Pseudomonas cepacia—A Characteristic Rhizoplane microorganisms in rice plant

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Abstract
Rice rhizoplane microorganisms consist mostly of Bacillus sp. and Pseudomonas sp. Isolated Pseudomonas strains from rice rhizoplane specifically accumulated nitrite in a medium containing rice root extract and nitrate. On the other hand, all strains of isolated Bacillus were found to be almost inactive in accumulating nitrite. Therefore, Pseudomonas was estimated to be specifically responsible for the microbial effect on root growth, because the effect of nitrite on root growth was found in a previous investigation to be nearly the same as that obtained with the combined rhizoplane microorganisms. Isolated Pseudomonas strains were further studied taxonomically and all of them were identified as Pseudomonas cepacia.

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