Influence of soil fertility on the rhizobial competitiveness for nodulation of <Emphasis Type="Italic">Acacia senegal</Emphasis> and <Emphasis Type="Italic">Acacia nilotica</Emphasis> provenances in nursery and field conditions |
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Authors: | A Sarr D Lesueur |
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Institution: | (1) Programmes Arbres et Plantations du CIRAD-Forêt, Laboratoire Commun de Microbiologie (IRD/UCAD/ISRA), Centre de Bel Air, BP 1386, Dakar, Senegal;(2) Present address: UMR Microbiologie et de Géochimie des Sols INRA Dijon, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France;(3) Forest Department of CIRAD, UPR “ETP”, Tropical Soil Biology and Fertility Institute of CIAT, World Agroforestry Centre, P.O. Box 30677, Nairobi, Kenya |
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Abstract: | Within the framework of our study, we assessed the nodule occupancy of a mixture of various strains of rhizobia to inoculate
several provenances of Acacia senegal and Acacia nilotica. The first part of the experiment was carried out under greenhouse conditions where the plants were cultivated in polyvinyl
chloride tubes containing an unsterilized Sangalkam soil low in organic matter and nitrogen. The results showed that 4 and
8 months after sowing, rhizobial strains CIRADF 306 and CIRADF 300 were mainly present in nodules of A. nilotica and A. senegal, respectively. After transferring the seedlings to the more fertile soil in Bel Air field station, the molecular analysis
of the nodules showed that strain CIRADF 306 was absent from the nodules of A.
nilotica, whereas strain CIRADF 305 which occurred only at low nodule occupancy in the nursery, predominated in the field conditions.
On the other hand, strain CIRADF 300 occurred in the majority of the nodules from the various provenances of A. senegal. These results demonstrated actual interaction between inoculated rhizobial strains, soil type and host plant genotype in
terms of competitiveness, nodulation and symbiotic nitrogen fixation. |
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Keywords: | Acacia provenances Nodules occupancy PCR-RFLP Rhizobia Soil fertility |
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