Fine root endophytes under scrutiny: a review of the literature on arbuscule-producing fungi recently suggested to belong to the Mucoromycotina

Suzanne Orchard, Rachel J. Standish, Ian A. Dickie, Michael Renton, Christopher Walker, Derrick Moot, Megan H. Ryan

Research output: Contribution to journalReview article

19 Citations (Scopus)
189 Downloads (Pure)

Abstract

Fine root endophytes (FRE) are arbuscule-forming fungi presently considered as a single species—Glomus tenue in the Glomeromycota (Glomeromycotina)—but probably belong within the Mucoromycotina. Thus, FRE are the only known arbuscule-forming fungi not within the arbuscular mycorrhizal fungi (AMF; Glomeromycotina) as currently understood. Phylogenetic differences between FRE and AMF could reflect ecological differences. To synthesize current ecological knowledge, we reviewed the literature on FRE and identified 108 papers that noted the presence of FRE and, in some, the colonization levels for FRE or AMF (or both). We categorized these records by geographic region, host-plant family and environment (agriculture, moderate-natural, low-temperature, high-altitude and other) and determined their influence on the percentage of root length colonized by FRE in a meta-analysis. We found that FRE are globally distributed, with many observations from Poaceae, perhaps due to grasses being widely distributed. In agricultural environments, colonization by FRE often equalled or exceeded that of AMF, particularly in Australasia. In moderate-natural and high-altitude environments, average colonization by FRE (~10%) was lower than that of AMF (~35%), whereas in low-temperature environments, colonization was similar (~20%). Several studies suggested that FRE can enhance host-plant phosphorus uptake and growth, and may be more resilient than AMF to environmental stress in some host plants. Further research is required on the functioning of FRE in relation to the environment, host plant and co-occurring AMF and, in particular, to examine whether FRE are important for plant growth in stressful environments. Targeted molecular primers are urgently needed for further research on FRE.

Original languageEnglish
Pages (from-to)619–638
Number of pages20
JournalMycorrhiza
Volume27
Issue number7
DOIs
Publication statusPublished - Oct 2017

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Mucoromycotina
Endophytes
endophyte
fine root
endophytes
Fungi
fungus
fungi
host plant
colonization
host plants
Poaceae
fine roots
Australasia
Temperature

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@article{3198f5eb14b749dfa897411cad52cdbf,
title = "Fine root endophytes under scrutiny: a review of the literature on arbuscule-producing fungi recently suggested to belong to the Mucoromycotina",
abstract = "Fine root endophytes (FRE) are arbuscule-forming fungi presently considered as a single species—Glomus tenue in the Glomeromycota (Glomeromycotina)—but probably belong within the Mucoromycotina. Thus, FRE are the only known arbuscule-forming fungi not within the arbuscular mycorrhizal fungi (AMF; Glomeromycotina) as currently understood. Phylogenetic differences between FRE and AMF could reflect ecological differences. To synthesize current ecological knowledge, we reviewed the literature on FRE and identified 108 papers that noted the presence of FRE and, in some, the colonization levels for FRE or AMF (or both). We categorized these records by geographic region, host-plant family and environment (agriculture, moderate-natural, low-temperature, high-altitude and other) and determined their influence on the percentage of root length colonized by FRE in a meta-analysis. We found that FRE are globally distributed, with many observations from Poaceae, perhaps due to grasses being widely distributed. In agricultural environments, colonization by FRE often equalled or exceeded that of AMF, particularly in Australasia. In moderate-natural and high-altitude environments, average colonization by FRE (~10{\%}) was lower than that of AMF (~35{\%}), whereas in low-temperature environments, colonization was similar (~20{\%}). Several studies suggested that FRE can enhance host-plant phosphorus uptake and growth, and may be more resilient than AMF to environmental stress in some host plants. Further research is required on the functioning of FRE in relation to the environment, host plant and co-occurring AMF and, in particular, to examine whether FRE are important for plant growth in stressful environments. Targeted molecular primers are urgently needed for further research on FRE.",
keywords = "Arbuscular mycorrhizal fungi, Fine endophyte, Glomus tenue, Glomus tenuis, Mucoromycotina, Rhizophagus tenuis",
author = "Suzanne Orchard and Standish, {Rachel J.} and Dickie, {Ian A.} and Michael Renton and Christopher Walker and Derrick Moot and Ryan, {Megan H.}",
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pages = "619–638",
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Fine root endophytes under scrutiny : a review of the literature on arbuscule-producing fungi recently suggested to belong to the Mucoromycotina. / Orchard, Suzanne; Standish, Rachel J.; Dickie, Ian A.; Renton, Michael; Walker, Christopher; Moot, Derrick; Ryan, Megan H.

