Traits related to differences in function among three arbuscular mycorrhizal fungi

Traits related to differences in function among three arbuscular mycorrhizal fungi,10.1007/s11104-010-0571-3,Plant and Soil,Cécile Thonar,Andrea Schne

Traits related to differences in function among three arbuscular mycorrhizal fungi   (Citations: 3)
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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.
Journal: Plant and Soil - PLANT SOIL , vol. 339, no. 1, pp. 231-245, 2011
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    • ...In contrast to the detailed knowledge gathered in the past on the diversity of P uptake strategies of and benefits provided to the plants by different AM fungi (Jakobsen et al. 1992a; Jansa et al. 2005; Munkvold et al. 2004; Smith et al. 2004; Thonar et al. 2011), little is known about the C costs of AM symbiosis for the host plant...
    • ...Similar constraints (different biomass and P content between plants colonized by different AM fungal species and the non-mycorrhizal plants) and lack of isotopic C labeling also limited precise assessment of the C costs in a more recent study (Thonar et al. 2011)...
    • ...It is still possible that P delivery to the plant from Gigaspora is efficient, but slower or simply delayed as shown already by Jakobsen et al. (1992b )f orScutellospora, further discussed by Boddington and Dodd (1999) for various Gigasporaceae, or more recently demonstrated for the same isolate of G. margarita as in this study by Thonar et al. (2011)...
    • ...In this respect, it is probably important to mention that there is no proof that all the P measured in the root biomass was in the plant cells as the roots were generally well colonized by the fungi and some P was possibly still in the fungal biomass (this appears particularly the case for Gigaspora, see also Thonar et al. 2011), so the values for P benefits as shown in this study are somewhere between the net (P in the plants only) and ...

    Mark Lendenmannet al. Symbiont identity matters: carbon and phosphorus fluxes between Medica...

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