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Arbuscular mycorrhiza under water — Carbon‒phosphorus exchange between rice and arbuscular mycorrhizal fungi under different flooding regimes

Bao, Xiaozhe LU ; Wang, Yutao and Olsson, Pål Axel LU (2019) In Soil Biology and Biochemistry 129. p.169-177
Abstract

Arbuscular mycorrhizal fungi (AMF) are commonly present in wetlands, but their functional role there is not well understood. We have quantified the carbon (C) allocation from rice to AMF under different flooding regimes, using stable isotope labeling (13CO2), and assessed the potential phosphorus (P) delivery from AMF to rice by profiling the expression of plant and fungal P transporter genes. The results showed that the plant-assimilated C was allocated to AMF under all flooding regimes, as evidenced by the significant enrichment of 13C in the AMF signature fatty acids. The plant C allocation to AMF declined at increased flooding intensity, and was strikingly greater at the growth stage when the rice... (More)

Arbuscular mycorrhizal fungi (AMF) are commonly present in wetlands, but their functional role there is not well understood. We have quantified the carbon (C) allocation from rice to AMF under different flooding regimes, using stable isotope labeling (13CO2), and assessed the potential phosphorus (P) delivery from AMF to rice by profiling the expression of plant and fungal P transporter genes. The results showed that the plant-assimilated C was allocated to AMF under all flooding regimes, as evidenced by the significant enrichment of 13C in the AMF signature fatty acids. The plant C allocation to AMF declined at increased flooding intensity, and was strikingly greater at the growth stage when the rice plants had a higher nutrient requirement. The gene expression profiles and rice P levels strongly indicated that a considerable amount of P was transported to plants via the mycorrhizal pathway under wetland conditions, although AMF colonization did not improve rice growth. This work provides the first solid evidence of C‒P exchange in AM symbiosis under flooded conditions, although it is reduced compared to non-flooded conditions. Nonetheless, this means that AMF may have an important function in wetlands, which opens new perspectives on the application of symbiotic AMF in wetlands.

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author
organization
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Contribution to journal
publication status
published
subject
keywords
Arbuscular mycorrhizal fungi (AMF), Carbon‒, Flooding, Growth (development) stage, Phosphorus exchange, Rice (Oryza sativa L.), Wetland
in
Soil Biology and Biochemistry
volume
129
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:85059320040
ISSN
0038-0717
DOI
10.1016/j.soilbio.2018.11.020
language
English
LU publication?
yes
id
969bb521-b16e-48de-802e-5cce9f85eca1
date added to LUP
2019-01-11 08:30:03
date last changed
2019-01-11 08:30:03
@article{969bb521-b16e-48de-802e-5cce9f85eca1,
  abstract     = {<p>Arbuscular mycorrhizal fungi (AMF) are commonly present in wetlands, but their functional role there is not well understood. We have quantified the carbon (C) allocation from rice to AMF under different flooding regimes, using stable isotope labeling (<sup>13</sup>CO<sub>2</sub>), and assessed the potential phosphorus (P) delivery from AMF to rice by profiling the expression of plant and fungal P transporter genes. The results showed that the plant-assimilated C was allocated to AMF under all flooding regimes, as evidenced by the significant enrichment of <sup>13</sup>C in the AMF signature fatty acids. The plant C allocation to AMF declined at increased flooding intensity, and was strikingly greater at the growth stage when the rice plants had a higher nutrient requirement. The gene expression profiles and rice P levels strongly indicated that a considerable amount of P was transported to plants via the mycorrhizal pathway under wetland conditions, although AMF colonization did not improve rice growth. This work provides the first solid evidence of C‒P exchange in AM symbiosis under flooded conditions, although it is reduced compared to non-flooded conditions. Nonetheless, this means that AMF may have an important function in wetlands, which opens new perspectives on the application of symbiotic AMF in wetlands.</p>},
  author       = {Bao, Xiaozhe and Wang, Yutao and Olsson, Pål Axel},
  issn         = {0038-0717},
  keyword      = {Arbuscular mycorrhizal fungi (AMF),Carbon‒,Flooding,Growth (development) stage,Phosphorus exchange,Rice (Oryza sativa L.),Wetland},
  language     = {eng},
  pages        = {169--177},
  publisher    = {Elsevier},
  series       = {Soil Biology and Biochemistry},
  title        = {Arbuscular mycorrhiza under water — Carbon‒phosphorus exchange between rice and arbuscular mycorrhizal fungi under different flooding regimes},
  url          = {http://dx.doi.org/10.1016/j.soilbio.2018.11.020},
  volume       = {129},
  year         = {2019},
}