Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Isolation, selection and characterization of root-associated growth promoting bacteria in Brazil Pine (Araucaria angustifolia)

Full text
Author(s):
Ribeiro, Carlos Marcelo [1] ; Bran Nogueira Cardoso, Elke Jurandy [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Soil Microbiol Lab, Dept Soil Sci, Luiz de Queiroz Coll Agr, ESALQ USP, BR-13418900 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: MICROBIOLOGICAL RESEARCH; v. 167, n. 2, p. 69-78, 2012.
Web of Science Citations: 50
Abstract

Araucaria angustifolia, a unique species of this genus that occurs naturally in Brazil, has a high socio-economic and environmental value and is critically endangered of extinction, since it has been submitted to intense predatory exploitation during the last century. Root-associated bacteria from A. angustifolia were isolated, selected and characterized for their biotechnological potential of growth promotion and biocontrol of plant pathogenic fungi. Ninety-seven strains were isolated and subjected to chemical tests. All isolates presented at least one positive feature, characterizing them as potential PGPR. Eighteen isolates produced indole-3-acetic acid (IAA), 27 were able to solubilize inorganic phosphate, 21 isolates were presumable diazotrophs, with pellicle formation in nitrogen-free culture medium, 83 were phosphatases producers, 37 were positive for siderophores and 45 endospore-forming isolates were antagonistic to Fusarium oxysporum, a pathogen of conifers. We also observed the presence of bacterial strains with multiple beneficial mechanisms of action. Analyzing the fatty acid methyl ester (FAME) and partial sequencing of the 16S rRNA gene of these isolates, it was possible to characterize the most effective isolates as belonging to Bacillaceae (9 isolates), Enterobacteriaceae (11) and Pseudomonadaceae (1). As far as we know, this is the first study to include the species Ewingella americana as a PGPR. (C) 2011 Elsevier GmbH. All rights reserved. (AU)

FAPESP's process: 01/05146-6 - Plant biodiversity and soil organisms associated to natural and disturbed Araucaria angustifolia ecosystems of the State of São Paulo
Grantee:Elke Jurandy Bran Nogueira Cardoso
Support Opportunities: BIOTA-FAPESP Program - Thematic Grants