Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 147, Issue -, Pages 95-103Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2017.11.014
Keywords
Diatom; Nonphotochemical quenching; Ocean acidification; Warming; Photoprotection; Photoinactivation
Categories
Funding
- National Natural Science Foundation of China [31270452, 91647207, 41376129, 41476097]
- Chinese Ministry of Education [213026A]
- Natural Science Foundation of Hubei Province [2014CFB607]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1701003A]
- Science and Technology Bureau of Lianyungang [SH1606]
- Science Foundation of Huaihai Institute of Technology [Z2016007]
- Priority Academic Program Development of Jiangsu Higher Education Institutions of China
- Canada Research Chairs
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Diatoms, as important contributors to aquatic primary production, are critical to the global carbon cycle. They tend to dominate phytoplankton communities experiencing rapid changes of underwater light. However, little is known regarding how climate change impacts diatoms' capacity in coping with variable light environments. Here we grew a globally abundant diatom T. weissflogii, under two levels of temperature (18, 24 degrees C) and pCO(2) (400, 1000 mu atm), and then treated it with a light challenge to understand the combined effects of ocean warming and acidification on its exploitation of variable light environments. The higher temperature increased the photoinactivation rate at 400 mu atm pCO(2) and the higher pCO(2) alleviated the negative effect of the higher temperature on PSII photoinactivation. Temperature did not affect the PsbA removal rate, but higher pCO(2) stimulated PsbA removal. Photoinactivation outran repair, leading to decreased maximum photochemical yield in PSII. The higher pCO(2) induced high sustained phase of nonphotochemical quenching when cells were less photoinhibited. The high light exposure induced the activity of both superoxide dismutase (SOD) and catalase (CAT) and the higher temperature stimulated them further, with insignificant effect of pCO(2). Our findings suggest that ocean warming, ocean acidification and high light exposure would interact on PSII function and protection, and combination of these three environmental factors would lead to a reduced PSII activity in T. weissflogii. This study provides helpful insight into how climate change variables combined with local stressor impact diatoms' photosynthetic physiology.
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