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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

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AABNF 2008 - December 15°-I8r', 2008 - Na nmamet-Tunisia

Sate Work. Myron Poster 2

Controlled ectomycorrhization of an exotic legume tree species Acaciaholosericea affects root nodule

bacteria diversity and their symbiotic effectiveness on Faidherbia albida, a native sahelianAcacia

Faye A'P2,Krasova-Wade T 2, Thiao NI2-2 , Thioulouse J4, Neyra M', Prin

GalianaA `, NDoye 1 2„', Dreyfus B s & Duponnois R 2'' * ' ISRA. Laboratoire National de Recherches sur les Productions Végétales. Centre de Recherche de Bel Air . BP 1386 . Dakar . Sénégal ; 2

IRD . Laboratoire Commun de Microbiologie IRD/ISRAIUCAD. Centre de Recherche de Bel Air. BP 1386 . Dakar . Sénégal ; UCAD, Faculté des Sciences et Techniques, Département de biologie végétale, Dakar, Sénégal ; Laboratoire de Biométrie et Biologie Evolutiv e

(UMR 5558) ; CNRS ; Univ . Lyon 1, 43 bd 11 nov, 69622, Villeurbanne Cedex, France ;' IRD . UMR 113 CIRADIINRAIIRD/SUP-AGRO/UM2 . Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM). TAIO/J, Campus International de Baillarguet .

Montpellier. France ; ` CIRAI_ UMR 113 CIRADIINRA/IRDISUP-AGRO/UM2 . Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM) . TA10/J, Campus International de Baillarguet, Montpellier, Franc e

E-mail : duponnoigird

In the 400-700 mm rainfall zone, Acacia holosericea was found to be one of the best-adapted exotic tre e

showing excellent survival rate and rapid early growth (Harwood, 1994) . In addition to rhizobial symbiosis, thi s tree species can form arbuscular mycorrhiza (AM) andlor ectomycorrhiza (De La Cruz & Garcia. I991 , Founoune et al ., 2002) and controlled mycorrhizal inoculation could improve its performance in glasshous e conditions (Duponnois et al ., 2000a, 2001, 2003) &Id also after outplanting into the field (Duponnois et al ., 2005, 2007) . The impact of the establishment of exotic plant on the structure and function of native microbia l communities was mainly unknown . Hence a study was conducted in a field experiment carried out in Senega l with A . holosericea, inoculated or not with an ectomycorrhizal strain Pisolithus albus IR 100 (Duponnois et al ., 2005, 2007) in order to evaluate the influence of this exotic fast growing leguminous tree on the native soi l microbiota and the potential consequences on soil revegetalisation with native plant species . Among the targete d native species, the leguminous tree Faidherbia albida has been selected since it plays a major role in the agro-sylvo-pastoral balance of the Sahelian regions of Africa . Our study shows that exotic plant species ca n drastically affect the genotypic and symbiotic effectiveness of native bradyrhizobia populations which coul d limit the natural regeneration of endemic plant species such as F. albida. But this field-base experimental research outlights the role of mycorrhizal symbiosis in afforestation programmes with exotic tree species tha t target preservation of native plants .

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Figure 2: Results from experimental plots showing relationship between aboveground biomass (filled circle and solid line) and number of surviving plants (open circle and dashed line)