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Distribution and Diversity of Rhizobial Populations Associated with <i>Acacia senegal</i>(L.) Willd. Provenances in Senegalese Arid and Semiarid Regions

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Open Journal of Forestry 2014年第2期4卷 136-143页

作者： Niokhor Bakhoum Christine Le Roux Diégane Diouf aboubakry kane Fatou Ndoye Dioumacor Fall Robin Duponnois Kandioura Noba Samba Ndao Sylla Antoine Galiana Baillarguet Research Center UMR 113 IRD/CIRAD UMR82/AGRO-M/UM2 USC INRA 1242 Laboratory of Tropical and Mediterranean Symbioses (LSTM) Montpellier France Bel-Air Research Center IRD/ISRA/UCAD Common Microbiology Laboratory (LCM) Dakar Senegal Bel-Air Research Center IRD/ISRA/UCAD Common Microbiology Laboratory (LCM) Dakar Senegal National Centre of Forest Research (CNRF)/Senegalese Institute of Agricultural Research (ISRA) Dakar Senegal Plant Biology Department Cheikh Anta Diop University of Dakar (UCAD) Dakar Senegal Bel-Air Research Center IRD/ISRA/UCAD Common Microbiology Laboratory (LCM) Dakar Senegal

Abstract: 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 investigated. PCR-RFLP performed on 16S-23S rDNA intergenic spacer (IGS) of nodule crude extracts revealed 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 characteristics, 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.

关键词： Acacia senegal Mesorhizobium Diversity Symbiosis Ecology Phylogeny

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Epidemiological, Clinical and Outcome Aspects of Care-Related Tetanus in Dakar, Senegal

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Advances in Infectious Diseases 2022年第2期12卷 230-240页

作者： Viviane Marie Pierre Cisse Ndèye Fatou Ngom Gueye Louise Fortes Imelda Mickelina Thoo Aminata Massaly Khardiata Diallo Mbaye Daye Ka Ndèye Aissatou Lakhe Assane Diouf Ndèye Maguette Fall Daouda Thioub aboubakry Sidikh Badiane Latyr Junior Diouf Alassane Sarr Sylvie Audrey Diop Cheikh Tidiane Ndour Masserigne Soumaré Moussa Seydi Infectious and Tropical Diseases Department Fann Teaching University Hospital Dakar Senegal Department of Community Health Alioune Diop University Bambey Senegal Department of Health Thies University Thies Senegal

Introduction: Tetanus portals of entry are numerous. Amongst these, the carerelated portals of entry are rarely reported. The aim of the study was to describe the epidemiological, clinical and outcome aspects and identify the factors associated with death from care-related tetanus. Patients and Methods: This is a retrospective study of descriptive and analytical purposes. Data were collected from the medical records of patients admitted to the Infectious and Tropical Diseases Department of the National University Hospital Center (CHNU) of Fann in Dakar for care-related tetanus during the period ranging from 1 January 2009 to 31 December 2016. Care-related tetanus was defined as any case of tetanus occurring after a surgical procedure, including circumcisions performed even outside a health facility. Results: In eight years, 50 cases of care-related tetanus were recorded. Care-related tetanus accounted for 6.7% of hospitalized tetanus cases. The mean age of patients was 21 ± 22 years, with a male predominance (sex ratio: 6.14). The procedure had been performed in most cases, either in a health facility in 22 patients (44%) or at home in 16 patients (32%), and occurred after circumcision. In 62% of cases the portal of entry was urological, followed by orthopedic surgery (14%) and visceral surgery (10%). The procedures performed were dominated by circumcision (31 cases), limb amputation (3 cases) and inguinal hernia repair (2 cases). Tetanus was immediately generalized on admission in all patients. Eighty-four percent (84%) of patients were admitted with Mollaret stage II. Cardiovascular (11 cases), infectious (10 cases) and respiratory (9 cases) complications were the most frequent. The hospital case fatality rate was 24%. Factors associated with death were female gender (p = 0.03), age between 15 - 60 years (p = 0.02), incubation time Conclusion: Care-related tetanus remains a concern in poor income countries, particularly in Senegal. The drop of these cases will req

关键词： Tetanus Care Surgery Dakar Senegal

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