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

进行了水生植物与根际细菌共生的基础调查，以评价低碳、环保型水质保护系统抵御根际化合物污染的可能性。浮萍根分泌物中含有多种酚类成分，根分泌物中的微量成分因接触的化学物质不同而不同。芦苇和芦根根际对多种芳香族化合物的降解有加速作用。此外，首次从其根际分离到4-叔丁基苯酚(4-t-BP)降解菌，阐明了它们的降解途径和加速4-t-BP降解的机理。

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.