论文
论文标题: Survival, recovery and microcystin release of Microcystis aeruginosa in cold or dark condition
作者: Ding Yi; Gan Nanqin; Liu Jin; Zheng Lingling; Li Lin; Song Lirong
出版刊物: CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
出版日期: MAR
出版年份: 2017
卷/期: 2
DOI: 10.1007/s00343-016-5215-x
论文摘要: Microcystis often dominates phytoplankton in eutrophic lakes and must survive a long period of cold or dark conditions. However, the survival strategies of Microcystis to withstand cold or dark stress are less well known. In this study, we conducted experiments on the responses of two toxic Microcystis aeruginosa strains (FACHB-905 and FACHB-915) and their microcystin release in conditions of low temperature (15 degrees C or 4 degrees C, with illumination) or darkness, and subsequent recovery in standard conditions (25 degrees C with illumination). On exposure to 15 degrees C, a small decrease in cell viability was observed, but the cell number increased gradually, suggesting that M. aeruginosa FACHB-905 and FACHB-915 cells seem in general tolerant in 15 degrees C. Interestingly, our results show that a higher carotenoid content and microcystin release potentially enhance the fitness of surviving cells at 15 degrees C. M. aeruginosa cells exposed to lower temperature light stress (4 degrees C) did not completely lose viability and retained the ability to reinitiate growth. In darkness, the maximum quantum yield (F-v/F-m) and the maximum electron transport rate (ETRmax) values and cell viability of M. aeruginosa cells gradually decreased with time. During the recovery period, the photosynthetic efficiency of M. aeruginosa reverted to the normal level. Additionally, M. aeruginosa FACHB-905 and FACHB-915 exposed to low temperature had increased caspase-3-like activity and DNA fragmentation, which suggests the occurrence of a type of cell death in M. aeruginosa cells under cold stress similar to programmed cell death. Overall, our findings could confer certain advantages on the Microcystis for surviving cold or dark conditions encountered in the annual cycle, and help explain its repeated occurrence in water blooms in large and shallow lakes.
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  • 中国科学院藻类生物学重点实验室
  • 农业部淡水养殖病害防治重点实验室
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  • 湖北省海洋湖沼学会
  • 中国动物学会原生动物学分会
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  • 中国鱼类学会
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  • 水生生物博物馆
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