Crecimiento y supervivencia de Azospirillum en raíces y rizosfera de maíz con diferentes niveles de acidez / [Growth and survival of Azospirillum in roots and maize rhizospheres with different levels of acidity]
Rev. argent. microbiol
; 27(2): 99-105, abr.-jun. 1995.
Article
in Spanish
|
LILACS-Express
| LILACS, BINACIS
| ID: biblio-1171644
Responsible library:
AR32.1
Localization: [{"text": "AR32.1"}]
ABSTRACT
An experiment was carried out in order to evaluate the effect of pH on Azospirillum sp. growth and survival in maize rhizosphere. Sterilized maize seeds were sown in a perlite substratum with addition of a nutritive medium. The pots were buffered at two different pHs 5.8 (group one) and 7.0 (group two). Each group was divided in two treatments inoculated with Azospirillum sp. Az-39 and non-inoculated. Experimental pots were incubated at 20 degrees C with a 14 hour photoperiod. Growth of non-inoculated roots was negligible. Inoculated roots showed a better response at pH 5.8 than at 7.0. Several accompanying bacteria were found. Azospirillum grew in both groups with a low penetration into roots. A set of nutritive relationships among microorganisms and maize roots was observed; Xanthomonas is a maize pathogenic bacteria, and it is a NO3- consumer, and uses this anion as hydrogen acceptor. The Gram (-) Diplococcus is a nitrate producer . Cytophaga and Flavobacterium are related with roots decomposition. It is concluded that Azospirillum improves the root growth, mainly at pH 5.8.
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Collection:
International databases
/
National databases
/
Argentina
Database:
BINACIS
/
LILACS
Language:
Spanish
Journal:
Rev. argent. microbiol
Journal subject:
Microbiology
Year:
1995
Document type:
Article