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首页> 美国卫生研究院文献>PLoS Clinical Trials >Photosynthetic recovery and acclimation to excess light intensity in the rehydrated lichen soil crusts
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Photosynthetic recovery and acclimation to excess light intensity in the rehydrated lichen soil crusts

机译：复水的地衣土壤结皮的光合恢复和对光强的适应

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摘要

As an important successional stage and main type of biological soil crusts (BSCs) in Shapotou region of China (southeastern edge of Tengger Desert), lichen soil crusts (LSCs) often suffer from many stresses, such as desiccation and excess light intensity. In this study, the chlorophyll fluorescence and CO2 exchange in the rehydrated LSCs were detected under a series of photosynthetically active radiation (PAR) gradients to study the photosynthetic acclimation of LSCs. The results showed that although desiccation leaded to the loss of photosynthetic activity in LSCs, the fluorescence parameters including Fo, Fv and Fv/Fm of LSCs could be well recovered after rehydration. After the recovery of photosynthetic activity, the effective photosynthetic efficiency ΦPSII detected by Imaging PAM had declined to nearly 0 within both the lichen thallus upper and lower layers when the PAR increased to 200 μE m-2 s-1, however the net photosynthesis detected by the CO2 gas analyzer in the LSCs still appeared when the PAR increased to 1000 μE m-2 s-1. Our results indicate that LSCs acclimating to high PAR, on the one hand is ascribed to the special structure in crust lichens, making the incident light into the lichen thallus be weakened; on the other hand the massive accumulation of photosynthetic pigments in LSCs also provides a protective barrier for the photosynthetic organisms against radiation damage. Furthermore, the excessive light energy absorbed by crust lichens is also possibly dissipated by the increasing non-photochemical quenching, therefore to some extent providing some protection for LSCs.
机译：作为中国沙坡头地区（腾格里沙漠东南缘）的重要演替阶段和生物土壤地壳（BSC）的主要类型，地衣土壤地壳（LSC）经常遭受许多压力，例如干燥和过高的光强。在这项研究中，在一系列光合有效辐射（PAR）梯度下检测复水的LSC中的叶绿素荧光和CO2交换，以研究LSC的光合适应性。结果表明，尽管脱水导致LSCs的光合活性丧失，但复水后LSCs的荧光参数包括Fo，Fv和Fv / Fm可以很好地恢复。光合活性恢复后，当PAR增加至200μEm -2 s -1 ，但是当PAR增加到1000μEm -2 s -1 时，二氧化碳气体分析仪在LSC中检测到的净光合作用仍然出现。 。我们的研究结果表明，适应于高PAR的LSC一方面归因于地衣地衣的特殊结构，从而使进入地衣chen的入射光减弱了；另一方面，LSCs中光合色素的大量积累也为光合生物提供了防止辐射损害的保护性屏障。此外，越来越多的非光化学猝灭也可能消散地衣吸收的多余光能，因此在某种程度上为LSC提供了一定的保护。

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