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首页> 外文期刊>Marine biology >Relationship between photosynthesis and non-photochemical quenching of chlorophyll fluorescence in two red algae with different carotenoid compositions
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Relationship between photosynthesis and non-photochemical quenching of chlorophyll fluorescence in two red algae with different carotenoid compositions

机译：类胡萝卜素成分不同的两种红藻光合作用与叶绿素荧光非光化学猝灭的关系

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摘要

Algae are continuously exposed to short-term fluctuations in irradiance. We investigate how two red algae species regulate photosynthetic efficiency to cope with such changes and identify some strategies that differ from higher plants. Two red algae, Gracilaria doming-ensis and Kappaphycus alvarezii, with antheraxanthin and lutein as major xanthophylls, respectively, reacted to the onset of low light (below E_k) with a substantial decrease of NPQ. This is different from higher plants, but similar to previous observations in, e.g. cyanobac-teria where it indicates an increase in the effective absorbance cross-section of Photosystem II (PSII) by state transition. Kinetic studies in continuous light revealed a high susceptibility of PSII to light stress ((1-q_P)/ NPQ) in K. alvarezii immediately after the sudden onset of high light, followed by a decrease. This was caused by a slower onset of NPQ in K. alvarezii, followed by acclimation. In G. domingensis, susceptibility of PSII to light stress was stable with time, but absolute values of (1-q_P)/NPQ were higher than in K. alvarezii. These observations suggest that K. alvarezii may be better adapted to high light levels, but is less well prepared for large sudden changes in irradiation. In K. alvarezii, photosynthesis continued to increase with increasing irradiation when NPQ was saturated. As (1-q_P) and NPQ were still balanced in this situation, most likely, processes other than photosynthetic oxygen release are responsible for the increasing net O_2 production observed.
机译：藻类持续暴露于短期的辐照度波动中。我们研究了两种红藻如何调节光合作用效率以应对这种变化，并确定了一些与高等植物不同的策略。两种黄藻，分别以花药黄素和叶黄素为主要叶黄素的是Gracilaria doming-ensis和Kappaphycus alvarezii，对弱光的发生（E_k以下）起了反应，NPQ显着降低。这与高等植物不同，但与以前的观察类似，例如cyanobac-teria，通过状态转换指示光系统II（PSII）的有效吸收截面增加。连续光下的动力学研究表明，高光突然发作后，阿尔瓦雷氏假单胞菌对光胁迫（（1-q_P）/ NPQ）的PSII的敏感性很高，随后又有所下降。这是由于阿尔瓦雷氏假单胞菌NPQ的起效较慢，然后进行了适应。在G. domingensis中，PSII对光胁迫的敏感性随时间稳定，但（1-q_P）/ NPQ的绝对值高于K. alvarezii。这些观察结果表明alvarezii K.可能更适合高光水平，但对于辐照的突然大变化则准备不足。在NPK饱和的情况下，K。alvarezii的光合作用随着辐射的增加而继续增加。由于在这种情况下（1-q_P）和NPQ仍处于平衡状态，因此最有可能的原因是，光合作用的氧气释放以外的过程也导致观察到的净O_2产量增加。

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