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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Impact of bleaching conditions on the components of non-photochemical quenching in the zooxanthellae of a coral
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Impact of bleaching conditions on the components of non-photochemical quenching in the zooxanthellae of a coral

机译：漂白条件对珊瑚虫黄藻非光化学猝灭成分的影响

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Mass coral bleaching events are a worldwide phenomenon, which generally occur during periods of elevated sea surface temperature and intense sunlight. These conditions result in a decline in photochemical efficiency of symbiotic microalgae (zooxanthellae) which ultimately leads to the expulsion of these symbionts. The physiological mechanism which triggers the release of the zooxanthellae has yet to be adequately determined. Under bleaching conditions, non-photochemical quenching (NPQ) is used to dissipate excess energy from photosystem II (PSII). NPQ was partitioned into three components, (energy dependent quenching [qE], state transition quenching [qT] and photoinhibitory quenching [qI]), based on relaxation kinetics upon addition of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and darkening. This investigation revealed that for corals not exposed to bleaching stress, qE was the principle means of energy dissipation (～60% of the total NPQ). In corals exposed to either high-light (475 μmol photons m~(-2) s~(-1) and 25℃) or elevated temperature (225 μmol photons m~(-2) s~(-1) and 32℃) treatments, the dominant component of NPQ was qE and the relative proportions did not change during the exposure period (1-8 h). When exposed to bleaching conditions (475 umol photons m~(-2) s~(-1) and 32℃) the contribution of the different components changed after 4 h and the total NPQ increased. At this time, the contribution of qT to the total NPQ significantly increased to equal that of qE (40%), suggesting state transitions become more important under such conditions. Throughout the exposure period in all treatments, no change in the proportion of qI was observed.
机译：大规模的珊瑚白化事件是一种全球性现象，通常发生在海面温度升高和强烈阳光照射期间。这些条件导致共生微藻（zooxanthellae）的光化学效率下降，最终导致这些共生菌的排出。触发人兽黄藻释放的生理机制尚未充分确定。在漂白条件下，使用非光化学猝灭（NPQ）消散来自光系统II（PSII）的多余能量。根据添加3-（3,4-二氯苯基）-1,1-的弛豫动力学，NPQ被分为三个部分（能量依赖性猝灭[qE]，状态转变猝灭[qT]和光抑制猝灭[qI]）。二甲基脲（DCMU）和变黑。这项调查表明，对于未遭受漂白应​​力的珊瑚，qE是能量消散的主要手段（约占总NPQ的60％）。在暴露于高光（475μmol光子m〜（-2）s〜（-1）和25℃）或高温（225μmol光子m〜（-2）s〜（-1）和32℃的珊瑚中）处理中，NPQ的主要成分是qE，相对比例在暴露期间（1-8小时）没有变化。当暴露于漂白条件下（475 umol光子m〜（-2）s〜（-1）和32℃）时，不同组分的贡献在4 h后发生变化，总NPQ增加。此时，qT对总NPQ的贡献显着增加，等于qE的贡献（40％），这表明在这种情况下状态转换变得更加重要。在所有治疗的整个暴露期中，未观察到qI比例的变化。

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