DEVELOPMENT OF NOVEL WATER QUALITY CONSERVATION SYSTEM BY USING SYMBIOSIS BETWEEN AQUATIC PLANTS AND RHIZOBACTERIA

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The basic investigations on symbiosis between aquatic plants and rhizobacteria were performedto evaluate the possibility of the low-carbon and environmentally-friendly water quality conservation system againstaromatic compounds contamination. The root exudate of Spirodela polyrrhiza, a duckweed, was revealed to be composed of several phenolic components, and the trace components of the root exudate were varied depending on the chemicals to which S. polyrrhiza was exposed. The accelerated degradation of various aromatic compounds were confirmed in the rhizosphere of Phragmites australis, a reed, as well as S. polyrrhiza. In addition, 4-tert-butylphenol(4-t-BP) degrading bacteria were isolated from their rhizosphere for the first time, and their 4-t-BP degradation pathway and mechanism of accelerated 4-t-BP degradation could be clarified.