Effect of Nitrate on Symbiotic Nitrogen Fixation in Acacia albida Del. (Syn. Faidherbia albida)

Diouf, Diégane; Laffont, J.; Chevallier, H.; Nef-Campa, Claudine

doi:10.1007/978-94-011-5159-7_165

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“…This strategy might allow more efficient assimilation of N when availability of NO $ − is limited. In addition, the high NO $ − content in roots of F. albida is correlated to an inhibition of nodulation (Diouf et al, 1998), thus explaining the low capacity of the species for fixation of atmospheric N # . Then, as already suggested (Dommergues, 1995), the soil improvement observed under the canopy of F. albida (Vandenbeldt, 1992) might be linked more to its ability to restore soil fertility through its litter composition than to its capacity for N # fixation.…”

Section: mentioning

confidence: 99%

Differences in nitrogen metabolism of Faidherbia albida and other N₂‐fixing tropical woody acacias reflect habitat water availability

Campa¹,

Diouf²,

Ndoye³

et al. 2000

New Phytologist

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The activities of nitrate reductase and glutamine synthetase were evaluated in young plants of Faidherbia albida, a tropical woody legume, fed with different N sources under hydroponic conditions. Results showed that assimilation of both NO3− and NH4+ preferentially took place in shoots. A basal amount of nitrate reductase activity was detected in shoots of plants grown with an NO3−‐free solution or placed under N2‐fixing conditions, and also in nodules of N2‐fixing plants. This strongly suggests that constitutive nitrate reductase activity is present in these organs. Analyses of the soluble nitrogenous content showed that the major form of N in the different organs was α‐amino acids (particularly amides), irrespective of the N status of the culture conditions. The same result was obtained for nodulated plants grown in local sandy soil. In this case, amide‐N generally accounted for more than 40% of the total soluble N. This was especially true in nodules. Ureide‐N never exceeded 9% of the total soluble N and did not appear to increase with increasing nodule nitrogenase activity. Amides were also predominant in three N2‐fixing Sahelian acacias (Acacia seyal, A. nilotica and A. tortilis), showing that F. albida does not differ from Sahelian Acacia in terms of the metabolism of fixed N. However, like another Sahelian acacia growing preferentially near water (A. nilotica), F. albida can be distinguished from acacias growing strictly in arid zones (A. seyal and A. tortilis) in terms of initial growth, water and nitrate management.

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Section: mentioning

confidence: 99%

Differences in nitrogen metabolism of Faidherbia albida and other N₂‐fixing tropical woody acacias reflect habitat water availability

Campa¹,

Diouf²,

Ndoye³

et al. 2000

New Phytologist

View full text Add to dashboard Cite

show abstract

Effect of Nitrate on Symbiotic Nitrogen Fixation in Acacia albida Del. (Syn. Faidherbia albida)

Cited by 1 publication

References 4 publications

Differences in nitrogen metabolism of Faidherbia albida and other N₂‐fixing tropical woody acacias reflect habitat water availability

Differences in nitrogen metabolism of Faidherbia albida and other N₂‐fixing tropical woody acacias reflect habitat water availability

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Effect of Nitrate on Symbiotic Nitrogen Fixation in Acacia albida Del. (Syn. Faidherbia albida)

Cited by 1 publication

References 4 publications

Differences in nitrogen metabolism of Faidherbia albida and other N2‐fixing tropical woody acacias reflect habitat water availability

Differences in nitrogen metabolism of Faidherbia albida and other N2‐fixing tropical woody acacias reflect habitat water availability

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Differences in nitrogen metabolism of Faidherbia albida and other N₂‐fixing tropical woody acacias reflect habitat water availability

Differences in nitrogen metabolism of Faidherbia albida and other N₂‐fixing tropical woody acacias reflect habitat water availability