Functional diversity of rhizobia associated to Acacia senegal in different gum basins in Niger.
Publication Date : 05/04/2020
This study was carried out in six (6) natural gum groves in three gum basins of Niger, namely Kiki and Kokoiye in the western gum basin, Bader Goula and Azzaï in the central gum basin and Malam Mainari and N’Guel Kolo in the eastern gum basin. The objective of this study is to determine the functional diversity of rhizobia associated with A. senegal. For this, the number of rhizobia nodulating A. senegal was determined by the technique of trapping in Gibson tubes and in greenhouse with seeds from six (6) natural gum groves. The infective capacity of soils was tested by inoculating plants with gum grove’soils in Gibson tube. The rhizobial infectious potential of soils was determined using the method of Vincent, (1970). Results showed a variation in nodulation according to type of soil due to the natural presence of rhizobia in soils of gum groves. The soil of N’Guel kolo’s had the most nodulation unlike that of Kiki and this as well in greenhouse as in Gibson tube. The distribution of rhizobium populations able to form nodules with A. senegal was correlated with soil’s origin, in particular the physicochemical composition and provenance of seeds. This study also made it possible to observe nodulation whatever the combination origin of seed and soil. This will allow to create a local inoculum that can boost young plants growing and promote the success of reforestation programs in Niger. Keywords: rhizobium, infectious potential, Acacia senegal, gum groves, Niger.
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