2.50
Hdl Handle:
http://hdl.handle.net/10547/293977
Title:
Amino-acid cycling drives nitrogen fixation in the legume–Rhizobium symbiosis
Authors:
Lodwig, Emma M.; Hosie, Arthur H.F. ( 0000-0002-1327-7901 ) ; Bourdes, Alex; Findlay, K.; Allaway, D.; Karunakaran, R.; Downie, J. A.; Poole, Philip S.
Abstract:
The biological reduction of atmospheric N2 to ammonium (nitrogen fixation) provides about 65% of the biosphere's available nitrogen. Most of this ammonium is contributed by legume–rhizobia symbioses1, which are initiated by the infection of legume hosts by bacteria (rhizobia), resulting in formation of root nodules. Within the nodules, rhizobia are found as bacteroids, which perform the nitrogen fixation: to do this, they obtain sources of carbon and energy from the plant, in the form of dicarboxylic acids2, 3. It has been thought that, in return, bacteroids simply provide the plant with ammonium. But here the authors show that a more complex amino-acid cycle is essential for symbiotic nitrogen fixation by Rhizobium in pea nodules. The plant provides amino acids to the bacteroids, enabling them to shut down their ammonium assimilation. In return, bacteroids act like plant organelles to cycle amino acids back to the plant for asparagine synthesis. The mutual dependence of this exchange prevents the symbiosis being dominated by the plant, and provides a selective pressure for the evolution of mutualism.
Citation:
Lodwig, E.M., Hosie, A.H.F., Bourdes, A. (2003) 'Amino-acid cycling drives nitrogen fixation in the legume–Rhizobium symbiosis', Nature, 422, pp.722-726
Publisher:
Nature Publishing Group
Journal:
Nature
Issue Date:
2003
URI:
http://hdl.handle.net/10547/293977
DOI:
10.1038/nature01527
Additional Links:
http://www.nature.com/doifinder/10.1038/nature01527
Type:
Article
Language:
en
ISSN:
0028-0836
Appears in Collections:
Cell and Cryobiology Research Group

Full metadata record

DC FieldValue Language
dc.contributor.authorLodwig, Emma M.en_GB
dc.contributor.authorHosie, Arthur H.F.en_GB
dc.contributor.authorBourdes, Alexen_GB
dc.contributor.authorFindlay, K.en_GB
dc.contributor.authorAllaway, D.en_GB
dc.contributor.authorKarunakaran, R.en_GB
dc.contributor.authorDownie, J. A.en_GB
dc.contributor.authorPoole, Philip S.en_GB
dc.date.accessioned2013-06-14T12:50:06Z-
dc.date.available2013-06-14T12:50:06Z-
dc.date.issued2003-
dc.identifier.citationLodwig, E.M., Hosie, A.H.F., Bourdes, A. (2003) 'Amino-acid cycling drives nitrogen fixation in the legume–Rhizobium symbiosis', Nature, 422, pp.722-726en_GB
dc.identifier.issn0028-0836-
dc.identifier.doi10.1038/nature01527-
dc.identifier.urihttp://hdl.handle.net/10547/293977-
dc.description.abstractThe biological reduction of atmospheric N2 to ammonium (nitrogen fixation) provides about 65% of the biosphere's available nitrogen. Most of this ammonium is contributed by legume–rhizobia symbioses1, which are initiated by the infection of legume hosts by bacteria (rhizobia), resulting in formation of root nodules. Within the nodules, rhizobia are found as bacteroids, which perform the nitrogen fixation: to do this, they obtain sources of carbon and energy from the plant, in the form of dicarboxylic acids2, 3. It has been thought that, in return, bacteroids simply provide the plant with ammonium. But here the authors show that a more complex amino-acid cycle is essential for symbiotic nitrogen fixation by Rhizobium in pea nodules. The plant provides amino acids to the bacteroids, enabling them to shut down their ammonium assimilation. In return, bacteroids act like plant organelles to cycle amino acids back to the plant for asparagine synthesis. The mutual dependence of this exchange prevents the symbiosis being dominated by the plant, and provides a selective pressure for the evolution of mutualism.en_GB
dc.language.isoenen
dc.publisherNature Publishing Groupen_GB
dc.relation.urlhttp://www.nature.com/doifinder/10.1038/nature01527en_GB
dc.rightsArchived with thanks to Natureen_GB
dc.subjectamino-acid transporteren_GB
dc.subjectrhizobiumen_GB
dc.subjectplant nodulesen_GB
dc.titleAmino-acid cycling drives nitrogen fixation in the legume–Rhizobium symbiosisen
dc.typeArticleen
dc.identifier.journalNatureen_GB
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