Effect of Manganese and Zinc Ions on the Growth of Rhizobium
AUTOR(ES)
Wilson, D. O.
RESUMO
Five strains, representing four species of Rhizobium, were grown in specially purified synthetic culture solutions with manganese or zinc ion concentrations ranging from 0 to 10−5m. Omission of Mn2+ restricted growth to 0.4 to 10% of that of controls, depending on the species. Growth was generally maximum with 10−6m Mn2+ and nearly so with 10−5m. Omission of Zn2+ restricted growth to 1 to 20% of that of controls. Growth was generally maximum with 10−7m Zn2+. The 10−5m level of Zn2+ was toxic to a variable degree to all species, suppressing the growth of one strain of R. meliloti to 49% of that of controls, and of R. phaseoli to only 0.4% of that of controls. A Mn2+ × Zn2+ interaction was also obtained as evidenced by a higher apparent Zn2+ requirement with 10−7m Mn2+ than with 10−6m Mn2+.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=247619Documentos Relacionados
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