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Abstract
The Yunnan geothermal area has many neutral and alkalescent thermal springs. Members of the genus Thermus have been found in thermal environments. In this study, we attempted to cultivate numerically abundant Thermus species using a variety of different strategies. A total of 223 strains of Thermus-like bacteria were isolated from seventeen hot spring samples of four geothermal regions (Baoshan, Dali, Lincang and Dehong). These strains were classified into two genera, Thermus and Meiothermus, based on 16S rDNA. The optimal isolation temperature of the Thermus genus was 63–70 °C. The highest Thermus diversity was found at 63 °C. Thermus brockianus was a universal culturable bacterium in the four geothermal regions. The principal component analysis (PCA) showed that T. oshimai preferred to inhabit the hot springs of the Baoshan (Bs) geothermal region, and T. amyloliquefaciens dominated the Dali (Dl) geothermal region, whereas T. tengchongensis accumulated in the Lincang (Lc) and Dehong (Dh) geothermal regions. The results suggested that Thermus species had habitat-preferable characteristics among the four geothermal regions. The findings may help identify the niche from which Thermus strains can likely be isolated.
Highlights
Yunnan Province, one of China’s best-known volcanic geothermal areas, is located in southwestern China
Seventeen hot springs and effluent channel samples were collected from ten hot springs and examined based on contrasting characteristics, such as pH, temperature and location in four geothermal regions (Lincang region (Lc), Baoshan region (Bs), Dali region (Dl) and Dehong region (Dh)) of western Yunnan Province, southwestern China
Screening of the Culturable Thermus-Like Strains from the Four Geothermal Regions
Summary
Yunnan Province, one of China’s best-known volcanic geothermal areas, is located in southwestern China. It is located at the collision boundary between the Indian and Eurasian plates and is an integral part of the Mediterranean-Himalayan geothermal belt. As a result of post-volcanism and an active geothermal system, there are many neutral and alkalescent thermal springs in this area. These thermal springs are mainly located in Tengchong County in the Baoshan region, Eryuan County in the Dali region, Yun County in the Lincang region and Lianghe County in the Dehong region of Yunnan Province. For the other geothermal systems, with the exception of a few surveys [19,20], many thermal springs in the Yunnan geothermal area have not yet been studied in detail
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