Genetic Analysis of 2-Methylisoborneol-Producing Cyanobacterium Sampled from the Upper Reaches of the Tama River

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  • TSUNODA Tokuko
    Water Quality Management Center, Bureau of Waterworks, Tokyo Metropolitan Government Present affiliation: Tokyo Metropolitan Institute of Public Health
  • NAKAHIGASHI Hirokazu
    Water Quality Management Center, Bureau of Waterworks, Tokyo Metropolitan Government Present affiliation: Ozaku Purification Plant, Bureau of Waterworks, Tokyo Metropolitan Government
  • KANAMI Taku
    Water Quality Management Center, Bureau of Waterworks, Tokyo Metropolitan Government
  • OIKAWA Tomo
    Water Quality Management Center, Bureau of Waterworks, Tokyo Metropolitan Government

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  • 多摩川上流に発生したかび臭産生藍藻の遺伝子解析結果
  • タマガワ ジョウリュウ ニ ハッセイ シタ カビ シュウ サンセイ アイ ソウ ノ イデンシ カイセキ ケッカ

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Abstract

Since 2009, 2-methylisoborneol: MIB, a kind of musty-odor substance, have been detected in the upper reaches of the Tama River with the MIB concentration reaching 87 ng·L-1 in 2011. An MIB-producing cyanobacterium was considered by microscopic observation to belong to the genus Phormidium(we use conventional botanical name in this report. The same applies hereafter.), which propagates on the surface of riverbed stones. However, it was difficult to identify it at the species level morphologically. Therefore, we tried to determine its species by genetic analysis. We performed PCR amplification of the region of the cyanobacterial16S rRNA gene and ITS(base length: approximately 2000 base pairs). From the result, the MIB-producing cyanobacterium was estimated as Phormidium autumnale. It was concluded that this MIB-producing Phormidium sp. has existed in the Tama River since at least 2005.

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