The effects of fluctuating culture temperature on stress tolerance and antioxidase expression in Esteya vermicola
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- 作者：Yun-bo Wang ; Wen-xing Pang ; Xiao-na Yv ; Jing-jie Li…
- 关键词：Esteya vermicola ; fluctuating temperature ; stress tolerance ; antioxidase expression
- 刊名：Journal of Microbiology
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：53
- 期：2
- 页码：122-126
- 全文大小：332 KB
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- 出版者：Springer Netherlands
- ISSN：1976-3794
文摘
The endoparasitic nematophagous fungus, Esteya vermicola, has shown great potential as a biological control agent against the pine wood nematode, Bursaphelenchus xylophilus. Fluctuating culture temperatures can affect fungal yields and fungal tolerance to desiccation, UV radiation, H2O2, and heat stress, as well as antioxidase expression. To explore these effects, E. vermicola cultured under five temperature ranges, 26°C, 15-6°C, 26-5°C, 20-0°C, and 15-5°C, were compared. The cultures grown at lower temperatures showed better growth, stronger tolerance to desiccation, UV, and H2O2 stresses, and increased catalase expression, However, these cultures also showed weaker heat stress tolerance and lower superoxide dismutase expression than the higher-temperature cultures. In particular, the E. vermicola cultured at 20-0°C, i.e., fluctuating in a narrow range around the optimal temperature, showed the best performance. Therefore, for production in practical applications, this narrowly fluctuating, moderate temperature appears to be optimal for yield and stress tolerance in E. vermicola.