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Détail de l'auteur
Auteur D. Diouf
Documents disponibles écrits par cet auteur
Affiner la rechercheJournal des Sciences et Technologies, N°7. Caractérisation phénotypique et symbiotique de souches de Mesorhizobiumsp. nodulantAcacia seyal (Del.). / D. Diouf
Journal des Sciences et Technologies, N°7. Caractérisation phénotypique et symbiotique de souches de Mesorhizobiumsp. nodulantAcacia seyal (Del.). [texte imprimé] / D. Diouf, Auteur ; I. Ndoye, Auteur ; D Fall, Auteur ; A. Kane, Auteur ; A.T. Bâ, Auteur ; M. Neyra, Auteur . - 2008 . - pp - 1-10.
Langues : Français (fre)
Catégories : FORESTERIE Mots-clés : Acacia seyal - caractérisation phénotypique - pouvoir symbiotique -Mesorhizobium spp. Résumé : Acacia seyal est une espèce hautement fixatrice d’azote. Cependant, peu de connaissances sont acquises sur la diversité phénotypique des rhizobia qui lui sont associés. Or, la survie et les qualités d’adaptation et de compétition des souches introduites peuvent être déterminantes dans la réponse des plantes à l’inoculation au champ. Des études de caractérisation phénotypique de 8 souches de Mesorhizobium spp. associées à A. seyal ont montré une grande diversité de leurs caractéristiques physiologiques et biochimiques. De plus, cette étude révèle une importante capacité d’adaptation des souches testées à divers stress. Le pouvoir symbiotique des souches a été étudié en serre dans des pots contenant du sol sableux non désinfecté. L’étude a montré que toutes les souches sont capables de noduler et d’améliorer la croissance des plants d’A. seyal. Cette étude est une contribution au développement de pratiques culturales et sylvicoles innovantes, en vue d’une meilleure utilisation du potentiel offert par les génotypes végétaux et leurs auxiliaires microbiens Exemplaires
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Cliquer pour voirURL Letters in Applied Microbiology, Vol 47, N° (2):. Phenotypic and genotypic characteristics of root-nodulating bacteria isolated from Acacia senegal(L. Wild.)in the dryland part of Senegal. / D Fall
Letters in Applied Microbiology, Vol 47, N° (2):. Phenotypic and genotypic characteristics of root-nodulating bacteria isolated from Acacia senegal(L. Wild.)in the dryland part of Senegal. [texte imprimé] / D Fall, Auteur ; D. Diouf, Auteur ; M Ourarhi, Auteur ; A. Faye, Auteur ; H Abdelmoumen, Auteur ; M. Neyra, Auteur ; S.N Sylla, Auteur ; M Missbah El Idrissi, Auteur . - 2008 . - pp - 85-97.
Langues : Anglais (eng)
Catégories : FORESTERIE Résumé : We characterized phenotypically and genotypically root-nodulating bacteria associated with Acacia senegal (L.) Willd. isolated from the soils surrounding A. senegal trees in the dry land area of Senegal Methods and Results: The phenotypical and genotypical characterizations we carried out showed a high diversity of A. senegal root-nodulating bacteria. Phenotypic patterns showed adaptations of the rhizobial strains to many environmental stresses such as heat, drought, and salinity. Twelve molecular groups were distinguished by profiles obtained using polymerase chain reaction ⁄ restriction fragment length polymorphism techniques from intergenic spacer region rDNA. The highest genetic diversity was found around the A. senegal rhizosphere. Therefore, A. senegal seemed to have a positive influ- ence on occurrence and genotypical diversity of rhizobial populations. Rhizobial isolates obtained in this study belonged phylogenetically to the genera Mesorhizobium and Rhizobium. Our results provided information about the genetic diversity of the rhizobial strains associated with A. senegal and suggested the adaptability of natural rhizobial populations to major ecological environmental stress within these soil environments. These results suggested a potential selection of compatible and well adapted strains under stress conditions as inocu- lants for successful A. senegal growth in arid lands. Exemplaires
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Cliquer pour voirURL Open Journal of Forestry, Vol 4, N° (2),. . Distribution and Diversity of Rhizobial Populations Associated with Acacia senegal (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions / N Bakhoum
Open Journal of Forestry, Vol 4, N° (2),. . Distribution and Diversity of Rhizobial Populations Associated with Acacia senegal (L.) Willd. Provenances in Senegalese Arid and Semiarid Regions [texte imprimé] / N Bakhoum, Auteur ; C Le Roux, Auteur ; D. Diouf, Auteur ; A. Kane, Auteur ; F Ndoye, Auteur ; D Fall, Auteur ; R Duponnois, Auteur ; K Noba, Auteur ; S.N Sylla, Auteur ; A Galiana, Auteur . - 2014 . - pp-136-143.
