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Ngom M.,Cheikh Anta Diop University | Ngom M.,Laboratoire Communications Of Microbiologie Ird Isra Ucad | Ngom M.,Laboratoire Mixte International Adaptation des Plantes et Microorganismes associes aux Stress Environnementaux LAPSE | Diagne N.,Laboratoire Mixte International Adaptation des Plantes et Microorganismes associes aux Stress Environnementaux LAPSE | And 7 more authors.

Frankia is a soil actinomycete that forms nitrogen-fixing root nodule symbioses with eight angiosperms families including Casuarinaceae. Knowledge on symbiotic performance of several isolated strains with Casuarina species is limited. In this study, we characterized a collection of Frankia strains based on their growth kinetics and their symbiotic ability with Casuarina glauca specie. Results showed that Frankia strains Allo2, CcI3, CeD and Cg70.9 do not exhibit the same symbiotic ability both for their infectivity and effectiveness towards Casuarina glauca. All strains were able to infect and improve C. glauca plants growth. Frankia isolate CcI3 better improved plants height while CeD and Cg70.9 strains formed more nodules on inoculated plants roots. However, there is no correlation between the number of nodules formed and the effectiveness of strains. These preliminary results give ideas on which Frankia strains to use for obtaining an efficient symbiosis with C. glauca. However, others plant species and growth conditions should be tested for a longer period to better optimize the use of Frankia in reforestation programs. © 2015 Springer Science+Business Media Dordrecht Source

Soumare A.,Cheikh Anta Diop University | Soumare A.,Laboratoire Communications Of Microbiologie Lcm | Manga A.,University Gaston Berger | Fall S.,Institute Senegalais Of Recherches Agricoles | And 5 more authors.
Agroforestry Systems

This study aimed to test the effect of Eucalyptus litter on growth, roots symbioses status and nutrition of Sahelian acacia’s seedlings. Sangalkam sandy soil was amended with two levels (1 and 5 %) of Eucalyptus litter. As control of the effect of litter addition, sandy soil was amended with 1 and 5 % of maize litter. In addition, a control without amendment was established to highlight any changes caused by amendments. Eucalyptus litter impact on A. senegal, A. seyal and A. albida was determined by comparing plants grown in amended treatments to plants grown in both control treatments. Results indicated that Eucalyptus litter leads to changes in soil pH and phenol content. These changes negatively affect plant growth, their symbiotic status (mycorrhization, nodulation), and their nutrition (leaf chlorophyll content, total carbon, total nitrogen and phosphorus in shoots). Likewise, soil enzymatic activities were modified. Acid phosphatase was higher in Eucalyptus litter amended soil than in control while alkaline phosphatase was higher in control soil than in Eucalyptus litter amended soil. Positive correlations were recorded between roots symbioses and shoots mineral content suggesting that arbuscular mycorrhizal fungus and N-fixing symbiosis promote mineral uptake and storage in leaves. However, polyphenolic content of added litter was negatively linked to roots symbioses and growth of tested acacias. Results showed also, Eucalyptus litter impact on acacias growth was genotype and dose dependent. © 2014, Springer Science+Business Media Dordrecht. Source

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