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Applied and Environmental Microbiology, November 2005, p. 7603-7606, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7603-7606.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Rhizobium leguminosarum Biovar viciae Symbiotic Hydrogenase Activity and Processing Are Limited by the Level of Nickel in Agricultural Soils

Ana-Claudia Ureta,1 Juan Imperial,1,2 Tomás Ruiz-Argüeso,1 and Jose M. Palacios1*

Department of Biotechnology, Universidad Politécnica de Madrid,1 C.S.I.C, Ciudad Universitaria s/n, 28040 Madrid, Spain2

Received 15 March 2005/ Accepted 16 June 2005

Analysis of levels of hydrogenase processing and activity in Rhizobium leguminosarum biovar viciae bacteroids from pea (Pisum sativum) plants showed that the oxidation of nitrogenase-evolved hydrogen is limited by the availability of nickel in agricultural soils. This limitation was overcome by using an inoculant strain engineered for higher hydrogenase expression.

* 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.

Applied and Environmental Microbiology, November 2005, p. 7603-7606, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7603-7606.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.





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