Variation in the biological n<sub>2</sub>fixation by tree legumes in three ecological zones from the north to the south of Senegal

Ndiaye, Mamadou; Ganry, Francis

doi:10.1080/15324989709381476

Cited by 21 publications

(11 citation statements)

References 15 publications

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“…The d 15 N values of the non-legumes were basically in the same range as other non-N 2 fixing trees in Brazil (Yoneyama et al 1993). For most species isotope data correlated well with nodulation, which has been reported before (Ndiaye and Ganry 1997). In contrast, the nodulated legumes P. amazonum and N. oleracea had high d 15 N values not significantly different from non-nodulated species.…”

Section: Discussionsupporting

confidence: 55%

Estimation of symbiotic N2 fixation in an Amazon floodplain forest

Kreibich

Kern

Camargo³

et al. 2005

Oecologia

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Sustainable management for existing Amazonian forests requires an extensive knowledge about the limits of ecosystem nutrient cycles. Therefore, symbiotic nitrogen (N2) fixation of legumes was investigated in a periodically flooded forest of the central Amazon floodplain (Várzea) over two hydrological cycles (20 months) using the 15N natural abundance method. No seasonal variation in 15N abundance (delta 15N values) in trees which would suggest differences in N2 fixation rates between the terrestrial and the aquatic phase was found. Estimations of the percentage of N derived from atmosphere (%Ndfa) for the nodulated legumes with Neptunia oleracea on the one side and Teramnus volubilis on the other resulted in mean %Ndfa values between 9 and 66%, respectively. More than half of the nodulated legume species had %Ndfa values above 45%. These relatively high N gains are important for the nodulated legumes during the whole hydrological cycle. With a %Ndfa of 4-5% for the entire Várzea forest, N2 fixation is important for the ecosystem and therefore, has to be taken into consideration for new sustainable land-use strategies in this area.

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Section: Discussionsupporting

confidence: 55%

Estimation of symbiotic N2 fixation in an Amazon floodplain forest

Kreibich

Kern

Camargo³

et al. 2005

Oecologia

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“…From a symbiotic point of view, G. sepium has been described as being a species having a specificity for symbiosis with fast-growing rhizobia (Halliday & Somasegaran 1984;Sanginga et al 1991;Moreira et al 1993;De Lajudie et al 1994). However, Awonaike et al (1992) and Ndiaye & Ganry (1997) showed that G. sepium could also be nodulated by slowgrowing rhizobia. Thus, there is as to the type of rhizobia capable of nodulating G. sepium.…”

Section: Introductionmentioning

confidence: 95%

Diversity and effectiveness of rhizobial strains from Gliricidia sepium native to Reunion Island, Kenya and New Caledonia

Thiao

Neyra

Isidore³

et al. 2004

World J Microbiol Biotechnol

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The aim of this study was to use several approaches to assess the diversity occuring in a collection of rhizobial strains that had been isolated from Gliricidia sepium (Jacq.) Walp. originating from Kenya, Reunion Island and New Caledonia. Results showed that G. sepium establishes an effective symbiosis only with fast-growing rhizobia. This suggests that this legume nodulates preferentially with this type of rhizobia, although ineffective nodules were observed on root systems of plants inoculated with slow-growing rhizobia. It was possible to distinguish several groups of strains which have the same behaviour in terms of utilization of amino acids and sources of carbon and intrinsic resistance to antibiotics and salinity. Six molecular groups were distinguished by profiles obtained using PCR/RFLP techniques. No relationship was demonstrated between phenotypic groups and molecular groups. Neither was it possible to find a relationship between the geographic origins of the strains and their distribution in the several phenotypic and/or molecular groups. In an experiment carried out under glasshouse conditions, we observed that all strains from the collection significantly improved the growth of G. sepium cultivated in a substrate totally devoid of nitrogen. The strain GsK5 induced the greatest stimulation of plant growth.

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“…Tropical dry forests are usually rich in legume species and grow in soils with low organic N; therefore, the contribution of biological fixation to these species could be high (Shearer et al, 1983;Ndiaye and Ganry, 1997;Raddad et al, 2005). However, not all legume species are capable of fixation and, among the fixing ones, the proportion of fixed N varies greatly (Allen and Allen, 1981;Faria et al, 1984Faria et al, , 1987Faria et al, , 1994Faria and Lima, 1998;Boddey et al, 2000).…”

Section: Introductionmentioning

confidence: 96%

Biological nitrogen fixation in tree legumes of the Brazilian semi-arid caatinga

Freitas

Sampaio

Santos

et al. 2010

Journal of Arid Environments

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Variation in the biological n₂fixation by tree legumes in three ecological zones from the north to the south of Senegal

Cited by 21 publications

References 15 publications

Estimation of symbiotic N2 fixation in an Amazon floodplain forest

Estimation of symbiotic N2 fixation in an Amazon floodplain forest

Diversity and effectiveness of rhizobial strains from Gliricidia sepium native to Reunion Island, Kenya and New Caledonia

Biological nitrogen fixation in tree legumes of the Brazilian semi-arid caatinga

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Variation in the biological n2fixation by tree legumes in three ecological zones from the north to the south of Senegal

Cited by 21 publications

References 15 publications

Estimation of symbiotic N2 fixation in an Amazon floodplain forest

Estimation of symbiotic N2 fixation in an Amazon floodplain forest

Diversity and effectiveness of rhizobial strains from Gliricidia sepium native to Reunion Island, Kenya and New Caledonia

Biological nitrogen fixation in tree legumes of the Brazilian semi-arid caatinga

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Variation in the biological n₂fixation by tree legumes in three ecological zones from the north to the south of Senegal