高温和高盐对Nitrosomonas eutropha CZ-4的交叉保护效应

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Abstract To study the combined influence of high-temperature and high salinity on the nitrosation activity of Nitrosomonas, the cross-tolerance of Nitrosomonas eutropha CZ-4 to high-temperature and high salinity by short-term cross-experiment at different salinities and temperatures was investigated. Also, stress experiments were performed after long-term preacclimation, and the extracellular polymeric substance content was measured. Results showed the optimal salt concentration increased gradually from 2g/L to 18g/L when the temperature increased from 28℃ to 40℃, and high salinity/high-temperature significantly alleviated the inhibition by high-temperature/high salinity, respectively. The heat tolerance was significantly improved by the high salinity preacclimation, and the salt tolerance also significantly improved by the high-temperature preacclimation. After preacclimation in high-temperature or high salinity conditions, the bound-polysaccharide content significantly increased compared that of cells cultured in low-temperature and low-salinity conditions. The results not only prove the physiological cross-tolerance of CZ-4 to high-temperature and high salinity, but also prove the accumulation of the extracellular bound-polysaccharide of CZ-4 at high-temperature or high salinity conditions.

Key words： deamination AOB salinity temperature environmental stress

Received: 02 August 2022

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X172

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	YANG Rui
	GE Hong-mei
	CHENG Kai

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YANG Rui,GE Hong-mei,CHENG Kai. Cross-tolerance of Nitrosomonas eutropha CZ-4 to high-temperature and high salinity[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1378-1385.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1378

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