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Auteur Aboubacry Kane
Documents disponibles écrits par cet auteur
Affiner la rechercheThe 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
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 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité FT2400001 K030- FAL Article scientifique CNRF Dépot numérique Exclu du prêt Documents numériques
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ISSN : ISSN: 1532-4982
Langues : Anglais (eng) Langues originales : Français (fre)
Catégories : RESSOURCES NATURELLES ET ENVIRONNEMENT Mots-clés : champignons mycorhiziens arbusculaires croissance, casuarina equisetifolia communauté bactérienne Index. décimale : P342- Bactériologie et microbiologie du sol Résumé : Exotic trees are often planted to recover degraded lands. Inoculation with mycorrhizal fungi can improve their survival. Plant growth is partly dependent on the strain used, but little attention has been paid to the selection of mycorrhizal fungi. The aim of this study was to determine whether the growth of Casuarina equisetifolia L. (Johnson) is affected by two different mycorrhizal inocula generated using fungal spores retrieved from an Australian site (allochthonous soil) and a Senegalese site (native soil) under C. equisetifolia trees. Comparative experiments were conducted with plants in a Senegalese soil, previously sterilized or not, and grown in a greenhouse. At harvest, parameters related to plant growth and mycorrhization were evaluated and soil bacterial communities were compared. Tree growth was significantly influenced by both types of inoculants. In unsterilized soil, plants inoculated with the native inoculant were taller than plants inoculated with the allochthonous inoculant and control plants. The frequency of mycorrhization with both inoculants was higher in unsterilized soil. The strongest effects of the mycorhizosphere on the soil microbiome were obtained with the allochthonous inoculum, and analysis of the taxonomic composition revealed mycorrhizal communities specific to each inoculum. These results suggest that the development of C. equisetifolia and its root bacterial community are dependent on the composition of the mycorrhizal inoculum. The functional consequences of this rhizosphere effect in terms of soil fertility
should be further studied to better guide reforestation operations.Exemplaires
Code-barres Cote Support Localisation Section Disponibilité CN1903047 P342-DIA Article scientifique CNRA/Bambey Rayons Exclu du prêt Documents numériques
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Langues : Français (fre)
Catégories : RESSOURCES NATURELLES ET ENVIRONNEMENT Mots-clés : Jujubier, Sols dégradés, Mycorhizes, MA Rhizophagus irregularis IR27 Index. décimale : P351-Fertilité du sol et développement de la plante Exemplaires
Code-barres Cote Support Localisation Section Disponibilité KMS180003 P351-THI Fiches techniques CNRA/Bambey Dépot numérique Exclu du prêt Documents numériques
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Langues : Anglais (eng) Langues originales : Anglais (eng)
Catégories : SCIENCES ET PRODUCTIONS VEGETALES Mots-clés : Maladie des plantes, mildiou, mil, Kaolack, Kaffrine, Tambacounda, Sedhiou. Thiès, Diourbel, Fatick Index. décimale : H280-Maladie des plantes Résumé : Pearl millet is a dominant staple cereal crop for smallholder farmers in Senegal. However, the crop is constrained by various nonbiotic and biotic stresses such as downy mildew disease. To assess the prevalence of this disease in Senegal, a field survey was conducted during the rainy season of 2017 across eight main pearl millet production regions following latitudinal gradient with different climatic conditions. Results showed that downy mildew prevalence was higher in Kaolack (incidence = 68.19%), Kaffrine (incidence = 77.19%), Tambacounda (incidence = 97.03%), Sedhiou (incidence = 82.78%), and Kolda (incidence = 98.01%) than Thies (incidence = 28.21%), Diourbel (incidence = 24.46%), and Fatick (incidence = 37.75%) regions. The field survey revealed an incidence as high as 98% and 28% of infected area in surveyed fields. Significant correlations between geographic coordinates, disease incidence, and infected areas were also observed. This study provided information that could help to understand the prevalence of downy mildew in pearl millet in Senegal. En ligne : https://www.hindawi.com/journals/tswj/2019/1252653/ Exemplaires
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