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KMID : 0545120030130060955
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Journal of Microbiology and Biotechnology
2003 Volume.13 No. 6 p.955 ~ p.959
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PQQ-Dependent Organic Acid Production and Effect on Common Bean Growth by Rhizobium tropici CIAT 899
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CHO, YOUNG-SHIN
PARK, RO-DONG/KIM, YONG-WOONG/HWANGBO, HOON/JUNG, WOO-JIN/SHU, JANG-SUN/KOO, BON-SUNG
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Abstract
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Rhizobium tropici CIAT 899 is capable of synthesizing inactive apo-glucose dehydrogenase (GDH). To become an active holo enzyme. the GDH requires a cofactor, PQQ. When R. tropici CIAT 899 was grown in a broth culture medium containing hydroxyapatite and pyrrolo quinoline quinone (PQQ), pH decreased while the concentration of soluble P increased. The solubilization of hydroxyapatite was associated with the production of gluconic acid and 2-ketogluconic acids. The organic acid production and P solubilization were greatly enhanced when the bacterium was grown with air supply. Effect of R. tropici CIAT 899 with (CI+PQQ) and without PQQ (CI) on the common bean growth was examined. Shoot and root weight. and N and P contents in CI+PQQ treatment, were significantly higher than those in control and CI treatment. Nodule weight and acetylene reducing activities were also significantly higher in CI+PQQ treatment than in other treatments.
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