Variation in nutrient-acquisition patterns by mycorrhizal fungi of rare and common orchids explains diversification in a global biodiversity hotspot.
Identifieur interne : 001C68 ( Main/Corpus ); précédent : 001C67; suivant : 001C69Variation in nutrient-acquisition patterns by mycorrhizal fungi of rare and common orchids explains diversification in a global biodiversity hotspot.
Auteurs : Siti Nurfadilah ; Nigel D. Swarts ; Kingsley W. Dixon ; Hans Lambers ; David J. MerrittSource :
- Annals of botany [ 1095-8290 ] ; 2013.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Nitrogen Compounds, Phosphorus Compounds.
- geographic : Western Australia.
- metabolism : Mycorrhizae.
- microbiology : Orchidaceae.
- Biodiversity, Carbohydrate Metabolism, Species Specificity.
Abstract
BACKGROUND AND AIMS
Many terrestrial orchids have an obligate requirement for mycorrhizal associations to provide nutritional support from germination to establishment. This study will investigate the ability of orchid mycorrhizal fungi (OMF) to utilize a variety of nutrient sources in the nutrient-impoverished (low organic) soils of the Southwest Australian Floristic Region (SWAFR) in order to effectively compete, survive and sustain the orchid host.
METHODS
Mycorrhizal fungi representing key OMF genera were isolated from three common and widespread species: Pterostylis recurva, Caladenia flava and Diuris corymbosa, and one rare and restricted species: Drakaea elastica. The accessibility of specific nutrients was assessed by comparing growth including dry biomass of OMF in vitro on basal CN MMN liquid media.
KEY RESULTS
Each of the OMF accessed and effectively utilized a wide variety of nutrient compounds, including carbon (C) sources, inorganic and organic nitrogen (N) and inorganic and organic phosphorus (P). The nutrient compounds utilized varied between the genera of OMF, most notably sources of N.
CONCLUSIONS
These results suggest that OMF can differentiate between niches (micro-niche specialization) in a constrained, highly resource-limited environment such as the SWAFR. Phosphorus is the most limited macronutrient in SWAFR soils and the ability to access phytate by OMF indicates a characterizing functional capacity of OMF from the SWAFR. Furthermore, compared with OMF isolated from the rare D. elastica, OMF associating with the common P. recurva produced far greater biomass over a wider variety of nutritional sources. This suggests a broader tolerance for habitat variation providing more opportunities for the common orchid for recruitment and establishment at a site.
DOI: 10.1093/aob/mct064
PubMed: 23532043
PubMed Central: PMC3662510
Links to Exploration step
pubmed:23532043Le document en format XML
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<author><name sortKey="Nurfadilah, Siti" sort="Nurfadilah, Siti" uniqKey="Nurfadilah S" first="Siti" last="Nurfadilah">Siti Nurfadilah</name>
<affiliation><nlm:affiliation>School of Plant Biology, Faculty of Science, The University of Western Australia, Crawley, WA 6009, Australia.</nlm:affiliation>
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<author><name sortKey="Swarts, Nigel D" sort="Swarts, Nigel D" uniqKey="Swarts N" first="Nigel D" last="Swarts">Nigel D. Swarts</name>
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<author><name sortKey="Dixon, Kingsley W" sort="Dixon, Kingsley W" uniqKey="Dixon K" first="Kingsley W" last="Dixon">Kingsley W. Dixon</name>
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<author><name sortKey="Lambers, Hans" sort="Lambers, Hans" uniqKey="Lambers H" first="Hans" last="Lambers">Hans Lambers</name>
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<author><name sortKey="Merritt, David J" sort="Merritt, David J" uniqKey="Merritt D" first="David J" last="Merritt">David J. Merritt</name>
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<author><name sortKey="Lambers, Hans" sort="Lambers, Hans" uniqKey="Lambers H" first="Hans" last="Lambers">Hans Lambers</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biodiversity (MeSH)</term>
<term>Carbohydrate Metabolism (MeSH)</term>
<term>Mycorrhizae (metabolism)</term>
<term>Nitrogen Compounds (metabolism)</term>
<term>Orchidaceae (microbiology)</term>
<term>Phosphorus Compounds (metabolism)</term>
<term>Species Specificity (MeSH)</term>
<term>Western Australia (MeSH)</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Nitrogen Compounds</term>
<term>Phosphorus Compounds</term>
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<keywords scheme="MESH" type="geographic" xml:lang="en"><term>Western Australia</term>
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<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Mycorrhizae</term>
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<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Orchidaceae</term>
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<keywords scheme="MESH" xml:lang="en"><term>Biodiversity</term>
<term>Carbohydrate Metabolism</term>
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<front><div type="abstract" xml:lang="en"><p><b>BACKGROUND AND AIMS</b>
</p>
<p>Many terrestrial orchids have an obligate requirement for mycorrhizal associations to provide nutritional support from germination to establishment. This study will investigate the ability of orchid mycorrhizal fungi (OMF) to utilize a variety of nutrient sources in the nutrient-impoverished (low organic) soils of the Southwest Australian Floristic Region (SWAFR) in order to effectively compete, survive and sustain the orchid host.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>METHODS</b>
</p>
<p>Mycorrhizal fungi representing key OMF genera were isolated from three common and widespread species: Pterostylis recurva, Caladenia flava and Diuris corymbosa, and one rare and restricted species: Drakaea elastica. The accessibility of specific nutrients was assessed by comparing growth including dry biomass of OMF in vitro on basal CN MMN liquid media.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>KEY RESULTS</b>
</p>
<p>Each of the OMF accessed and effectively utilized a wide variety of nutrient compounds, including carbon (C) sources, inorganic and organic nitrogen (N) and inorganic and organic phosphorus (P). The nutrient compounds utilized varied between the genera of OMF, most notably sources of N.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>CONCLUSIONS</b>
</p>
<p>These results suggest that OMF can differentiate between niches (micro-niche specialization) in a constrained, highly resource-limited environment such as the SWAFR. Phosphorus is the most limited macronutrient in SWAFR soils and the ability to access phytate by OMF indicates a characterizing functional capacity of OMF from the SWAFR. Furthermore, compared with OMF isolated from the rare D. elastica, OMF associating with the common P. recurva produced far greater biomass over a wider variety of nutritional sources. This suggests a broader tolerance for habitat variation providing more opportunities for the common orchid for recruitment and establishment at a site.</p>
</div>
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<AbstractText Label="METHODS" NlmCategory="METHODS">Mycorrhizal fungi representing key OMF genera were isolated from three common and widespread species: Pterostylis recurva, Caladenia flava and Diuris corymbosa, and one rare and restricted species: Drakaea elastica. The accessibility of specific nutrients was assessed by comparing growth including dry biomass of OMF in vitro on basal CN MMN liquid media.</AbstractText>
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