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The rhizosphere of the halophytic grass Sporobolus robustus Kunthhosts rhizobium genospecies that are efficient on Prosopis juliflora(Sw.) DC and Vachellia seyal (Del.) P.J.H. Hurter seedlings / Fatoumata Fall 

The rhizosphere of the halophytic grass Sporobolus robustus Kunthhosts rhizobium genospecies that are efficient on Prosopis juliflora(Sw.) DC and Vachellia seyal (Del.) P.J.H. Hurter seedlings [texte imprimé] / Fatoumata Fall, Auteur ; Christine Le Roux, Auteur ; Amadou Mustapha Bâ, Auteur ; Dioumacor Fall, Auteur ; Niokhor Bokhoum, Auteur ; Mathieu Ndigue Faye, Auteur ; Aboubacry Kane, Auteur ; Ibrahima Ndoye, Auteur ; Diegane Diouf, Auteur . - 2018 . - 8 : tab ; diagramm ; ref. Langues : Anglais (eng) Catégories : FORESTERIE Mots-clés : Nurse plant, Salt tolerance, Nitrogen fixation, Phylogeny, Bioremediation Index. décimale : K030- Génétique et amélioration des plantes Résumé : tThe aim of this study was to survey the abundance and genetic diversity of legume-nodulating rhizobia(LNR) in the rhizosphere of a salt-tolerant grass, Sporobolus robustus Kunth, in the dry and rainy seasonsalong a salinity gradient, and to test their effectiveness on Prosopis juliflora (SW.) DC and Vachellia seyal(Del.) P.J.H. Hurter seedlings. The results showed a significant decrease in LNR population density anddiversity in response to salinity, particularly during the dry season. A phylogenetic analysis of the 16S-23SrRNA ITS region clustered the 232 rhizobium isolates into three genera and 12 distinct representativegenotypes: Mesorhizobium (8 genotypes), Ensifer (2 genotypes) and Rhizobium (2 genotypes). Of thesegenotypes, 2 were only found in the dry season, 4 exclusively in the rainy season and 6 were found in bothseasons. Isolates of the Mesorhizobium and Ensifer genera were more abundant than those of Rhizobium,with 55%, 44% and 1% of the total strains, respectively. The abundance of the Mesorhizobium isolatesappeared to increase in the dry season, suggesting that they were more adapted to environmental ariditythan Ensifer genospecies. Conversely, Ensifer genospecies were more tolerant of high salinity levels thanthe other genospecies. However, Ensifer genospeciesproved to be the most efficient strains on P. julifloraand V. seyal seedlings. We concluded that S. robustus hosts efficient rhizobium strains in its rhizosphere,suggesting its ability to act as a nurse plant to facilitate seedling recruitment of P. juliflora and V. seyal insaline soils

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