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首页> 外文期刊>Applied Microbiology and Biotechnology >Thermophilic bacteria in cool temperate soils: are they metabolically active or continually added by global atmospheric transport?
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Thermophilic bacteria in cool temperate soils: are they metabolically active or continually added by global atmospheric transport?

机译：凉爽的温带土壤中的嗜热细菌：它们是否具有代谢活性，还是通过全球大气传输而不断添加？

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摘要

Thermophilic soil geobacilli isolated from cool temperate geographical zone environments have been shown to be metabolically inactive under aerobic conditions at ambient temperatures (−5 to 25°C). It is now confirmed that a similar situation exists for their anaerobic denitrification activity. It is necessary therefore to determine the mechanisms that sustain the observed significant viable populations in these soils. Population analysis of thermophiles in rainwater and air samples has shown different species compositions which support the view that long distance global transport and deposition in rainwater is a possible source of replenishment of the soil thermophile populations. Survival experiments using a representative Geobacillus isolate have indicated that while cells lose viability rapidly at most temperatures, populations can increase only when the temperature allows growth to take place at a rate which exceeds death rate. Long term (9-month) experiments at 4°C show population increases which can be accounted for by very slow growth rates complemented by negligible death rates. These results are interpreted in the context of current hypotheses on the biogeography patterns of bacteria.
机译：从凉爽的温带地理区域环境中分离出来的嗜热土壤土杆菌在环境温度（-5至25°C）下的好氧条件下表现为无代谢活性。现在已经证实，它们的厌氧反硝化活性也存在类似的情况。因此，有必要确定在这些土壤中维持观察到的大量可行种群的机制。雨水和空气样本中嗜热菌的种群分析表明，不同的物种组成支持以下观点：雨水中的长距离全球运输和沉积是土壤嗜热菌种群补充的可能来源。使用代表性的地芽孢杆菌分离株进行的存活实验表明，尽管细胞在大多数温度下会迅速丧失活力，但只有在温度允许细胞以超过死亡率的速率生长时，种群才能增加。在4°C下进行的长期（9个月）实验表明，人口增长可能是由非常缓慢的增长速度和可忽略的死亡率所致。这些结果是在细菌生物地理模式的当前假设的背景下解释的。

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