Characterization of plant-growth promoting diazotrophic bacteria isolated from field grown Chinese cabbage under different fertilization conditions.
J Microbiol
; 47(2): 147-55, 2009 Apr.
Article
em En
| MEDLINE
| ID: mdl-19412597
ABSTRACT
Diazotrophic bacteria isolated from the rhizosphere of Chinese cabbage were assessed for other plant growth promoting characteristics viz., production of IAA, ethylene, ACC deaminase, phosphate solubilization, and gnotobiotic root elongation. Their effect on inoculation to Chinese cabbage was also observed under growth chamber conditions. A total of 19 strains that showed higher nitrogenase activity identified by 16S rRNA gene sequence analysis were found to be the members of the genera Pseudomonas and Agrobacterium belonging to alpha- and gamma-Proteobacteria groups. These strains were also efficient in producing IAA and ACC deaminase though they produced low levels of ethylene and no phosphate solubilization. In addition, inoculation of selected diazotrophic bacterial strains significantly increased seedling length, dry weight, and total nitrogen when compared to uninoculated control. The colonization of crop plants by diazotrophic bacteria can be affected by many biotic and abiotic factors, and further studies are oriented towards investigating the factors that could influence the establishment of a selected bacterial community.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Reguladores de Crescimento de Plantas
/
Microbiologia do Solo
/
Bactérias
/
Brassica
/
Fixação de Nitrogênio
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
J Microbiol
Assunto da revista:
MICROBIOLOGIA
Ano de publicação:
2009
Tipo de documento:
Article