Traits related to differences in function among three arbuscular mycorrhizal fungi
Traits related to differences in function among three arbuscular mycorrhizal fungi
Diversity in phosphorus (P) acquisition strategies was assessed among three species of arbuscular mycorrhizal fungi (AMF) isolated from a single field in Switzerland. Medicago truncatula was used as a test plant. It was grown in a compartmented system with root and root-free zones separated by a fine mesh. Dual radioisotope labeling (32P and 33P) was employed in the root-free zone as follows: 33P labeling determined hyphal P uptake from different distances from roots over the entire growth period, whereas 32P labeling investigated hyphal P uptake close to the roots over the 48 hours immediately prior to harvest. Glomus intraradices, Glomus claroideum and Gigaspora margarita were able to take up and deliver P to the plants from maximal distances of 10, 6 and 1 cm from the roots, respectively. Glomus intraradices most rapidly colonized the available substrate and transported significant amounts of P towards the roots, but provided the same growth benefit as compared to Glomus claroideum, whose mycelium was less efficient in soil exploration and in P uptake and delivery to the roots. These differences are probably related to different carbon requirements by these different Glomus species. Gigaspora margarita provided low P benefits to the plants and formed dense mycelium networks close to the roots where P was probably transiently immobilized. Numerical modeling identified possible mechanisms underlying the observed differences in patterns of mycelium growth. High external hyphal production at the root-fungus interface together with rapid hyphal turnover were pointed out as important factors governing hyphal network development by Gigaspora, whereas nonlinearity in apical branching and hyphal anastomoses were key features for G. intraradices and G. claroideum, respectively.
arbuscular mycorrhiza, extraradical mycelium, functional diversity, hyphal growth model, medicago truncatula, phosphorus
231-245
Thonar, Cécile
5adb5d1d-c650-4f9d-9422-02c79df250dc
Schnepf, Andrea
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Fossard, Emmanuel
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Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Jansa, Jan
a9ac516d-4ae3-4639-b6df-513d51f35e07
29 September 2011
Thonar, Cécile
5adb5d1d-c650-4f9d-9422-02c79df250dc
Schnepf, Andrea
b0b2f3f8-50ad-45b6-87b9-2a7ad4e5eca5
Fossard, Emmanuel
52d03de9-4a9f-4985-a7e3-33f605f994bc
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Jansa, Jan
a9ac516d-4ae3-4639-b6df-513d51f35e07
Thonar, Cécile, Schnepf, Andrea, Fossard, Emmanuel, Roose, Tiina and Jansa, Jan
(2011)
Traits related to differences in function among three arbuscular mycorrhizal fungi.
Plant and Soil, 339 (1-2), .
(doi:10.1007/s11104-010-0571-3).
Abstract
Diversity in phosphorus (P) acquisition strategies was assessed among three species of arbuscular mycorrhizal fungi (AMF) isolated from a single field in Switzerland. Medicago truncatula was used as a test plant. It was grown in a compartmented system with root and root-free zones separated by a fine mesh. Dual radioisotope labeling (32P and 33P) was employed in the root-free zone as follows: 33P labeling determined hyphal P uptake from different distances from roots over the entire growth period, whereas 32P labeling investigated hyphal P uptake close to the roots over the 48 hours immediately prior to harvest. Glomus intraradices, Glomus claroideum and Gigaspora margarita were able to take up and deliver P to the plants from maximal distances of 10, 6 and 1 cm from the roots, respectively. Glomus intraradices most rapidly colonized the available substrate and transported significant amounts of P towards the roots, but provided the same growth benefit as compared to Glomus claroideum, whose mycelium was less efficient in soil exploration and in P uptake and delivery to the roots. These differences are probably related to different carbon requirements by these different Glomus species. Gigaspora margarita provided low P benefits to the plants and formed dense mycelium networks close to the roots where P was probably transiently immobilized. Numerical modeling identified possible mechanisms underlying the observed differences in patterns of mycelium growth. High external hyphal production at the root-fungus interface together with rapid hyphal turnover were pointed out as important factors governing hyphal network development by Gigaspora, whereas nonlinearity in apical branching and hyphal anastomoses were key features for G. intraradices and G. claroideum, respectively.
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Published date: 29 September 2011
Keywords:
arbuscular mycorrhiza, extraradical mycelium, functional diversity, hyphal growth model, medicago truncatula, phosphorus
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Local EPrints ID: 184647
URI: http://eprints.soton.ac.uk/id/eprint/184647
PURE UUID: 9d18d30e-d358-4c5a-be57-3d2cdd851779
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Date deposited: 09 May 2011 08:39
Last modified: 15 Mar 2024 03:31
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Author:
Cécile Thonar
Author:
Andrea Schnepf
Author:
Emmanuel Fossard
Author:
Jan Jansa
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