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Comparison of the photo-acclimation potential of fl oating and benthic thalli of Sargassum horneri(Phaeophyta)during autumn and winter

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Journal of Oceanology and Limnology 2022年第1期40卷 195-205页

作者： Jingjing LI Yunlong PANG Song QIN Zhengyi LIU Zhihai ZHONG Wanlin SONG Longchuan ZHUANG Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China Yantai Institute of Coastal Zone Research Chinese Academy of SciencesYantai 264003China Weihai Vocational College Weihai 264200China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Sargassum horneri is a foundational species and an important contributor to the fl oating seaweed stock along the northeastern coast of *** this study,benthic and fl oating thalli of *** were collected from Changdao Island(37°54′N,120°43′E),Bohai Bay,*** conducted an in-situ and an indoor experiment to study the acclimation potential in *** to abiotic conditions at sea surface in autumn and *** benthic and fl oating thalli were cultured in situ for two months(from October to December)at diff erent depths:0 m above sea level(masl)and 3 m below sea level(mbsl),and their growth rate,biochemical content,and photosynthetic performance were *** the fi rst month of culture,the relative growth rate of fl oating thalli was 2-fold greater than that of benthic thalli at 0 *** photosynthetic rate of most thalli was signifi cantly higher at 0 masl than at 3 *** the indoor experiments,fl oating and benthic thalli were exposed to high light intensity(400μmol photons/(m^(2)·s)photosynthetically active radiation(PAR))for 21 d,and their photo-acclimation capacities were *** high light intensity,the two types of thalli showed low maximum quantum yield(F_(v)/F_(m))and light utilisation effi ciency(α)but high light saturation point(E_(k)).floating thalli showed higher photosynthetic rate and photoprotective ability than benthic thalli at high light *** eff ective quantum yield of photosystem II[Y(II)]of both types of thalli recovered after a 6-day treatment with low light intensity(40μmol photons/(m^(2)·s)).These fi ndings suggest that *** is highly acclimated to the sea surface environment,which possibly contributes to its rapid accumulation and long free-fl oating periods at the sea surface.

关键词： chlorophyll-a fl uorescence growth photosynthesis photosynthetic pigments Sargassum horneri

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