Anuar Nurul Syahirah Shamsol, Kassim Aeyshah Abang, Utsumi Motoo, Iwamoto Koji, Goto Masafumi, Shimizu Kazuya, Othman Nor'azizi, Zakaria Zuriati, Sugiura Norio, Hara Hirofumi
Department of Environmental Engineering and Green Technology, Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia (UTM).
Graduate School of Life and Environmental Science, University of Tsukuba.
Microbes Environ. 2017 Dec 27;32(4):352-357. doi: 10.1264/jsme2.ME17109. Epub 2017 Oct 31.
Geosmin and 2-methylisoborneol (MIB) outbreaks in tropical water bodies, such as Southeast Asia, by actinomycetes have not yet been elucidated in detail. Six Streptomyces isolates from lowland environments in Malaysia were selected and evaluated for their odor production under different temperatures. The gene responsible for the production of geosmin, geoA, was detected in all isolates, while only two isolates harbored tpc, which is responsible for 2-MIB production. This result suggested that geosmin and 2-MIB synthesis pathway genes already existed in the environment in the Tropics of Southeast Asia. Furthermore, our isolates produced musty odor compounds at 30°C, and differences were observed in musty odor production between various temperatures. This result indicated the potential for odor episodes in water bodies of the tropical countries of Southeast Asia throughout the year due to the mean annual ambient temperature of 27°C in the lowlands.
放线菌在热带水体（如东南亚）中引发的土臭素和2-甲基异莰醇（MIB）暴发尚未得到详细阐明。从马来西亚低地环境中挑选出六株链霉菌分离株，并对它们在不同温度下产生气味的情况进行了评估。在所有分离株中均检测到负责土臭素产生的基因geoA，而只有两株分离株含有负责2-MIB产生的tpc基因。这一结果表明，东南亚热带地区的环境中已经存在土臭素和2-MIB合成途径基因。此外，我们的分离株在30°C时产生了霉味化合物，并且在不同温度下观察到霉味产生存在差异。这一结果表明，由于低地地区年平均环境温度为27°C，东南亚热带国家的水体全年都有产生气味事件的可能性。
