Effectes of high temperature on survival, symbiotic performance and genomic modifications of bean nodulating Rhizobium strains
Rev. microbiol
; 29(4): 295-300, out.-dez. 1998. ilus, tab
Article
in En
| LILACS
| ID: lil-251740
Responsible library:
BR32.1
RESUMO
High temperatures can affect the survival, establishment and symbiotic properties of "Rhizobium" strains. Bean nodulating "Rhizobium" strains are considered particularly sensitive because on this strains genetic recombinations and/or deletions occur frequently, thus compromising the use of these bacteria as inoculants. In this study "R. tropici" and "R. leguminosarum" bv. "phaseoli" strains isolated from Cerrado soils were exposed to thermal stress and the strains' growth, survival and symbiotic relationships as well as alterations in their genotypic and phenotypic were analysed. After successive thermal shocks at 45ºC for four hours, survival capacity appeared to be strain-specifc, independent of thermo-tolerance and was more apparent in "R. tropici" strains (with the exception of FJ2.21) were more stable than "R. leguminosarum" bv. "phaseoli" strains because no significant phenotypic alterations were observed following thermal treatments and they maintained their original genotypic pattern after innoculation in plants.
Full text:
1
Index:
LILACS
Main subject:
Rhizobium
/
Symbiosis
/
Temperature
/
Genome, Plant
/
Fabaceae
Language:
En
Journal:
Rev. microbiol
Journal subject:
MICROBIOLOGIA
Year:
1998
Type:
Article