Influence oF Pseudomonas putida on nodulation of Phaseolus vulgaris

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Abstract

The effect of Pseudomonas putida (isolate M17) on Rhizobium phaseoli nodulation of the common bean, Phaseolus vulgaris, was investigated under field and greenhouse conditions. The results indicated that P. putida markedly increased nodulation compared to R. phaseoli controls. Furthermore, 2-ketogluconic acid, a phosphate-solubiliring compound, was detected in P. putida M17. This could imply an increased P supply to roots of P. vutgaris, which may function to increase nodules. Bean yields and shoot fresh weight were not significantly altered by the addition of P. putida M17.

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Present address: Department of Botany, North Carolina State University, Raleigh, NC 27650, U.S.A.

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