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Applied and Environmental Microbiology, November 2005, p. 7536-7538, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7536-7538.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Symbiotic Hydrogenase Activity in Bradyrhizobium sp. (Vigna) Increases Nitrogen Content in Vigna unguiculata Plants

Cecilia Baginsky,1,{dagger} Belén Brito,1 Juan Imperial,2 Tomás Ruiz-Argüeso,1 and Jose M. Palacios1*

Laboratorio de Microbiología, Departamento de Biotecnología, E.T.S. Ingenieros Agrónomos, Universidad Politécnica de Madrid, Madrid, Spain,1 Consejo Superior de Investigaciones Científicas, Ciudad Universitaria s/n, 28040 Madrid, Spain2

Received 9 May 2005/ Accepted 27 June 2005

Bradyrhizobium sp. (Lupinus) and Bradyrhizobium sp. (Vigna) mutants in which hydrogenase (hup) activity was affected were constructed and analyzed. Vigna unguiculata plants inoculated with the Bradyrhizobium sp. (Vigna) hup mutant showed reduced nitrogenase activity and also a significant decrease in nitrogen content, suggesting a relevant contribution of hydrogenase activity to plant yield.

* Corresponding author. Mailing address: Laboratory of Microbiology, Department of Biotechnology, E.T.S. Ingenieros Agrónomos, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain. Phone: 34-91-336.5759. Fax: 34-91-336.5757. E-mail: jose.palacios{at}upm.es.

{dagger} Present address: Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 1004, Santiago, Chile.

Applied and Environmental Microbiology, November 2005, p. 7536-7538, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7536-7538.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.





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