

FOLLOWUS
1.Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing 210098, China
2.Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
3.Weihai Vocational College, Weihai 264200, China
4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
Zhengyi LIU, E-mail: zyliu@yic.ac.cn
Received:05 October 2020,
Accepted:05 December 2020,
Online First:09 March 2021,
Published:2022-01
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Jingjing LI, Yunlong PANG, Song QIN, et al. Comparison of the photo-acclimation potential of floating and benthic thalli of
Jingjing LI, Yunlong PANG, Song QIN, et al. Comparison of the photo-acclimation potential of floating and benthic thalli of
Sargassum horneri
is a foundational species and an important contributor to the floating seaweed stock along the northeastern coast of Asia. In this study
benthic and floating thalli of
S. horneri
were collected from Changdao Island (37°54'N
120°43'E)
Bohai Bay
China. We conducted an in-situ and an indoor experiment to study the acclimation potential in
S. horneri
to abiotic conditions at sea surface in autumn and winter. Both benthic and floating thalli were cultured in situ for two months (from October to December) at different depths: 0 m above sea level (masl) and 3 m below sea level (mbsl)
and their growth rate
biochemical content
and photosynthetic performance were compared. During the first month of culture
the relative growth rate of floating thalli was 2-fold greater than that of benthic thalli at 0 masl. The photosynthetic rate of most thalli was significantly higher at 0 masl than at 3 mbsl. In the indoor experiments
floating and benthic thalli were exposed to high light intensity (400 μmol photons/(m
2
·s) photosynthetically active radiation (PAR)) for 21 d
and their photo-acclimation capacities were compared. Under high light intensity
the two types of thalli showed low maximum quantum yield (
F
v
/
F
m
) and light utilisation efficiency (
α
) but high light saturation point (
E
k
). Floating thalli showed higher photosynthetic rate and photoprotective ability than benthic thalli at high light intensity. The effective quantum yield of photosystem II [
Y
(II)] of both types of thalli recovered after a 6-day treatment with low light intensity (40 μmol photons/(m
2
·s)). These findings suggest that
S. horneri
is highly acclimated to the sea surface environment
which possibly contributes to its rapid accumulation and long free-floating periods at the sea surface.
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