Characterization of free nitrogen fixing bacteria of the genus Azotobacter in organic vegetable-grown Colombian soils
Braz. j. microbiol
;
42(3): 846-858, July-Sept. 2011. ilus, tab
Article
Dans Anglais
| LILACS
| ID: lil-607513
ABSTRACT
With the purpose of isolating and characterizing free nitrogen fixing bacteria (FNFB) of the genus Azotobacter, soil samples were collected randomly from different vegetable organic cultures with neutral pH in different zones of Boyacá-Colombia. Isolations were done in selective free nitrogen Ashby-Sucrose agar obtaining a recovery of 40 percent. Twenty four isolates were evaluated for colony and cellular morphology, pigment production and metabolic activities. Molecular characterization was carried out using amplified ribosomal DNA restriction analysis (ARDRA). After digestion of 16S rDNA Y1-Y3 PCR products (1487pb) with AluI, HpaII and RsaI endonucleases, a polymorphism of 16 percent was obtained. Cluster analysis showed three main groups based on DNA fingerprints. Comparison between ribotypes generated by isolates and in silico restriction of 16S rDNA partial sequences with same restriction enzymes was done with Gen Workbench v.2.2.4 software. Nevertheless, Y1-Y2 PCR products were analysed using BLASTn. Isolate C5T from tomato (Lycopersicon esculentum) grown soils presented the same in silico restriction patterns with A. chroococcum (AY353708) and 99 percent of similarity with the same sequence. Isolate C5CO from cauliflower (Brassica oleracea var. botrytis) grown soils showed black pigmentation in Ashby-Benzoate agar and high similarity (91 percent) with A. nigricans (AB175651) sequence. In this work we demonstrated the utility of molecular techniques and bioinformatics tools as a support to conventional techniques in characterization of the genus Azotobacter from vegetable-grown soils.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Ribosomes
/
Microbiologie du sol
/
Techniques in vitro
/
ADN ribosomique
/
Séquence nucléotidique
/
Réaction de polymérisation en chaîne
/
Agar-agar
/
Génétique microbienne
/
Fixation de l'azote
Pays comme sujet:
Amérique du Sud
/
Colombie
langue:
Anglais
Texte intégral:
Braz. j. microbiol
Thème du journal:
Microbiologie
Année:
2011
Type:
Article
Pays d'affiliation:
Colombie
/
Allemagne
Institution/Pays d'affiliation:
Pontificia Universidad Javeriana/CO
/
University of Bonn/DE
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