Harmful algal bloom-forming dinofl agellate Prorocentrum donghaiense inhibits the growth and photosynthesis of seaweed Sargassum fusiformis embryos  

作　　者：Caixia WANG Min WANG Binbin CHEN Wenli QIN Lidong LIN Chuanjun DAI Hengguo YU Renhui LI Min ZHAO Zengling MA 

机构地区：[1]Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection,Wenzhou University,Wenzhou 325035,China [2]National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution,Wenzhou University,Wenzhou 325035,China [3]Dongtou Fisheries Science and Technology Research Institute,Wenzhou 325700,China

出　　处：《Journal of Oceanology and Limnology》2021年第6期2237-2251,共15页海洋湖沼学报（英文）

基　　金：Supported by the National Key R&D Program of China(No.2018YFD0901500);the National Natural Science Foundation(Nos.41876124,61871293,41706147,42007372)。

摘　　要：Harmful algal bloom(HAB)is an ecological disaster to local mariculture.At present,its impact on macrophytes has not been well studied.In this study,we cultivated sexually propagated embryos of S argassum fusiformis-an edible seaweed-in Prorocentrum donghaiense suspensions at different cell densities(0,0.50×10^(5),0.75×10^(5),1.00×10^(5),and 1.50×10^(5) cells/mL)for 10 days,during which growth and photosynthetic activities of the embryos were determined,and a monocultivation was set up for comparison.Results show that the relative growth rate and photosynthetic activities of the embryos co-cultivated with P.donghaiense were inhibited mostly and significantly in the cell densities of 0.75×10^(5),1.00×10^(5),and 1.50×10^(5) cells/mL,and the inhibitory effects increased in overall with increased cell densities.The maximum relative electron transport rates(rETR max)and apparent photosynthetic efficiency(a)of co-cultivated embryos were all significantly lower than monocultivation ones on the 10 th day.Furthermore,the photosynthetic activity detected by chlorophyll-a fluorescence transient(i.e.,OJIP),the electron transport among electron transfer accepters of PSII(photosystem II)and that from PSII to PSI(photosystem I)was restricted,which is probably responsible for the decreases of rETR max andain the co-cultivated embryos.In addition,parts of the photosynthetic reaction centers of PSII in the co-cultivated embryos were inactivated.Therefore,P.donghaiense bloom could restrain the development and photosynthetic activities of S.fusiformis embryos,reduce the seedlings stock,and eventually hinder the development of S.fusiformis production industry.

关 键 词：EMBRYO JIP-TEST PHOTOSYNTHESIS Prorocentrum donghaiense Sargassum fusiformis harmful algal bloom 

分 类 号：Q945[生物学—植物学] X55[环境科学与工程—环境工程]