海洋科学2023，Vol.47Issue(11)：110-120,11.DOI:10.11759/hykx20220706001
海洋聚球藻对不同硝酸盐浓度的响应特征
Response characteristics of marine Synechococcus under dif-ferent nitrate concentrations
摘要
Abstract
With the increase of land-source pollution input and promotion of offshore environmental restoration in recent years,nutrient levels have changed dramatically around the continental shelf of China,causing changes in the country's phytoplankton biomass and community structure.Synechococcus,a widely distributed and abundant microcyanobacteria,plays an important role in offshore ecosystems in China.However,its response to different nitrate concentrations remains unclear.In this study,the enriched samples of Synechococcus collected from the Bohai Sea and the Yellow Sea were used as experimental materials for the semi-continuous culture under different nitrate concentrations.The response characteristics of the Synechococcus were demonstrated from the growth curve,pigment contents,photosynthetic physiological parameters,carbon,and nitrogen concentrations.Under nitrate concentrations of 0.1,1.0,and 10.0 μmol·L-1,Synechococcus exhibited lower biomass and inefficient light energy conversion.Under 100.0 μmol·L-1 nitrate concentrations,the growth of Synechococcus improved,the biomass supported by the culture system increased by approximately five times,and the light energy conversion efficiency reached its highest value in the culture system.Meanwhile,the light-capturing ability of unit cells was inhibited,and nitrogen and phosphorus consumption increased.This study demonstrated that marine Synechococcus could continuously grow under different nitrate concentrations.Under higher nitrate concentrations,the biomass increased considerably;however,no corresponding equivalent increase was observed in the amounts of carbon and nitrogen released into the culture medium.The results provided an experimental basis for the response of prokaryotic micro-algae to phytoplankton ecosystems under nutrient stress.关键词
海洋聚球藻/硝酸盐/生理响应/生物量/光合作用Key words
marine Synechococcus/nitrate/physiological responses/biomass/photosynthesis分类
海洋科学引用本文复制引用
石凤,周玉婷,李佳霖,高会旺,秦松..海洋聚球藻对不同硝酸盐浓度的响应特征[J].海洋科学,2023,47(11):110-120,11.基金项目
中国科学院海洋大科学研究中心重点部署项目(COMS2020Q09) （COMS2020Q09）
国家自然科学基金(42176131)Key Deployment Project of Centre for Ocean Mega Science,Chinese Academy of Sciences,No.COMS2020Q09 （42176131）
National Natural Science Foundation of China,No.42176131 （）
