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Journal of Bacteriology, August 2005, p. 5493-5495, Vol. 187, No. 15
0021-9193/05/$08.00+0     doi:10.1128/JB.187.15.5493-5495.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

De Novo Alanine Synthesis by Bacteroids of Mesorhizobium loti Is Not Required for Nitrogen Transfer in the Determinate Nodules of Lotus corniculatus

Shalini Kumar, Alexandre Bourdès, and Philip Poole*

Division of Microbiology, School of Animal and Microbial Sciences, University of Reading, Whiteknights, P.O. Box 228, Reading RG6 6AJ, United Kingdom

Received 24 November 2004/ Accepted 26 April 2005

Deletion of both alanine dehydrogenase genes (aldA) in Mesorhizobium loti resulted in the loss of AldA enzyme activity from cultured bacteria and bacteroids but had no effect on the symbiotic performance of Lotus corniculatus plants. Thus, neither indeterminate pea nodules nor determinate L. corniculatus nodules export alanine as the sole nitrogen secretion product.

* Corresponding author. Mailing address: School of Animal and Microbial Sciences, University of Reading, Whiteknights, P.O. Box 228, Reading RG6 6AJ, United Kingdom. Phone: (44) 118-378-8895. Fax: (44) 118-378-6671. E-mail: p.s.poole{at}reading.ac.uk.

Journal of Bacteriology, August 2005, p. 5493-5495, Vol. 187, No. 15
0021-9193/05/$08.00+0     doi:10.1128/JB.187.15.5493-5495.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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