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首页> 外文期刊>Journal of Photochemistry and Photobiology, B. Biology: Official Journal of the European Society for Photobiology >Temperature benefits the photosynthetic performance of the diatoms Chaetoceros gracilis and Thalassiosira weissflogii when exposed to UVR
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Temperature benefits the photosynthetic performance of the diatoms Chaetoceros gracilis and Thalassiosira weissflogii when exposed to UVR

机译：暴露于紫外线下，温度有利于硅藻Chaetoceros gracilis和Thalasiosira weissflogii的光合性能

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摘要

The aim of this study was to assess the combined effects of temperature and UVR on the photosynthesis performance of two diatoms - Chaetoceros gracilis and Thalassiosira weissflogii. In particular, we evaluated the role of UVR in inducing photoinhibition and the potential mitigation of this negative effect by an increase in temperature. Cultures were pre-acclimated at two temperatures - 18°C and 23 °C - and exposed to different radiation treatments - UVR + PAR (280-700 nm); UV-A + PAR (315-700 nm) and PAR only (400-700 nm) under two temperatures: 18 °C (local surface summer water temperature) and 23 °C (simulating a potential increase estimated by the year 2100). Exposure to natural solar radiation resulted in UVR-induced photoinhibition that was significantly higher in T. weissflogii than in C. gracilis. Both species benefited from the higher temperature (23 °C) resulting in a lower photoinhibition as compared to samples exposed at 18 °C. Inter-specific differences were determined in regard to the heat dissipation processes (NPQ) which were higher at high temperatures, and much more evident in C. gracilis than in T. weissflogii. The analyses of inhibition and recovery rates under different irradiances indicate that the balance between negative (inhibition) and positive (repair-dissipation) effects shifted towards a more positive balance with increasing temperature. Our results highlight for a beneficial effect of temperature on photosynthesis performance during exposure to UVR, although important inter-specific differences are found, probably due to differences in cell size as well as in their distribution within the oceanic realm (i.e., coastal versus oceanic species).
机译：这项研究的目的是评估温度和UVR对两种硅藻-Chaetoceros gracilis和Thalassiosira weissflogii的光合作用性能的综合影响。特别是，我们评估了UVR在诱导光抑制中的作用以及温度升高可能减轻的这种负面影响。将培养物在18°C和23°C的两个温度下预适应，并暴露于不同的辐射处理下-UVR + PAR（280-700 nm）; UV-A + PAR（315-700 nm）和仅PAR（400-700 nm）在以下两种温度下：18°C（当地夏季表面水温）和23°C（模拟到2100年估计的潜在增加）。暴露于自然太阳辐射下，导致UVR诱导的光抑制作用在魏氏梭菌中明显高于纤毛梭菌。与在18°C下暴露的样品相比，这两个物种均受益于较高的温度（23°C），从而导致较低的光抑制作用。确定了关于散热过程（NPQ）的种间差异，该差异在高温下更高，而在纤毛梭菌中比在魏氏梭菌中更为明显。对不同辐照度下的抑制率和回收率的分析表明，随着温度的升高，负（抑制）和正（修复耗散）效应之间的平衡会向更正的平衡转移。尽管发现了重要的种间差异，这可能是由于细胞大小及其在海洋域（即沿海物种与海洋物种）中的分布差异所致，尽管我们发现重要的种间差异，但我们的结果强调了温度对暴露于UVR期间光合作用性能的有益影响。 ）。

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