Langues : Anglais (eng)
Catégories : FORESTERIE Mots-clés : Acacia senegal Mesorhizobium Diversity Symbiosis Ecology Phylogeny Résumé : Distribution and diversity of rhizobial strains associated with Acacia senegal (L.) Willd. in relation to seed provenances in soils from arid (Dahra) and semiarid (Goudiry) zones of Senegal were inves- tigated. PCR-RFLP performed on 16S-23S rDNA intergenic spacer (IGS) of nodule crude extracts re- vealed a high genetic diversity of rhizobial strains, which was higher in the semiarid region than in the arid region. The distribution of rhizobial populations was influenced by soil physical and chemical char- acteristics, and by A. senegal provenances as shown by the analysis of correspondence. In contrast, the phenotypic diversity of rhizobial strains was not correlated with the soil origin. The phylogenetic tree (performed by the maximum likelihood algorithm) of IGS 16S-23S sequences showed that most of the rhizobial strains nodulating A. senegal were closely related to Mesorhizobium plurifarium. Our results showed that rhizobial taxa associated with A. senegal were mainly distributed according to soil physical and chemical characteristics, and A. senegal provenances. A large subset of A. senegal root-nodulating bacteria had high diversity that correlated with the most favourable environmental conditions. Understanding the diversity and distribution of rhizobial strains may be exploited in the formulation of A. senegal inoculants for different seed provenances for resilience to soil stresses in various environmental conditions. Exemplaires
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Cliquer pour voirURL Plant and Soil, N°398. Senegalia Senegal response to inoculation with rhizobial strains vary in relation to seed provenance and soil type / N Bakhoum
Plant and Soil, N°398. Senegalia Senegal response to inoculation with rhizobial strains vary in relation to seed provenance and soil type [texte imprimé] / N Bakhoum, Auteur ; D.W Odee, Auteur ; Dioumacor Fall, Auteur ; F Ndoye, Auteur ; A. Kane, Auteur ; J.M Kimiti, Auteur ; A.M Zoubeirou, Auteur ; S.N Sylla, Auteur ; K Noba, Auteur ; D. Diouf, Auteur . - 2016 . - pp181-193.
Langues : Anglais (eng)
Catégories : FORESTERIE Mots-clés : Senegal, Provenance variation, Environmental conditions . Inoculation, Acacia, Mesorhizobium, Senegal, Rhizobia Index. décimale : K030- Génétique et amélioration des plantes Résumé : The focus of the study was to determine the symbiotic and growth response of three Senegalia Senegal (Syn. Acacia Senegal, gum arabic tree) provenances, namely Dahra (Senegal), Tera (Niger) and Makueni (Kenya)
to inoculation with selected S. Senegal nodulating rhizobia in soils from Dahra and Goudiry regions of Senegal, representing typical soil and enviromental conditions for establishing gum arabic production plantations. A greenhouse experiment was performed to evaluate the effect of 11 rhizobial strains on nodulation and growth of three S. Senegal provenances in two field soils, differing in nutrient status and indigenous rhizobia. After 4 months, plants were harvested for determination of nodulation, shoot and root dry weight. Nodulation and growth of S. Senegal var- ied in relation to rhizobial strain, provenance, soil type, and their interactions. Generally, nodulation was higher in Dahra than Goudiry soils, while Makueni provenance was the most compatible host. Inoculation had a significant effect on all parameters measured in Dahra field soil. By contrast, inoculation had a significant effect on height (shoot length), and shoot, root and total dry matter but not on nodulation. In the two field soils, seed provenance effect was significant for all parameters measured. The interaction between inoculation and provenance showed a significant effect on all parameters measured except nodule number in Dahra field soil while in Goudiry, the interaction had a significant effect on seedling height and shoot, root, and total dry matter but this effect was not significant with nodulation parameters. S. Senegal is variable in its response to inoculation, it is therefore advantageous to select and match effective rhizobia provenance symbionts for each site.Exemplaires
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Cliquer pour voirURL PLOS 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
PermalinkSpringer Science Business Media Dordrecht. Genetic diversity of Jatropha curcas L. in Senegal compared with exotic accessions based on microsatellite markers / Ouattara, B
PermalinkSymbiosis, 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
PermalinkSystematic 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
PermalinkWorld 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
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