Plant growth promoting rhizobacteria isolated of sugarcane under organic or conventional fertilization. / Rizobactérias promotoras de crescimento vegetal isoladas de cana-de-açúcar sob fertilização orgânica e/ou convencional.

AUTOR(ES)

Zilda Machado de Oliveira

DATA DE PUBLICAÇÃO

2009

RESUMO

We evaluated the fertilization effect (organic and conventional) on the sugarcane rhizobacteria physiology. We isolated and identified bacteria of five genera (Beijerinckia, Burkholderia, Enterobacter, Klebsiella and Pseudomonas) prevalent in sugarcane crops. The parameters investigated were: acetylene reduction, IAA and ethylene production, phosphate solubilization, amino acid release, and antifungal activity. Burkholderia strains showed the better results in phosphate solubilization and antifungal activity. The Pseudomonas were prominent in the production of ethylene and Beijerinckia strains showed a greater N2 fixation capacity. The strains from Enterobacter, Klebsiella and Pseudomonas were the better IAA producers. In vitro, our results showed that bacteria isolated from plants submitted to organic treatment with an excess of phosphate, did not show potential for inorganic phosphate solubilization.

ASSUNTO(S)

aia rhizobacteria phosphate nitrogenase cana-de-açúcar rizobactéria crescimento vegetal sugarcane iaa fosfatos nitrogenase plant growth

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