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Détail de l'auteur
Auteur D Fall
Documents disponibles écrits par cet auteur
Affiner la recherchePLOS ONE, In press. Genetic and GenomicDiversityStudies of AcaciaSymbionts in Senegal Reveal New Species of Mesorhizobiumwith a Putative Geographical Pattern / F Diouf
PLOS ONE, In press. Genetic and GenomicDiversityStudies of AcaciaSymbionts in Senegal Reveal New Species of Mesorhizobiumwith a Putative Geographical Pattern [texte imprimé] / F Diouf, Auteur ; D. Diouf, Auteur ; A Klonowska, Auteur ; A Le Queré, Auteur ; N Bakhoum, Auteur ; D Fall, Auteur ; M Neyra, Auteur ; H Parrinello, Auteur ; I. Ndoye, Auteur ; L Moulin, Auteur . - 2015.
Langues : Anglais (eng)
Catégories : FORESTERIE Mots-clés : Acacia Sénégal Index. décimale : K30-Génétique et amélioration des plantes forestiéres Résumé : Acacia senegal (L) Willd. and Acacia seyal Del. are highly nitrogen-fixing and moderately salt tolerant species. In this study we focused on the genetic and genomic diversity of Acacia mesorhizobia symbionts from diverse origins in Senegal and investigated possible correla- tions between the genetic diversity of the strains, their soil of origin, and their tolerance to sa- linity. We first performed a multi-locus sequence analysis on five markers gene fragments on a collection of 47 mesorhizobia strains of A. senegal and A. seyal from 8 localities. Most of the strains (60%) clustered with the M. plurifarium type strain ORS 1032T, while the others form four new clades (MSP1 to MSP4). We sequenced and assembled seven draft genomes: four in the M. plurifarium clade (ORS3356, ORS3365, STM8773 and ORS1032T), one in MSP1 (STM8789), MSP2 (ORS3359) and MSP3 (ORS3324). The average nucleotide identities be- tween these genomes together with the MLSA analysis reveal three new species of Mesorhi- zobium. A great variability of salt tolerance was found among the strains with a lack of correlation between the genetic diversity of mesorhizobia, their salt tolerance and the soils samples characteristics. A putative geographical pattern of A. senegal symbionts between the dryland north part and the center of Senegal was found, reflecting adaptations to specific local conditions such as the water regime. However, the presence of salt does not seem to be an important structuring factor of Mesorhizobium species. Exemplaires
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Cliquer pour voirURL South African Journal of Botany, Vol 119. ). Senegalia senegal (synonym: Acacia senegal), its importance to sub-Saharan Africa, and its relationship with a wide range of symbiotic soil microorganisms. / N Bakhoum
South African Journal of Botany, Vol 119. ). Senegalia senegal (synonym: Acacia senegal), its importance to sub-Saharan Africa, and its relationship with a wide range of symbiotic soil microorganisms. [texte imprimé] / N Bakhoum, Auteur ; D Fall, Auteur ; F Fall, Auteur ; F Diouf, Auteur ; A.M Hirsch, Auteur ; D Balachandar, Auteur ; D. Diouf, Auteur . - 2018 . - pp-362-368.
Langues : Anglais (eng)
Catégories : FORESTERIE Exemplaires
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Cliquer pour voirURL Symbiosis, Vol 54, N° (2):. The efficiency and competitiveness of three Mesorhizobium sp. strains nodulatingAcacia senegal (L.) Willd. under water deficiency conditions in the greenhouse / D Fall
Symbiosis, Vol 54, N° (2):. The efficiency and competitiveness of three Mesorhizobium sp. strains nodulatingAcacia senegal (L.) Willd. under water deficiency conditions in the greenhouse [texte imprimé] / D Fall, Auteur ; M Ourarhi, Auteur ; M Missbah El Idrissi, Auteur ; N Bakhoum, Auteur ; A.M Zoubeirou, Auteur ; H Abdelmoumen, Auteur ; D. Diouf, Auteur . - 2011 . - pp - 87-94.
