High temperature promotes the inhibition effect of Zn2+ on inducible defense of Scenedesmus obliquus.
High temperature promotes the inhibition effect of Zn2+ on inducible defense of Scenedesmus obliquus.
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DOI：
10.1016/j.chemosphere.2018.10.116
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发表时间：
2019-02
期刊：
影响因子：
8.8
通讯作者：
Xuexia Zhu;Yuanyuan Wang;Xinying Hou;Qingdan Kong;Yunfei Sun;Jun Wang;Yuan Huang;Zhou Yang
中科院分区：
文献类型：
--
作者：
Xuexia Zhu;Yuanyuan Wang;Xinying Hou;Qingdan Kong;Yunfei Sun;Jun Wang;Yuan Huang;Zhou Yang
浮游植物的形态防御被认为是一种有效的抗食草动物的策略，栅藻（Scenedesmus）是一种广泛分布的淡水绿藻，它可以形成群体来响应食草性浮游动物的信息化学物质，并与食草动物共存。然而，诱导型防御反应经常受到非生物或生物因素的干扰，特别是在全球变暖和环境污染日益严重的情况下。在本研究中，两个非致死性的环境因素，即温度升高和环境相关的Zn 2+浓度，减少了由水蚤信息化合物诱导的S.acrus.菌落形成。升高的温度（30 °C）减小了诱导型菌落的大小并缩短了防御型菌落的维持时间。随着Zn ~（2+）浓度的增加，菌落大小逐渐减小。即使在低Zn 2+浓度（0.131 μmol L−1）下，菌落形成也受到抑制，但既不阻碍生长，也不影响光合作用。加温促进了Zn 2+对S. acetonus诱导集落形成的抑制作用。温度升高也增强了Zn 2+的毒性，导致高温下高浓度Zn 2+抑制了藻的生长。特别是在水蚤属环境中形成可诱导菌落的S. peculus对Zn ~（2+）毒性具有较强的耐受性，可能对重金属具有保护作用。结果表明，全球气候变暖和重金属污染的共同作用，对黑腹滨藜的诱导防御产生了更为严重的影响。
Morphological defense is assumed to be an effective anti-grazer strategy in phytoplankton.Scenedesmus obliquus, a globally widespread freshwater chlorophyte, can form colonies in response to the infochemicals of herbivorous zooplankton and survive in coexistence with grazers. However, the inducible defense response is often disturbed by abiotic or biotic factors, especially under the increasing global warming and environmental pollution. In this study, two nonlethal environmental factors, namely, elevated temperature and environmentally relevant Zn2+concentrations, decreased colony formation ofS. obliquusinduced byDaphniagrazing infochemicals. Elevated temperature (30 °C) reduced the inducible colony size and shortened the maintenance time of defensive colonies. Decreased colony size was detected with increased Zn2+concentration. Colony formation was inhibited even at low Zn2+concentration (0.131 μmol L−1), which neither retarded growth nor affected photosynthesis. Warming promoted the inhibition effect of Zn2+on inducible colony formation ofS. obliquus. Warming also enhanced Zn2+toxicity, which caused the growth rate ofS. obliquusto be hindered by high Zn2+concentrations at elevated temperature. Specially,S. obliquuswhich formed inducible colonies under the condition ofDaphniainfochemicals had higher tolerance to Zn2+toxicity and thus likely exerted protective effects against heavy metals. The results indicated the combined effects of global warming and heavy-metal pollution result in more severe impact on the inducible defense ofS. obliquus.