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Response of Acacia senegal (L.) Willd. to inoculation with arbuscular mycorrhizal fungi isolates in sterilized and unsterilized soils in Senegal |
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| Authors: | Fatou Ndoye Aboubacry Kane Niokhor Bakhoum Arsène Sanon Dioumacor Fall Diégane Diouf Samba Ndao Sylla Amadou Mustapha Bâ Mame Ourèye Sy Kandioura Noba |
| Institution: | 1. Département de Biologie Végétale, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, BP 5005, Dakar-Fann, Senegal 2. Laboratoire Commun de Microbiologie (IRD/ISRA/UCAD), Centre de Recherche de Bel-Air, BP 1386, 18524, Dakar, Senegal 3. Institut de Recherche pour le Développement (IRD), Centre de Ouagadougou, 01 BP 182, Ouagadougou, Burkina Faso 4. Institut Sénégalais de Recherches Agricoles (ISRA), Centre National de Recherches Forestières (CNRF), Route des Pères Maristes, BP 2312, Dakar, Senegal 5. Laboratoire Campus de Biotechnologies Végétales, Département de Biologie Végétale, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, BP 5005, Dakar-Fann, Senegal |
| Abstract: | The benefits of inoculation with six arbuscular mycorrhizal fungi (AMF) isolates (Glomus aggregatum, G. fasciculatum, G. intraradices, G. manihotis, G. mosseae, and G. verriculosum) were investigated on seedlings of Acacia senegal (L.) Willd., a multipurpose tree legume highly valued for arabic gum production. Mycorrhizal root colonization, plant growth and relative mycorrhizal dependency (RMD) were measured in A. senegal seedlings growing in soils from three geographical sites in Senegal (Dahra, Bambey and Goudiry) and two soil conditions (sterilized vs unsterilized) in the glasshouse. The impact of inoculation on mycorrhizal root colonization and plant growth depended on AMF isolates, soil origins and soil conditions. Mycorrhizal root colonization and plant growth were increased in sterilized soils regardless of soil origin and AMF isolates. The degree of RMD of A. senegal seedlings varied with soil origin, soil condition and AMF isolates. A. senegal showed the highest RMD values, reaching a maximum of 45 %, when inoculated with G. manihotis. However, in unsterilized soils, no significant effect of AMF inoculation on plant growth was observed despite significant root colonization with certain AMF isolates in Dahra and Goudiry soils. This indicates that the most infective AMF isolates were not the most effective and unsterilized soils may contain effective mycorrhizal propagules. In conclusion, it is important to consider the native mycorrhizal component of the soils before harnessing mycorrhizal inoculation programs for sustainable agroforestry systems. |
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