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GAO Yaping, JIANG Zengjie, DU Meirong, FANG Jinghui, JIANG Weiwei, FANG Jianguang. Photosynthetic and metabolic responses of eelgrass Zostera marina L. to short-term high-temperature exposure[J]. HaiyangYuHuZhao, 2019, 37(1): 199-209

Photosynthetic and metabolic responses of eelgrass Zostera marina L. to short-term high-temperature exposure

GAO Yaping1,3, JIANG Zengjie2,4, DU Meirong2,4, FANG Jinghui2, JIANG Weiwei1,3, FANG Jianguang2,4
1 Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research;Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China;
4 Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
In recent years, extreme heat events have occurred worldwide and the ocean temperature has been rising, causing stress on the photosynthesis and growth of seagrass. Metabolomics enables detection of metabolic changes under environmental stress. In this study, the photosynthetic physiology and metabolic changes of the eelgrass Zostera marina L. in response to 48 h exposure to 32℃ were investigated. The results showed that high temperature induced significant inhibition of photosynthetic efficiency (ΔF/F'm) (23.9% lower than the control), enhanced respiration (58.3% higher), and decreased carbohydrate decomposition products and tricarboxylic acid (TCA) cycle intermediate products, indicating that the energy supply of the eelgrass may be insufficient at high temperature. In addition, high temperature decreased stearic acid and linoleic acid in eelgrass, suggesting the composition of the membrane system of eelgrass may change at high temperature and implying that high temperature may cause the membrane system to be unstable.
Key words:    high temperature|eelgrass|photosynthetic response|metabolome   
Received: 2017-11-07   Revised: 2018-01-04
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