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Published online ahead of print on 17 September 2009 as doi:10.1099/mic.0.031807-0
Microbiology (2009), DOI 10.1099/mic.0.031807-0
© 2009 Society for General Microbiology
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Microbiology 0 (2009), mic.0.031807; DOI  10.1099/mic.0.031807-0
© 2009 Society for General Microbiology

The Azospirillum brasilense Sp7 noeJ and noeL genes are involved in extracellular polysaccharide biosynthesis

Anat Lerner1, Susana Castro-Sowinski2, Angel Valverde3, Hadas Lerner1, Rachel Dror1, Yaacov Okon1 and Saul Burdman1,4

1 Department of Plant Pathology and Microbiology, The Hebrew University of Jerusalem, Israel;
2 Universidad de la República, Uruguay;
3 Instituto de Recursos Naturales y Agrobiología de Salamanca, Spain

AAzospirillum brasilense is a plant root colonizing bacterium that exerts beneficial effects on growth of many agricultural crops. Extracellular polysaccharides of the bacterium play an important role in its interactions with plant roots. The pRhico plasmid of A. brasilense Sp7- also named p90- carries several genes involved in synthesis and export of cell surface polysaccharides. We generated two Sp7 mutants impaired in two pRhico-located genes, noeJ and noeL, encoding mannose-6-phosphate isomerase and GDP-mannose 4,6-dehydratase, respectively. Our results demonstrate that in A. brasilense Sp7, noeJ and noeL are involved in lipopolysaccharide and exopolysaccharide synthesis. noeJ and noeL mutant strains were significantly altered in their outer membrane and cytoplasmic/periplasmic protein profiles relative to the wild-type strain. Moreover, both noeJ and noeL mutations significantly affected the bacterial responses to several stresses and antimicrobial compounds. Disruption of noeL but not noeJ affected the ability of the A. brasilense Sp7 to form biofilms. The pleiotropic alterations observed in the mutants could be due, at least partially, to their altered lipopolysaccharides and exopolysaccharides relative to the wild type.

4 E-mail: saulb{at}agri.huji.ac.il






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