Biosynthesis of compatible solutes in rhizobial strains isolated from Phaseolus vulgaris nodules in Tunisian fields.

BMC Microbiology
Cristina Fernandez-AuniónCarmen Vargas

Abstract

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. The most NaCl-tolerant strain was A. tumefaciens 10c2, followed (in decreasing order) by R. tropici CIAT 899, R. leguminosarum bv. phaseoli 31c3, R. etli 12a3 and R. gallicum bv. phaseoli 8a3. 13C- and 1H-NMR analyses showed that all Rhizobium strains synthesized trehalose whereas A. tumefaciens 10c2 synthesized mannosucrose. Glut...Continue Reading

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Citations

May 17, 2011·BMC Microbiology·Catherine FontenelleAnnie Trautwetter
Sep 19, 2012·BMC Microbiology·Mercedes Reina-BuenoCarmen Vargas
Nov 6, 2012·The New Phytologist·Aarón BarrazaFederico Sanchez
Jan 11, 2017·Scientific Reports·Eoin GunnigleDon A Cowan
Apr 18, 2018·BioMed Research International·Uliana Ya StambulskaVolodymyr I Lushchak
Aug 10, 2017·International Journal of Molecular Sciences·Rongshu DongGuodao Liu
Nov 30, 2019·Proceedings of the National Academy of Sciences of the United States of America·Augustine T ZvinavasheBenedetto Marelli

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Methods Mentioned

BETA
nuclear magnetic resonance
NMR
PCR
phosphotransferase

Software Mentioned

ChromasPro
BLAST
Clustal W
MEGA

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