Phenotypic diversity and amylolytic activity of fast growing rhizobia from pigeonpea [Cajanus cajan (L.) Millsp]

This study evaluated 26 pigeonpea rhizobial isolates according to their cultural characteristics, intrinsic antibiotic resistance, salt and temperature tolerance, carbon source utilization and amylolytic activity. The cultural characterization showed that the majority of them presented the ability t...

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Bibliographic Details
Published in:Brazilian journal of microbiology 2012-10, Vol.43 (4), p.1604-1612
Main Authors: Júnior, Paulo Ivan Fernandes, de Lima, Andréa Aparecida, Passos, Samuel Ribeiro, Tuão Gava, Carlos Alberto, de Oliveira, Paulo Jansen, Rumjanek, Norma Gouvêa, Xavier, Gustavo Ribeiro
Format: Article
Language:eng ; por
Subjects:
Bacteria
Bacteriology
Enzymes
Genotype & phenotype
Legumes
MICROBIOLOGY
Soil microorganisms
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Summary:This study evaluated 26 pigeonpea rhizobial isolates according to their cultural characteristics, intrinsic antibiotic resistance, salt and temperature tolerance, carbon source utilization and amylolytic activity. The cultural characterization showed that the majority of them presented the ability to acidify the YMA. Among the 27 isolates evaluated, 25 were able to grow when incubated at 42° C and 11 showed tolerance to 3% (w/v) of NaCl in YMA medium. The patterns of carbon sources utilization was very diverse among the isolates. It was observed the capacity of three strains to metabolize all the carbon sources evaluated and a total of 42% of the bacterial isolates was able to grow in the culture medium supplemented with at least, six carbon sources. The carbon sources mannitol (control) and sucrose were metabilized by all isolates evaluated. The profile of intrinsic resistance to antibiotics showed that the isolates were mostly resistant to streptomycin and ampicillin, but susceptible to kanamycin and chloranphenicol. High amylolytic activity of, at least, four isolates was also demonstrated, especially for isolated 47.3b, which showed the highest enzymatic index. These results indicate the metabolic versatility of the pigeonpea rhizobia, and indicates the isolate 47.3b to further studies regarding the amylase production and characterization.
ISSN:1517-8382
1678-4405
1678-4405
DOI:10.1590/S1517-83822012000400045