Articles | Volume 14, issue 19
https://doi.org/10.5194/bg-14-4455-2017
https://doi.org/10.5194/bg-14-4455-2017
Research article
 | 
11 Oct 2017
Research article |  | 11 Oct 2017

Effects of ultraviolet radiation on photosynthetic performance and N2 fixation in Trichodesmium erythraeum IMS 101

Xiaoni Cai, David A. Hutchins, Feixue Fu, and Kunshan Gao

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Cited articles

Anning, T., Maclntyre, H. L., Sammes, S. M. P. a. P. J., Gibb, S., and Geider, R. J.: Photoacclimation in the marine diatom Skeletonema costatum, Limnol. Oceanogr., 45, 1807–1817, 2000.
Banaszak, A. T.: Photoprotective physiological and biochemical responses of aquatic organisms, in: UV effects in aquatic organisms and ecosystems, edited by: Helbling, E. W. and Zagarese, H. E., Comprehensive Series in Photosciences, Royal Society of Chemistry, Cambridge, UK, 329–356, 2003.
Breitbarth, E., Mills, M. M., Friedrichs, G., and LaRoche, J.: The Bunsen gas solubility coefficient of ethylene as a function of temperature and salinity and its importance for nitrogen fixation assays, Limnol. Oceanogr.-Meth., 2, 282–288, 2004.
Cai, X., Gao, K., Fu, F., Campbell, D., Beardall, J., and Hutchins, D.: Electron transport kinetics in the diazotrophic cyanobacterium Trichodesmium spp. grown across a range of light levels, Photosyn. Res., 124, 45–56, https://doi.org/10.1007/s11120-015-0081-5, 2015.
Campbell, D., Eriksson, M. J., Oquist, G., Gustafsson, P., and Clarke, A. K.: The cyanobacterium Synechococcus resists UV-B by exchanging photosystem II reaction-center D1 proteins, P. Natl. Acad. Sci. USA, 95, 364–369, 1998.
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Short summary
Trichodesmium is significant marine N2 fixer. We conducted short- and long-term UV exposure experiment to investigate how UV affects this organism. Our results showed N2 fixation and carbon fixation rates were significantly reduced under UV radiation. As a defense strategy, Trichodesmium is able to synthesize UV-absorbing compounds to protect from UV damage. Our results suggest that shipboard experiments in UV-opaque containers may have substantially overestimated in situ N2 fixation rate.
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