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Jiang X, Zhang Y, Hutchins DA, et al. Nitrogen-limitation exacerbates the impact of ultraviolet radiation on the coccolithophore Gephyrocapsa oceanica. J Photochem Photobiol B. 2021;226:112368doi: 10.1016/j.jphotobiol.2021.112368.
Jiang, X., Zhang, Y., Hutchins, D. A., & Gao, K. (2022). Nitrogen-limitation exacerbates the impact of ultraviolet radiation on the coccolithophore Gephyrocapsa oceanica. Journal of photochemistry and photobiology. B, Biology, 226112368. https://doi.org/10.1016/j.jphotobiol.2021.112368
Jiang, Xiaowen, et al. "Nitrogen-limitation exacerbates the impact of ultraviolet radiation on the coccolithophore Gephyrocapsa oceanica." Journal of photochemistry and photobiology. B, Biology vol. 226 (2022): 112368. doi: https://doi.org/10.1016/j.jphotobiol.2021.112368
Jiang X, Zhang Y, Hutchins DA, Gao K. Nitrogen-limitation exacerbates the impact of ultraviolet radiation on the coccolithophore Gephyrocapsa oceanica. J Photochem Photobiol B. 2022 Jan;226:112368. doi: 10.1016/j.jphotobiol.2021.112368. Epub 2021 Nov 23. PMID: 34864530.
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J Photochem Photobiol B. 2022 Jan;226:112368. doi: 10.1016/j.jphotobiol.2021.112368. Epub 2021 Nov 23.

Nitrogen-limitation exacerbates the impact of ultraviolet radiation on the coccolithophore Gephyrocapsa oceanica.

Journal of photochemistry and photobiology. B, Biology

Xiaowen Jiang, Yong Zhang, David A Hutchins, Kunshan Gao

Affiliations

  1. State Key Laboratory of Marine Environmental Science & College of Ocean and Earth Sciences, Xiamen University, Xiamen, China.
  2. State Key Laboratory of Marine Environmental Science & College of Ocean and Earth Sciences, Xiamen University, Xiamen, China; College of Environmental Science and Engineering and Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, China.
  3. Marine and Environmental Biology, University of Southern California, Los Angeles, CA, United States.
  4. State Key Laboratory of Marine Environmental Science & College of Ocean and Earth Sciences, Xiamen University, Xiamen, China; Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang 222005, China. Electronic address: [email protected].

PMID: 34864530 DOI: 10.1016/j.jphotobiol.2021.112368

Abstract

To investigate effects of UV radiation (UVR, 280-400 nm) on coccolithophorids under nutrient-limited conditions, we grew Gephyrocapsa oceanica to determine its resilience to consecutive daily short-term exposures to +UVR (irradiances >295 nm) under a range of nitrate availabilities (100, 24, 12, 6 and 3 μM). +UVR alone significantly hampered the growth of G. oceanica, with the synergistic negative effects of +UVR and N-limitation being about 58% and 22% greater than under UVR or N-limitation alone, respectively. Most 3 μM nitrate cultures died, but those exposed to UVR succumbed sooner. This was due to a failure of photoprotection and repair mechanisms under low N-availability with exposures to UVR. Additionally, the UVR-induced inhibition of the effective quantum yield of photosystem II (PSII) was significantly higher and was further aggravated by N limitation. The algal cells increased photoprotective pigments and UV-absorbing compounds as a priority rather than using calcification for defense against UVR, indicating a trade-off in energy and resource allocation. Our results indicate the negative effects of UVR on coccolithophorid growth and photosynthesis, and highlight the important role of N availability in defense against UVR as well as high PAR. We predict that enhanced N-limitation in future surface oceans due to warming-induced stratification will exacerbate the sensitivity of G. oceanica to UVR, while coccolithophores can be potentially more susceptible to other environmental stresses due to increased levels of nutrient limitation.

Copyright © 2021 Elsevier B.V. All rights reserved.

Keywords: Calcification; Coccolithophore; Gephyrocapsa oceanica; Growth; Nitrate-limitation; Photosynthesis; Phytoplankton; UVR

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