摘要
二甲基巯基丙酸内盐(dimethylsulfoniopropionate,DMSP)是地球上重要的有机硫化合物之一,在全球硫循环和气候调节等方面发挥着重要作用。浮游植物是海洋环境中DMSP的主要生产者,而氮营养盐是影响浮游植物产生DMSP的重要因素之一。本研究以赫氏颗石藻(Emiliania huxleyi)(DMSP高产量藻)与三角褐指藻(Phaeodactylum tricornutum)(DMSP中等产量藻)为对象,通过室内培养实验,对比分析了在不同氮营养盐浓度及不同氮营养盐类型条件下,2种藻培养液中颗粒态DMSP(DMSPp)的含量及其与藻密度、单细胞DMSPp含量的关系。研究发现,不同氮营养盐浓度或氮营养盐类型对赫氏颗石藻单细胞DMSPp含量影响较小(P>0.05),培养液中的DMSPp浓度主要受藻细胞密度影响;而不同氮营养盐浓度或氮营养盐类型对三角褐指藻单细胞的DMSPp含量影响显著(P<0.05),培养液中的DMSPp浓度主要受藻的单细胞DMSPp含量影响。例如,对于三角褐指藻来说,低NO_(3)^(-)浓度(0μmol/L)培养组单细胞DMSPp平均含量是高NO_(3)^(-)浓度(1764μmol/L)培养组的11倍;在不同氮营养盐类型下,NaNO_(3)培养组中总DMSPp的平均浓度分别为NH4Cl和CH4N2O培养组的3~4倍。推测以上差异可能与DMSP在不同藻类中的生理作用存在差异有关。
Dimethylsulfoniopropionate(DMSP)is one of the most important organic sulfur compounds on Earth,and its significance in global sulfur cycling and climate regulation cannot be overlooked,as it plays an indispensable role in these processes.Phytoplankton are the major producers of DMSP in the marine environment,and nitrogen nutrients are key factors influencing the production of DMSP in phytoplankton.This study focused on two algal species,Emiliania huxleyi(a high DMSP producer)and Phaeodactylum tricornutum(a medium DMSP producer),and conducted indoor culture experiments to compare and analyze the content of particulate DMSP(DMSPp)in the algal culture media under different nitrogen nutrient concentrations and types.The study investigated the relationships between overall DMSPp content,algal density,and DMSPp content per individual algal cell.The results indicated that different nitrogen nutrient concentrations and types had a minimal impact on the content of DMSPp per individual cell in E.huxleyi(P>0.05),suggesting that the DMSPp concentration in the culture media was mostly influenced by algal cell density.Conversely,different nitrogen nutrient concentrations and types had a significant impact on the content of DMSPp per individual cell in P.tricornutum(P<0.05),indicating that the DMSPp concentration in the culture media was mainly influenced by the content of DMSPp per individual algal cell.For instance,in the case of P.tricornutum,the average DMSPp content per individual cell in the low NO_(3)^(–)concentration(0μmol/L)culture group was 11 times greater than that in the high NO3–concentration(1764μmol/L)culture group.Furthermore,under different nitrogen nutrient types,the average total DMSPp concentration in NaNO_(3)culture media was three and four times higher than that in the NH_(4)Cl and CH_(4)N_(2)O culture groups,respectively.These differences may be attributed to variations in the physiological effects of DMSP on different algal species.
作者
李凌霄
孙婧
宋若晗
崔正国
曲克明
王庆奎
周明莹
崔鸿武
胡清静
LI Lingxiao;SUN Jing;SONG Ruohan;CUI Zhengguo;QU Keming;WANG Qingkui;ZHOU Mingying;CUI Hongwu;HU Qingjing(College of Fishery,Tianjin Agricultural University,Tianjin 300392,China;Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,State Key Laboratory of Mariculture Biobreeding and Sustainable Goods,Key Laboratory of Marine Fisheries and Sustainable Development,Ministry of Agriculture and Rural Affairs,Qingdao 266071,China;Shandong Marine Resource and Environment Research Institute,Shandong Key Laboratory of Marine Ecological Restoration,Yantai 264006,China)
出处
《渔业科学进展》
CSCD
北大核心
2024年第2期96-104,共9页
Progress in Fishery Sciences
基金
国家自然科学基金青年基金(41606097)
山东省自然科学基金(ZR2022MD055)
中国水产科学研究院黄海水产研究所基本科研业务费(20603022020006,2020TD12)共同资助。
