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Mar Environ Res

Title:		Inhibitory effects of Prorocentrum donghaiense allelochemicals on Sargassum fusiformis zygotes probed by JIP-test based on fast chlorophyll fluorescence kinetics
Author(s):		Ma Z; Wang C; Qin W; Wang M; Chen B; Jia Y; Qin Z; Dai C; Yu H; Li G; Li R; Thring RW; Zhao M;
Address:		"Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou, 325035, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China. Electronic address: mazengling@wzu.edu.cn. Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou, 325035, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China. Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China. Environmental Science and Engineering, University of Northern British Columbia, Prince George, British Columbia, V2N4Z9, Canada. Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou, 325035, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China. Electronic address: zhaomin-zmcn@tom.com"
Journal Title:		Mar Environ Res
Year:		2021
Volume:		20210820
Issue:
Page Number:		105453 -
DOI:		10.1016/j.marenvres.2021.105453
ISSN/ISBN:		1879-0291 (Electronic) 0141-1136 (Linking)
Abstract:		"The macro- and microalgae have been found to inhibit the growth and photosynthesis of one another due to allelopathic interactions between them. Sargassum fusiformis is a common and commercially cultivated seaweed in coastal waters of the East China Sea (ECS) and usually encounters dense harmful algal blooms (HABs) formed by dinoflagellates during their sexual reproduction period. In the present study, the effects of Prorocentrum donghaiense lipophilic extracted allelochemicals on the growth and photosynthesis of S. fusiformis zygotes were probed by fast chlorophyll fluorescence rise kinetics and chlorophyll a transient analysis (JIP-test). It was found that exposure to the allelochemicals led to decreased chlorophyll a content and photosynthetic rates of the zygotes in comparison to the ones in the control. In addition, using the JIP-test, it was found that the inhibitory effects of allelochemicals on photosynthesis of the zygotes were mainly exerted on the electron transport within PSII. The decrease of photosynthetic parameters such as V(J), Mo, varphi(Po), varphi(o), varphi(Eo), PI, P(TR), P(ET) in the zygotes exposed to the allelochemicals all revealed that the obstruction of electron transport, and the dominant decrease in P(ET), both implied that inhibition on the dark reaction contributed to the highest photosynthetic reduction. In addition, some reaction centers (RCs) in the zygotes exposed to the allelocamicals were inactivated, which led to higher dissipation of excitation energy, as demonstrated by the significant enhancement of the photosynthetic parameter DIo/RC. All the results indicated that the lipophilic extracts contained the allelochemicals of P. donghaiense which could inhibit the growth and photosynthesis of S. fusiformis zygotes by damaging the electron acceptors and inactivating RCs, and finally block the electron transport"
Keywords:		Chlorophyll Chlorophyll A *Dinoflagellida Fluorescence Kinetics Pheromones Photosynthesis *Sargassum Zygote Allelochemicals JIP-Test Prorocentrum donghaiense Sargassum fusiformis;
Notes:		"MedlineMa, Zengling Wang, Caixia Qin, Wenli Wang, Min Chen, Binbin Jia, Yang Qin, Zhixia Dai, Chuanjun Yu, Hengguo Li, Gang Li, Renhui Thring, Ronald W Zhao, Min eng England 2021/08/24 Mar Environ Res. 2021 Aug; 170:105453. doi: 10.1016/j.marenvres.2021.105453. Epub 2021 Aug 20"