A siphonous morphology affects light-harvesting modulation in the intertidal green macroalga Bryopsis corticulans (Ulvophyceae).
A siphonous morphology affects light-harvesting modulation in the intertidal green macroalga Bryopsis corticulans (Ulvophyceae).
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DOI：
10.1007/s00425-018-2854-5
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发表时间：
2018-06
期刊：
影响因子：
4.3
通讯作者：
Ruban AV
中科院分区：
文献类型：
--
作者：
Giovagnetti V;Han G;Ware MA;Ungerer P;Qin X;Wang WD;Kuang T;Shen JR;Ruban AV
大鳞藓Bryopsis corticulans依靠持续的保护性NPQ和独特的身体结构来有效地适应潮间带海岸的极端光照变化。在低潮期间，潮间带藻类经历长时间的高光胁迫。因此，需要有效地耗散多余的光能，测量叶绿素荧光的非光化学猝灭（NPQ），以避免光损伤。摘要研究了潮间带大型拟苔藓植物在强光和空气中的捕光调节。光合能力和NPQ动力学进行了评估，在不同的细丝层的藻簇和完整的叶绿体解开NPQ的性质，在这个虹吸绿色的植物。结果表明，B的形貌和色素组成与其表面活性剂的含量有关。皮质体提供了表面阳光照射的细丝（保护状态）和那些在下面并经历严重光衰减的细丝（光捕获状态）之间的功能隔离。在表面细丝中，逐渐形成非常高且持续的NPQ。NPQ诱导是由类囊体质子梯度的形成触发的，不依赖于叶黄素循环。PsbS和LHCSR蛋白似乎在该藻类激活的NPQ机制中不活跃。结果表明，B.皮层通过持续的保护性NPQ来承受过多的光能压力，这与光损伤无关，如在黑暗中光系统II（PSII）功能异常快速的恢复所揭示的。这可能意味着发生短暂的PSII光失活或PSII修复周期的快速速率。
The macroalga Bryopsis corticulans relies on a sustained protective NPQ and a peculiar body architecture to efficiently adapt to the extreme light changes of intertidal shores. During low tides, intertidal algae experience prolonged high light stress. Efficient dissipation of excess light energy, measured as non-photochemical quenching (NPQ) of chlorophyll fluorescence, is therefore required to avoid photodamage. Light-harvesting regulation was studied in the intertidal macroalga Bryopsis corticulans, during high light and air exposure. Photosynthetic capacity and NPQ kinetics were assessed in different filament layers of the algal tufts and in intact chloroplasts to unravel the nature of NPQ in this siphonous green alga. We found that the morphology and pigment composition of the B. corticulans body provides functional segregation between surface sunlit filaments (protective state) and those that are underneath and undergo severe light attenuation (light-harvesting state). In the surface filaments, very high and sustained NPQ gradually formed. NPQ induction was triggered by the formation of transthylakoid proton gradient and independent of the xanthophyll cycle. PsbS and LHCSR proteins seem not to be active in the NPQ mechanism activated by this alga. Our results show that B. corticulans endures excess light energy pressure through a sustained protective NPQ, not related to photodamage, as revealed by the unusually quick restoration of photosystem II (PSII) function in the dark. This might suggest either the occurrence of transient PSII photoinactivation or a fast rate of PSII repair cycle.
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从虹吸绿藻 Bryopsis corticulans 中分离的叶绿素-蛋白质复合物的表征
影响因子：
3.7
作者：
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DOI：
10.1016/j.jphotobiol.2015.09.010
发表时间：
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影响因子：
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作者：
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影响因子：
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DOI：
10.1073/pnas.2533072100
发表时间：
2003-12-09
影响因子：
11.1
作者：
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通讯作者：
Szabò, I