Photosynthetica 2016, 54(2):210-218 | DOI: 10.1007/s11099-015-0169-3

Effects of hypo- and hypersalinity on photosynthetic performance of Sargassum fusiforme (Fucales, Heterokontophyta)

X. J. Xie1,3, X. L. Wang1,3,4, L. D. Lin2, L. W. He1,3, W. H. Gu1,3, S. Gao1,3, X. F. Yan2, G. H. Pan5, M. J. Wu2,*, G. C. Wang1,3,*
1 Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
2 Zhejiang Provincial Key Lab for Water Environment and Marine Biological Resources Protection, College of Life and Environment Science, Wenzhou University, Wenzhou, China
3 Laboratory of Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
4 University of Chinese Academy of Sciences, Beijing, China
5 Tianjin Key Laboratory of Marine Sources and Chemistry, College of Marine Science & Engineering, Tianjin University of Science & Technology, Tianjin, China

Photoprotection mechanisms protect photosynthetic organisms, especially under stress conditions, against photodamage that may inhibit photosynthesis. We investigated the effects of short-term immersion in hypo- and hypersalinity sea water on the photosynthesis and xanthophyll cycle in Sargassum fusiforme (Harvey) Setchell. The results indicated that under moderate light [110 μmol(photon) m-2 s-1], the effective quantum yield of PSII was not reduced in S. fusiforme fronds after 1 h in hyposalinity conditions, even in fresh water, but it was significantly affected by extreme hypersalinity treatment (90‰ sea water). Under high light [HL, 800 μmol(photon) m-2 s-1], photoprotective mechanisms operated efficiently in fronds immersed in fresh water as indicated by high reversible nonphotochemical quenching of chlorophyll fluorescence (NPQ) and de-epoxidation state; the quantum yield of PSII recovered during the subsequent relaxation period. In contrast, fronds immersed in 90‰ sea water did not withstand HL, barely developed reversible NPQ, and accumulated little antheraxanthin and zeaxanthin during HL, while recovery of the quantum yield of PSII was severely inhibited during the subsequent relaxation period. The data provided concrete evidence supporting the short-term tolerance of S. fusiforme to immersion in fresh water compared to hypersalinity conditions. The potential practical implications of these results were also discussed.

Keywords: aquaculture; chlorophyll a fluorescence; dithiothreitol; rapid light curve; violaxanthin

Received: March 19, 2015; Accepted: June 29, 2015; Published: June 1, 2016Show citation

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Xie, X.J., Wang, X.L., Lin, L.D., He, L.W., Gu, W.H., Gao, S., ... Wang, G.C. (2016). Effects of hypo- and hypersalinity on photosynthetic performance of Sargassum fusiforme (Fucales, Heterokontophyta). Photosynthetica, 54(2), 210-218. doi: 10.1007/s11099-015-0169-3.
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