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首页> 外文期刊>Journal of Experimental Botany >Three different mechanisms of energy dissipation of a desiccation-tolerant moss serve one common purpose: to protect reaction centres against photo-oxidation.
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Three different mechanisms of energy dissipation of a desiccation-tolerant moss serve one common purpose: to protect reaction centres against photo-oxidation.

机译：耐干燥的苔藓的三种不同的能量耗散机制具有一个共同的目的：保护反应中心免受光氧化。

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摘要

Three different types of non-photochemical de-excitation of absorbed light energy protect photosystem II of the sun- and desiccation-tolerant moss Rhytidium rugosum against photo-oxidation. The first mechanism, which is light-induced in hydrated thalli, is sensitive to inhibition by dithiothreitol. It is controlled by the protonation of a thylakoid protein. Other mechanisms are activated by desiccation. One of them permits exciton migration towards a far-red band in the antenna pigments where fast thermal deactivation takes place. This mechanism appears to be similar to a mechanism detected before in desiccated lichens. A third mechanism is based on the reversible photo-accumulation of a radical that acts as a quencher of excitation energy in reaction centres of photosystem II. On the basis of absorption changes around 800 nm, the quencher is suggested to be an oxidized chlorophyll. The data show that desiccated moss is better protected against photo-oxidative damage than hydrated moss. Slow drying of moss thalli in the light increases photo-protection more than slow drying in darkness.
机译：三种不同类型的吸收光能的非光化学除激可以保护耐日晒和耐干燥的苔藓Rhytidium rugosum的光系统II免受光氧化。在水合thalli中光诱导的第一种机制对二硫苏糖醇的抑制敏感。它由类囊体蛋白的质子化控制。其他机制通过干燥来激活。其中之一允许激子向天线色素中的远红色带迁移，在那里快速发生热失活。该机制似乎与之前在干燥地衣中检测到的机制相似。第三种机制基于自由基的可逆光累积，该自由基在光系统II的反应中心中充当激发能的猝灭剂。根据800 nm附近的吸收变化，建议淬灭剂是氧化的叶绿素。数据表明，干燥的苔藓比水合的苔藓能更好地防止光氧化损伤。与在黑暗中缓慢干燥相比，在光中缓慢干燥苔藓藻类对光的保护作用更大。

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