Reduced salinity interacts with ultraviolet radiation to alter photosystem Ⅱ function in diatom Skeletonema costatum  

作　　者：Shasha ZANG Fang YAN Daode YU Jingjing SONG Lei WANG Zhiguang XU Hongyan WU 

机构地区：[1]College of Life Science,Ludong University,Yantai 264025,China [2]Marine Science Research Institute of Shandong Province,Qingdao 266104,China [3]Key Laboratory of Marine Biotechnology in Universities of Shandong(Ludong University),Yantai 264025,China

出　　处：《Journal of Oceanology and Limnology》2022年第4期1615-1627,共13页海洋湖沼学报（英文）

基　　金：Supported by the Shandong Provincial Natural Science Foundation(Nos.ZR2019MC015,ZR2020QC025,ZR2020MD092);the open project of Rongcheng Marine Industrial Technology Research Institute,Ludong University(No.KF20180001);the Key Technology Research and Development Program of Shandong(No.2019GSF107091)。

摘　　要：To investigate the effect of reduced salinity on diatoms’ capacity to cope with changing ultraviolet radiation(U VR) and photosynthetically active radiation(PAR),Skeletonema costatum was grown in a range of salinity(15,25,and 35).The photo system Ⅱ(PSⅡ) function was analyzed by increasing PAR and UVR to mimic a mixing event in turbulent waters.The re sults show that high UVR exposure significantly reduced PSII activity,especially in cells grown at low salinity.UVR,but not salinity,stimulated the ’removal’ rate of PSII protein PsbA.Salinity alone,in the range of 15 to 35,did not regulate PSⅡ acceptor region;however,the low salinity+UVR treatment decreased the energy flux for electron transport per PSⅡ reaction center in S.costatum.It showed that low salinity exacerbated the damaging effect of UVR on PSⅡ function in S.costatum by suppressing Psb A protein synthe sis and modifying the photochemistry of PSⅡ.Although higher catalase(CAT) activity and NPQs were induced,they were unable to prevent the combined damage effect of low salinity+UVR.Our findings indicate that reduced salinity and increased UVR potentially affect the abundance and distribution of S.costatum with the escalation of climate disturbances.

关 键 词：DIATOM ultraviolet radiation(UVR) PHOTOINACTIVATION photosystem II 

分 类 号：Q945.11[生物学—植物学]