Controlled ectomycorrhization of an exotic legume tree species Acacia holosericea affects the structure of root nodule bacteria community and their symbiotic effectiveness on Faidherbia albida, a native sahelian Acacia

Faye Aliou, Krasova-Wade Tatiana, Thiao Mansour, Thioulouse Jean, Neyra Marc, Prin Yves, Galiana Antoine, Ndoye Ibrahima, Dreyfus Bernard, Duponnois Robin. 2009. Controlled ectomycorrhization of an exotic legume tree species Acacia holosericea affects the structure of root nodule bacteria community and their symbiotic effectiveness on Faidherbia albida, a native sahelian Acacia. Soil Biology and Biochemistry, 41 (6) : 1245-1252.

https://doi.org/10.1016/j.soilbio.2009.03.004

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Quartile : Q1, Sujet : SOIL SCIENCE

Résumé : Many fast growing tree species have been introduced to promote biodiversity rehabilitation on degraded tropical lands. Although it has been shown that plant productivity and stability are dependent on the composition and functionalities of soil microbial communities, more particularly on the abundance and diversity of soil symbiotic micro-organisms (mycorrhizal fungi and rhizobia), the impact of tree introduction on soil microbiota has been scarcely studied. This research has been carried in a field plantation of Acacia holosericea (Australian Acacia species) inoculated or not with an ectomycorrhizal fungus isolate, Pisolithus albus IR100. After 7 year's plantation, the diversity and the symbiotic properties of Bradyrhizobia isolated from the plantation soil or from the surrounding area (Faidherbia albida (Del.) a. Chev. parkland) and able to nodulate F. albida, a native Sahelian Acacia species, have been studied. Results clearly showed that A. holosericea modified the structure of Bradyrhizobia populations and their effectiveness on F. albida growth. This negative effect was counterbalanced by the introduction of an ectomycorrhizal fungus, P. albus, on A. holosericea root systems. In conclusion, this study shows that exotic plant species can drastically affect genotypic and symbiotic effectiveness of native Bradyrhizobia populations that could limit the natural regeneration of endemic plant species such as F. albida. This effect could be counterbalanced by controlled ectomycorrhization with P. albus. These results have to be considered when exotic tree species are used in afforestation programs that target preservation of native plants and soil ecosystem rehabilitation.

Mots-clés Agrovoc : Acacia holosericea, Pisolithus, Faidherbia albida, Bradyrhizobium, symbiose, Mycorhizé, ectomycorhize

Mots-clés géographiques Agrovoc : Sénégal, Zone soudano-sahélienne

Mots-clés complémentaires : Pisolithus albus

Classification Agris : F62 - Physiologie végétale - Croissance et développement
P34 - Biologie du sol
P35 - Fertilité du sol
K10 - Production forestière

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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