In: Mycorrhiza, Vol. 27, No. 7, 10.2017, p. 619–638.

Research output: Contribution to journalReview article

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T2 - a review of the literature on arbuscule-producing fungi recently suggested to belong to the Mucoromycotina

AU - Orchard, Suzanne

AU - Standish, Rachel J.

AU - Dickie, Ian A.

AU - Renton, Michael

AU - Walker, Christopher

AU - Moot, Derrick

AU - Ryan, Megan H.

PY - 2017/10

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N2 - Fine root endophytes (FRE) are arbuscule-forming fungi presently considered as a single species—Glomus tenue in the Glomeromycota (Glomeromycotina)—but probably belong within the Mucoromycotina. Thus, FRE are the only known arbuscule-forming fungi not within the arbuscular mycorrhizal fungi (AMF; Glomeromycotina) as currently understood. Phylogenetic differences between FRE and AMF could reflect ecological differences. To synthesize current ecological knowledge, we reviewed the literature on FRE and identified 108 papers that noted the presence of FRE and, in some, the colonization levels for FRE or AMF (or both). We categorized these records by geographic region, host-plant family and environment (agriculture, moderate-natural, low-temperature, high-altitude and other) and determined their influence on the percentage of root length colonized by FRE in a meta-analysis. We found that FRE are globally distributed, with many observations from Poaceae, perhaps due to grasses being widely distributed. In agricultural environments, colonization by FRE often equalled or exceeded that of AMF, particularly in Australasia. In moderate-natural and high-altitude environments, average colonization by FRE (~10%) was lower than that of AMF (~35%), whereas in low-temperature environments, colonization was similar (~20%). Several studies suggested that FRE can enhance host-plant phosphorus uptake and growth, and may be more resilient than AMF to environmental stress in some host plants. Further research is required on the functioning of FRE in relation to the environment, host plant and co-occurring AMF and, in particular, to examine whether FRE are important for plant growth in stressful environments. Targeted molecular primers are urgently needed for further research on FRE.

AB - Fine root endophytes (FRE) are arbuscule-forming fungi presently considered as a single species—Glomus tenue in the Glomeromycota (Glomeromycotina)—but probably belong within the Mucoromycotina. Thus, FRE are the only known arbuscule-forming fungi not within the arbuscular mycorrhizal fungi (AMF; Glomeromycotina) as currently understood. Phylogenetic differences between FRE and AMF could reflect ecological differences. To synthesize current ecological knowledge, we reviewed the literature on FRE and identified 108 papers that noted the presence of FRE and, in some, the colonization levels for FRE or AMF (or both). We categorized these records by geographic region, host-plant family and environment (agriculture, moderate-natural, low-temperature, high-altitude and other) and determined their influence on the percentage of root length colonized by FRE in a meta-analysis. We found that FRE are globally distributed, with many observations from Poaceae, perhaps due to grasses being widely distributed. In agricultural environments, colonization by FRE often equalled or exceeded that of AMF, particularly in Australasia. In moderate-natural and high-altitude environments, average colonization by FRE (~10%) was lower than that of AMF (~35%), whereas in low-temperature environments, colonization was similar (~20%). Several studies suggested that FRE can enhance host-plant phosphorus uptake and growth, and may be more resilient than AMF to environmental stress in some host plants. Further research is required on the functioning of FRE in relation to the environment, host plant and co-occurring AMF and, in particular, to examine whether FRE are important for plant growth in stressful environments. Targeted molecular primers are urgently needed for further research on FRE.

KW - Arbuscular mycorrhizal fungi

KW - Fine endophyte

KW - Glomus tenue

KW - Glomus tenuis

KW - Mucoromycotina

KW - Rhizophagus tenuis

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