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Bragantia

Print version ISSN 0006-8705On-line version ISSN 1678-4499

Bragantia vol.47 no.2 Campinas  1988

http://dx.doi.org/10.1590/S0006-87051988000200017 

VII. MICROBIOLOGIA DO SOLO
NOTA

 

Tolerância de Bradyrhizobium sp. de mimosoideae à acidez em meio de cultura

 

Tolerance of mimosoideae Bradyrhizobium sp. strains to acidity in culture media

 

 

Walter Quadros Ribeiro JúniorI, *; Avílio Antonio FrancoII; Eli Sidney LopesIII, *

IPesquisador da EMGOPA, Rua 58, n9 94, Centro, 74000 Goiás
IIPesquisador da EMBRAPA, UAPNPBS, km 47, 23851 Seropédica, RJ
IIISeção de Microbiologia do Solo, Instituto Agronômico (IAC), Caixa Postal 28, 13001 Campinas (SP)

 

 


RESUMO

Foram realizados testes em meio de cultivo acidificado para avaliar a tolerância de 59 estirpes de Bradyrhizobium sp. isolados de Mimosoideae. As culturas, por via de regra, apresentaram crescimento rápido e alcalinização do meio. Das estirpes testadas, dez apresentaram crescimento em meio com valor de pH 4,6 (três, crescimento rápido; um, médio e seis, lento). Destas, oito não induziram alteração visual na cor do indicador bromotimol-azul incluído no meio. A estirpe SMS-513, uma entre essas oito, promoveu acidificação no meio com valor de pH 6,2, sendo considerada tolerante à acidez. Algumas estirpes cresceram em meio de cultura acidificado, somente com alta concentração inicial de células.

Termos de indexação: rizóbios tolerantes à acidez; Mimosoideae; Bradyrhizobium sp.


SUMMARY

Fifty-nine Bradyrhizobium sp. strains isolated from Mimosoideae subfamily of Leguminosae were tested on acidified agar medium. Most strains were found to be fast growing and alcalinized the medium. Ten strains grew on pH 4.6; out of them, three were fast growing, six were slow growing and one was intermediate. Eight of the tested strains did not induce visual changes in the bromothymol-blue indicator. The strain SMS-513 acidified the medium with pH 6.2, and was considered acid tolerant.

Index terms: acid tolerant rhizobia, Mimosoideae, Bradyrhizobium sp.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

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Trabalho recebido para publicação em 7 de outubro de 1986 e aceito em 6 de setembro de 1988.

 

 

* Com bolsa de pesquisa do CNPq.

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