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Nitrogen Limitation Decreases the Repair Capacity and Enhances Photoinhibition of Photosystem II in a Diatom
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2021-01-26 , DOI: 10.1111/php.13386 Zhenzhen Li 1, 2 , Ting Lan 1 , Jiaojiao Zhang 1 , Kunshan Gao 3 , John Beardall 3, 4 , Yaping Wu 1
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2021-01-26 , DOI: 10.1111/php.13386 Zhenzhen Li 1, 2 , Ting Lan 1 , Jiaojiao Zhang 1 , Kunshan Gao 3 , John Beardall 3, 4 , Yaping Wu 1
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Macronutrient limitation and increased solar exposure coincide with ocean warming-enhanced stratification, with consequences for phytoplankton within the upper mixing layer. In this study, we grew a diatom, Thalassiosira punctigera, under nitrogen-limited and replete conditions for more than 14 generations and investigated both the biochemical composition of treated cells and their photochemical responses to high light and UV exposure. The photosynthetic pigment and the particulate organic nitrogen (PON) content significantly decreased in the low nitrate grown cells, with drastic decline of the absorption of UV absorbing compounds. Under an acute exposure to high light or UV radiation, we observed a significant decline in the photochemical yield along with an increase of nonphotosynthetic quenching (NPQ), with the former lowered and the latter raised in the low-nitrogen grown cells. The results reveal a decreased repair rate and enhanced photoinhibition of the diatom under nitrogen limitation when exposed to increased levels of light and UV radiation, suggesting a higher vulnerability of the diatom phytoplankton under influences of oceanic global change.
中文翻译：
氮限制降低了硅藻中光系统 II 的修复能力并增强了光抑制
大量营养素的限制和日光照射的增加与海洋变暖增强的分层相吻合，对上混合层内的浮游植物产生了影响。在这项研究中，我们种植了一种硅藻Thalassiosira punctigera，在氮限制和充足的条件下超过 14 代，并研究了处理细胞的生化组成及其对高光和紫外线照射的光化学反应。低硝酸盐生长的细胞中光合色素和颗粒有机氮（PON）含量显着降低，紫外吸收化合物的吸收急剧下降。在急性暴露于强光或紫外线辐射下，我们观察到光化学产率显着下降，同时非光合猝灭 (NPQ) 增加，在低氮生长的细胞中，前者降低，后者升高。结果表明，当暴露于更高水平的光和紫外线辐射时，在氮限制下硅藻的修复率降低和光抑制增强，
更新日期：2021-01-26
中文翻译：
氮限制降低了硅藻中光系统 II 的修复能力并增强了光抑制
大量营养素的限制和日光照射的增加与海洋变暖增强的分层相吻合，对上混合层内的浮游植物产生了影响。在这项研究中，我们种植了一种硅藻Thalassiosira punctigera，在氮限制和充足的条件下超过 14 代，并研究了处理细胞的生化组成及其对高光和紫外线照射的光化学反应。低硝酸盐生长的细胞中光合色素和颗粒有机氮（PON）含量显着降低，紫外吸收化合物的吸收急剧下降。在急性暴露于强光或紫外线辐射下，我们观察到光化学产率显着下降，同时非光合猝灭 (NPQ) 增加，在低氮生长的细胞中，前者降低，后者升高。结果表明，当暴露于更高水平的光和紫外线辐射时，在氮限制下硅藻的修复率降低和光抑制增强，
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