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Response of Acacia senegal (L.) Willd. seedlings and soil bio-functioning to inoculation with arbuscular mycorrhizal fungi, rhizobia and Pseudomonas fluorescens

Acacia senegal (L.) Willd. is a multipurpose legume that is economically and ecologically important in Sahelian areas. The effects of arbuscular mycorrhizal fungal (AMF) inoculum (M) individually and in combination with rhizobia (R) and Pseudomonas fluorescens (Pf) were investigated on the growth and nutrition of A. senegal seedlings. In glasshouse conditions, all the inocula except Pf significantly enhanced A. senegal plant growth after 6 months in a non-sterile soil from Dahra (Senegal). However, no significant increase in shoot N content was recorded, whereas the application of MR, MPf and MRPf significantly improved shoot P content, and that of MR and MPf, shoot K content. The nodule number was significantly augmented by rhizobial inoculation and the root mycorrhizal colonization rate by MR, MPf and MRPf treatments. Soil spore density was increased by all inoculants except MPf, and soil AMF hyphal length by M, R and MRPf treatments. The inoculation with Pseudomonas and MPf significantly stimulated soil acid phosphatase activity, but no significant effect was observed on soil fluorescein diacetate (FDA) activity. Thus, the dual inoculation with AMF and R can be beneficial to A. senegal growth under non-sterile soil, where nutrients particularly P and N are often deficient.

Auteur(s) : Ndoye F, Kane A, Bakhoum N, Sanon A, Fall D, Diouf D, Sy MO, Noba K
Pages : 7176-7184
Année de publication : 2012
Revue : African Journal of Microbiology Research
N° de volume : 6 (44)
Type : Article
Mise en ligne par : DIOUF Diégane