MycorrhizaeV1, Main, Corpus, bibRecord, 001C68

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 : 001C69

Variation 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. Merritt

Source :

Annals of botany [ 1095-8290 ] ; 2013.

RBID : pubmed:23532043

English descriptors

KwdEn :
- Biodiversity (MeSH), Carbohydrate Metabolism (MeSH), Mycorrhizae (metabolism), Nitrogen Compounds (metabolism), Orchidaceae (microbiology), Phosphorus Compounds (metabolism), Species Specificity (MeSH), Western Australia (MeSH).
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:23532043

Le 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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<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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<term>Phosphorus Compounds</term>
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<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Orchidaceae</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>
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Variation in nutrient-acquisition patterns by mycorrhizal fungi of rare and common orchids explains diversification in a global biodiversity hotspot.

Variation in nutrient-acquisition patterns by mycorrhizal fungi of rare and common orchids explains diversification in a global biodiversity hotspot.

Source :

English descriptors

Abstract

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki