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首页> 外文期刊>Phycological Research >Growth, toxicity and oxidative stress of a cultured cyanobacterium (Dolichospermum sp.) under different CO2/pH and temperature conditions
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Growth, toxicity and oxidative stress of a cultured cyanobacterium (Dolichospermum sp.) under different CO2/pH and temperature conditions

机译：在不同的CO2 / pH和温度条件下培养的蓝藻（Dolichospermum sp。）的生长，毒性和氧化应激

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摘要

Cyanobacteria blooms are a worldwide nuisance in fresh, brackish and marine waters. Changing environmental conditions due to upwelling, changed mixing conditions or climate change are likely to influence cyanobacteria growth and toxicity. In this study, the response of the toxic cyanobacterium Dolichospermum sp. to lowered pH (-0.4 units by adding CO2) and elevated temperature (+4 degrees C) in an experimental set-up was examined. Growth rate, microcystin concentration and oxidative stress were measured. The growth rate and intracellular toxin concentration increased significantly as a response to temperature. When Dolichospermum was exposed to the combination of elevated temperature and high CO2/low pH, lipid peroxidation increased and antioxidant levels decreased. Microcystin concentrations were significantly correlated with growth rates. Our results show, although oxidative stress increases when exposed to a combination of high CO2/low pH and high temperature, that growth and toxicity increase at high temperature, suggesting that the cyanobacterium in general seems to be fairly tolerant to changes in pH and temperature. Further progress in identifying biological responses and predicting climate change consequences in estuaries experiencing cyanobacteria blooms requires a better understanding of the interplay between stressors such as pH and temperature.
机译：蓝藻水华是淡水，微咸水和海水中的全球滋扰。由于上升流，混合条件的变化或气候变化而引起的环境条件的变化可能会影响蓝细菌的生长和毒性。在这项研究中，有毒的蓝细菌Dolichospermum sp。的反应。在实验装置中检查了pH值降低到（通过添加CO2降低到-0.4单位）和高温（+4摄氏度）。测量生长速率，微囊藻毒素浓度和氧化应激。生长速率和细胞内毒素浓度随着温度的升高而显着增加。当Dolichospermum暴露于高温和高CO2 /低pH的组合下时，脂质过氧化作用增加，抗氧化剂水平降低。微囊藻毒素浓度与生长速率显着相关。我们的结果表明，尽管暴露于高CO2 /低pH和高温的组合下氧化应激会增加，但高温下的生长和毒性会增加，这表明蓝细菌总体上似乎对pH和温度的变化相当耐受。在识别蓝藻水华河口的生物反应和预测气候变化后果方面的进一步进展需要更好地了解压力源（例如pH和温度）之间的相互作用。

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