Roles of the transthylakoid proton gradient and xanthophyll cycle in the non-photochemical quenching of the green alga Ulva linza
Roles of the transthylakoid proton gradient and xanthophyll cycle in the non-photochemical quenching of the green alga Ulva linza
复制标题
跨类囊体质子梯度和叶黄素循环在绿藻石莼非光化学猝灭中的作用
DOI：
10.1016/j.ecss.2014.09.006
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发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
Ye Naihao
中科院分区：
文献类型：
--
作者：
Cao Shaona;Fan Xiao;Xu Dong;Ye Naihao
非光化学猝灭（NPQ）是光合生物在过量辐射下最重要的光保护机制之一。NPQ的基本原理是将过量吸收的光作为热安全耗散，在所有光合自养生物中是相同的。然而，在不同的光养生物中，其调节和结构机制存在着重要的差异。本文研究了绿色海藻石莼（Ulva linza）中的NPQ与抑制剂偶联，在强光条件下改变类囊体质子梯度（ΔpH）的幅度和/或叶黄素循环（XC）的去氧化。数据表明，NPQ在照射的第一分钟内开始快速初始上升，随后在淬灭进一步上升之前下降。在整个反应过程中，NPQ完全由ΔpH触发和控制，然后被玉米黄质强化和调节。与植物和其他绿色藻类相比，linza中的NPQ松弛较慢，这可能主要是由于玉米黄质向紫黄质的转化较慢所致。XC在很大程度上控制了林泽裸藻的NPQ，这可能是其在海岸生态系统中成功定殖的一种适应机制。
Non-photochemical quenching (NPQ) is one of the most important photoprotection mechanisms in photosynthetic organisms when they are exposed to excessive irradiation. The basic principle of NPQ, which is the safe dissipation of excessive absorbed light as heat, is identical in all photoautotrophs. However, crucial differences in its regulation and structural mechanisms exist in different phototrophs. Here, we investigated NPQ in the green algaUlva linzacoupled with inhibitors to alter the amplitude of the transthylakoid proton gradient (ΔpH) and/or de-expoxidation of xanthophyll cycle (XC) under high light conditions. The data demonstrates that NPQ started with a rapid initial rise within the first minute of illumination, followed by a decline before a further rise in quenching. During the whole phase, NPQ was triggered and completely controlled by ΔpH, then strengthened and modulated by zeaxanthin. NPQ relaxation was slower inU. linzawhen compared to plants and other green algae, and it may be mainly caused by the slow conversion of zeaxanthin to violaxanthin. NPQ inU. linzais controlled to a greater extent by XC, which show more similarities toArabidopsisthan toChlamydomonasand may be an adaptive mechanism for its successful colonization of coastal ecosystems.
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