Langues : Anglais (eng)
Catégories : FORESTERIE Mots-clés : Acacia senegal, Mesorhizobium sp., Abiotic factors, Rhizobial inoculation, Drought, Competitiveness Résumé : The combined effects of drought and salinity were investigated on the growth, efficiency and competi- tiveness of three Mesorhizobium sp. strains (ORS 3416, ORS 3428 and ORS 3437) isolated from Acacia senegal (L.) Willd. Sixteen combinations of polyethylene glycol (PEG) 6000 (0, 6, 12, 20%, w/v) and NaCl (0.005, 0.5, 1, 1.5%, w/v) were used to study rhizobial strains growth in screw-capped tubes containing yeast extract mannitol liquid medium. Whatever the combination, the strains grew. However, high concentrations of PEG 6000 and NaCl were depressed on rhizobial growth but strain ORS 3428 was the most tolerant. The effect of rhizobial inoculation on growth of A. senegal plants was also examined under non-limited (100% of water holding capacity, WHC) and water-limited onditions (50% WHC) in the greenhouse for 4 months on non-sterile sandy soil. A significant decrease in the nodula- tion rate, nodule dry weight, plant height and shoot dry weight was observed under water-limited conditions. Never- theless, inoculation with the three selected Mesorhizobium strains significantly improved nodulation and A. senegal plant growth under water-limited conditions. Whatever the irrigation condition, strains ORS 3428 and ORS 3437 were more competitive than ORS 3416. These rhizobial strains may prove valuable for inoculation of Acacia senegal plants grown for transplantation to dry saline habitats. Exemplaires
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Cliquer pour voirURL Systematic and Applied Microbiology,, Vol 42, n°(2):. The rhizosphere of the halophytic grass Sporobolus robustus Kunth hosts rhizobium genospecies that are efficient on Prosopis juliflora (Sw.) DC and Vachellia seyal (Del.) seedlings. / F Fall
Systematic and Applied Microbiology,, Vol 42, n°(2):. The rhizosphere of the halophytic grass Sporobolus robustus Kunth hosts rhizobium genospecies that are efficient on Prosopis juliflora (Sw.) DC and Vachellia seyal (Del.) seedlings. [texte imprimé] / F Fall, Auteur ; Bâ A.M., Auteur ; C Le Roux, Auteur ; D Fall, Auteur ; N Bakhoum, Auteur ; M.N Faye, Auteur ; A. Kane, Auteur ; I. Ndoye, Auteur ; D. Diouf, Auteur . - 2019 . - pp-232-239.
Langues : Anglais (eng)
Catégories : FORESTERIE Exemplaires
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Cliquer pour voirURL World Journal of Microbiology and Biotechnology, N°28:. Impact of rhizobial inoculation on Acacia senegal (L.) Willd. growth in greenhouse and soil functioning in relation to seed provenance and soil origin. / N Bakhoum
World Journal of Microbiology and Biotechnology, N°28:. Impact of rhizobial inoculation on Acacia senegal (L.) Willd. growth in greenhouse and soil functioning in relation to seed provenance and soil origin. [texte imprimé] / N Bakhoum, Auteur ; F Ndoye, Auteur ; A. Kane, Auteur ; K Assigbetsé, Auteur ; D Fall, Auteur ; S.N Sylla, Auteur ; K Noba, Auteur ; D. Diouf, Auteur . - 2012 . - pp- 2567-2579.
Langues : Anglais (eng)
Catégories : FORESTERIE Mots-clés : Rhizobial inoculation, Acacia senegal, Environment, Microbial diversity, Soil biofunctioning, Fertility Résumé : Rhizobial inoculation has a positive impact on plants growth; however, there is little information about its effect on soil microbial communities and their activity in the rhizosphere. It was therefore necessary to test the effect of inoculation of Acacia senegal (L.) Willd. seedlings with selected rhizobia on plant growth, structure and diversity of soil bacterial communities and soil functioning in relation to plant provenance and soil origin. In order to carry out this experiment, three A. senegal seeds provenance from Kenya, Niger, and Senegal were inoculated with selected rhizobial strains. They have been further grown during 4 months in greenhouse conditions in two non-disinfected soils, Dahra and Goudiry coming respectively from arid and semi-arid areas. The principal component analysis (ACP) showed an inoculation effect on plant growth, hizospheric bacterial diversity and soil functioning. However, the performances of the rhizobial strains varied in relation to the seed provenance and the soil origin. The selected rhizobial strains, the A. senegal provenance and the soil origin have modified the structure and the diversity of soil bacterial communities as measured by principal component analysis/denaturing gradient gel electrophoresis analyses. It is interesting to note that bacterial communities of Dahra soil were highly structured according to A. senegal provenance, whereas they were structured in relation to rhizobial inoculation in Goudiry soil. Besides, the impact of inoculation on soil microbial activities measured by fluorescein diacetate analyses varied in relation to plant provenance and soil origin. Nevertheless, total microbial activity was about two times higher in Goudiry, arid soil than in Dahra, semi-arid soil. Our results suggest that the rhizobial inoculation is a suitable tool for improving plants growth and soil fertility. Yet, the impact is dependent on inoculants, plant provenance and soil origin. It will, therefore, be crucial to identify the appropriate rhizobial strains and plant provenance or species in relation to the soil type. Exemplaires
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