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Is the release of acid phosphatases by ectomycorrhizal fungi a matter of environmental conditions or species in situ?

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HAL Id: hal-02744440

https://hal.inrae.fr/hal-02744440

Submitted on 3 Jun 2020

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Is the release of acid phosphatases by ectomycorrhizal

fungi a matter of environmental conditions or species in

situ?

Claude Plassard, Muhhammad A. Ali, Myriam Duchemin, Elvira

Legname-Vonarx, Julien Louche, Benoît Cloutier-Hurteau

To cite this version:

Claude Plassard, Muhhammad A. Ali, Myriam Duchemin, Elvira Legname-Vonarx, Julien Louche, et al.. Is the release of acid phosphatases by ectomycorrhizal fungi a matter of environmental conditions or species in situ?. Rhizosphere 3, 2011, Perth, Australia. 2011. �hal-02744440�

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IS THE RELEASE OF ACID PHOSPHATASES BY ECTOMYCORRHIZAL FUNGI A MATTER OF SPECIES OR ENVIRONMENTAL CONDITIONS ?

Claude Plassard INRA-Eco&Sols

2, Place Viala, Montpellier, France plassard@supagro.inra.fr

Muhhammad A. Ali, Myriam Duchemin, Elvire Legname, Julien Louche, Benoît Cloutier-Hurteau

INRA-Eco&Sols

2, Place Viala, Montpellier, France

Aims and Background

Ectomycorrhizal (ECM) fungi are able to release significant amounts of phosphatases (Pases) in their environment. These enzymes, by releasing the phosphate group of organic P, may play an important role in the recycling of P in forest soil. However, whether this enzyme release depends on the fungal diversity and / or the nutrient availability is not known.

We addressed this question in the maritime pine (Pinus pinaster) forest, the first planted area in France on sandy podzol very poor in nutrient, especially P.

Methods

We studied the diversity of ECM species associated with trees grown in experimental plots with contrasting N and P availability, whether or not irrigated. Pase activities were measured out on individual ECM tips sampled over two years, at 3 occasions. Tips were then identified from ITS sequencing.

Results

Pase activities were primarily dependent on the fungal species and very little on the treatment, especially P availability. The fungal community was dominated by two species, presenting the highest (Lactarius hepaticus) and the lowest (Inocybe nitidiuscula) Pase activities of the whole community. However, I. nitidiuscula was dominant in plots with high mineral P availability.

Conclusion

Références

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