High salt stress in the upper part of floating mats of Ulva prolifera , a species that causes green tides, enhances non‐photochemical quenching
High salt stress in the upper part of floating mats of Ulva prolifera , a species that causes green tides, enhances non‐photochemical quenching
复制标题
石莼（一种引起绿潮的物种）浮垫上部的高盐胁迫增强了非光化学猝灭
DOI：
10.1111/jpy.12881
复制
发表时间：
2019
影响因子：
2.9
通讯作者：
Guangce Wang
中科院分区：
文献类型：
--
作者：
Zhenbing Zheng;Shan Gao;Guangce Wang
盐胁迫是一种主要的非生物胁迫因子，对光合生物产生许多不利影响。植物和藻类已经发展出几种机制来帮助它们对不利的环境做出反应。非光化学猝灭（NPQ）是这些机制之一。附着在岩石上的潮间带藻类的菌体可因潮汐的涨落而受到短时间的盐胁迫，石莼增殖引起绿色潮，当出现绿色潮时，菌体上部长期受到高盐胁迫，可形成漂浮席。在本研究中，我们比较了石莼增殖光合成活性和NPQ动力学时，它受到不同的盐度在不同的时间。盐度为90时，藻体的NPQ显著增加，而光合活性从60 min开始下降。这说明盐胁迫下石莼增殖体NPQ的诱导与胁迫程度和胁迫时间密切相关。暴露4d后，处理样品的NPQ增强，这可能解释了石莼形成的浮垫上层能够在恶劣环境中存活的原因。进一步的抑制剂实验表明，增强的NPQ是叶黄素循环和转类囊体质子梯度依赖性的。然而，光系统II亚基S和捕光复合物应激相关蛋白没有过度积累，可能不是NPQ增强的原因。
Salt stress is a major abiotic stress factor that can induce many adverse effects on photosynthetic organisms. Plants and algae have developed several mechanisms that help them respond to adverse environments. Non‐photochemical quenching (NPQ) is one of these mechanisms. The thalli of algae in the intertidal zone that are attached to rocks can be subjected to salt stress for a short period of time due to the rise and fall of the tide.Ulva proliferacauses green tides and can form floating mats when green tides occur and the upper part of the thalli is subjected to high salt stress for a long period of time. In this study, we compared theUlva proliferaphotosynthetic activities and NPQ kinetics when it is subjected to different salinities over various periods of time. Thalli exposed to a salinity of 90 for 4 d showed enhanced NPQ, and photosynthetic activities decreased from 60 min after exposure up to 4 d. This indicated that the induction of NPQ inUlva proliferaunder salt stress was closely related to the stressing extent and stressing time. The enhanced NPQ in the treated samples exposed for 4 d may explain why the upper layer of the floating mats formed byUlva proliferathalli were able to survive in the harsh environment. Further inhibitor experiments demonstrated that the enhanced NPQ was xanthophyll cycle and transthylakoid proton gradient‐dependent. However, photosystem II subunit S and light‐harvesting complex stress‐related protein didn't over accumulate and may not be responsible for the enhanced NPQ.