Biosynthesis of compatible solutes in rhizobial strains isolated from <Emphasis Type="Italic">Phaseolus vulgaris</Emphasis> nodules in Tunisian fields |
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| Authors: | Cristina Fernandez-Aunión Thouraya Ben Hamouda Fernando Iglesias-Guerra Montserrat Argandoña Mercedes Reina-Bueno Joaquín J Nieto M Elarbi Aouani Carmen Vargas |
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| Institution: | (1) Department of Microbiology and Parasitology, University of Seville, Seville, Spain;(2) Laboratory of Legumes. Centre of Biotechnology of Borj Cedria, BP 901, 2050 Hammam-lif, Tunisia;(3) Department of Organic and Pharmaceutical Chemistry, University of Seville, Seville, Spain;(4) NEPAD/North Africa Biosciences Network. National Research Center, El Buhouth St, 12311 Dokki, Cairo, Egypt |
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| Abstract: | Background Associated with appropriate crop and soil management, inoculation of legumes with microbial biofertilizers can improve food
legume yield and soil fertility and reduce pollution by inorganic fertilizers. Rhizospheric bacteria are subjected to osmotic
stress imposed by drought and/or NaCl, two abiotic constraints frequently found in semi-arid lands. Osmostress response in
bacteria involves the accumulation of small organic compounds called compatible solutes. Whereas most studies on rhizobial
osmoadaptation have focussed on the model species Sinorhizobium meliloti, little is known on the osmoadaptive mechanisms used by native rhizobia, which are good sources of inoculants. In this work,
we investigated the synthesis and accumulations of compatible solutes by four rhizobial strains isolated from root nodules
of Phaseolus vulgaris in Tunisia, as well as by the reference strain Rhizobium tropici CIAT 899T. |
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