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Strain-specific salt tolerance and osmoregulatory mechanisms in Azospirillum brasilense.
Chowdhury, Soumitra Paul; Nagarajan, Thirunavukkarasu; Tripathi, Rachna; Mishra, Mukti Nath; Le Rudulier, Daniel; Tripathi, Anil Kumar.
Afiliación
  • Chowdhury SP; School of Biotechnology, Banaras Hindu University, Varanasi, India.
FEMS Microbiol Lett ; 267(1): 72-9, 2007 Feb.
Article en En | MEDLINE | ID: mdl-17156127
Salinity stress inhibits the growth and nitrogen fixation ability of the plant growth-promoting rhizobacterium Azospirillum brasilense. Five strains of A. brasilense were isolated from the rhizosphere of Indian cereals and grasses and identified on the basis of their phenotypic features and 16S rRNA gene sequence. The five Indian isolates and two standard strains of A. brasilense, Sp7 and Cd, showed notable differences in growth, acetylene-reducing activity under salt stress, and ability to take up and use glycine betaine for the restoration of growth and acetylene-reducing activity under salt stress. Salt stress also enhanced the production of exopolysaccharides and cell aggregates, the extent of which varied in different strains of A. brasilense at different carbon to nitrogen ratios in the culture medium. It can be concluded that the production of exopolysaccharides and cell aggregates is a more consistent physiological response of A. brasilense to salt stress than is the uptake and osmoprotection by glycine betaine.
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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Adaptación Fisiológica / Cloruro de Sodio / Azospirillum brasilense / Antibacterianos Tipo de estudio: Prognostic_studies País/Región como asunto: America do sul / Asia / Brasil Idioma: En Revista: FEMS Microbiol Lett Año: 2007 Tipo del documento: Article País de afiliación: India Pais de publicación: Reino Unido
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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Adaptación Fisiológica / Cloruro de Sodio / Azospirillum brasilense / Antibacterianos Tipo de estudio: Prognostic_studies País/Región como asunto: America do sul / Asia / Brasil Idioma: En Revista: FEMS Microbiol Lett Año: 2007 Tipo del documento: Article País de afiliación: India Pais de publicación: Reino Unido