isolated from orchids were closely related to, but distinct from, known pathogenic fungi. Data from soils and orchids revealed that ten of these OTUs occur on both east and west sides of the continent, while 13 OTUs were recorded at three locations or fewer. MaxEnt models suggested that the distributions of two widespread OTUs are correlated with temperature and soil moisture of the wettest quarter and far exceeded the distributions of their host orchid species.
Conclusions: Ceratobasidium OMF with cross-continental distributions are common in Australian soils and frequently have geographical ranges that exceed that of their host orchid species, suggesting these fungi are not limiting the distributions of their host orchids at large spatial scales. Most OTUs were distributed within southern Australia, although several OTUs had distributions extending into central and northern parts of the continent, illustrating their tolerance of an extraordinarily wide range of environmental conditions.
(© The Author(s) 2021. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje