Increased light availability enhances tolerance against ocean acidification-related stress in the calcifying macroalga Halimedaopuntia  

作　　者：Zhangliang Wei Yating Zhang Fangfang Yang Lijuan Long 

机构地区：[1]Key Laboratory of Tropical Marine Bio-resources and Ecology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [2]Key Laboratory of Tropical Marine Biotechnology of Hainan Province,Sanya Institute of Ocean Eco-Environmental Engineering,South China Sea Institute of Oceanology,Sanya 572000,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Acta Oceanologica Sinica》2022年第12期123-132,共10页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract No.42006129;the Guangzhou Science and Technology Project under contract No.202102021228;the National Key Research and Development Project of China under contract No.2021YFC3100500;the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)under contract No.GML2019ZD0404;the Special Research Assistant Grant Program of the Chinese Academy of Sciences.

摘　　要：Although the adverse impacts of ocean acidification(OA)on marine calcifiers have been investigated extensively,the anti-stress capabilities regulated by increased light availability are unclear.Herein,the interactive effects of three light levels(30μmol photons/(m^(2)·s),150μmol photons/(m^(2)·s),and 240μmol photons/(m^(2)·s)combined with two pCO_(2)concentrations(400 ppmv and 1400 ppmv)on the physiological acclimation of the calcifying macroalga Halimeda opuntia were investigated using a pCO_(2)-light coupling experiment.The OA negatively influenced algal growth,calcification,photosynthesis,and other physiological performances in H.opuntia.The relative growth rate under elevated pCO_(2)conditions significantly declined by 13.14%−41.29%,whereas net calcification rates decreased by nearly three-fold under OA conditions.Notably,increased light availability enhanced stress resistance through the accumulation of soluble organic molecules,especially soluble carbohydrate,soluble protein,and free amino acids,and in combination with metabolic enzyme-driven activities,OA stress was alleviated.The carotenoid content under low light conditions increased markedly,and the rapid light curve of the relative electron transport rate was enhanced significantly by increasing light intensities,indicating that this new organization of the photosynthetic machinery in H.opuntia accommodated light variations and elevated pCO_(2)conditions.Thus,the enhanced metabolic performance of the calcifying macroalga H.opuntia mitigated OA-related stress.

关 键 词：ocean acidification calcifying macroalga light availability soluble organic molecules enzyme-driven activities 

分 类 号：S917.3[农业科学—水产科学]