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Adaptive responses of geographically distinct strains of the benthic dinoflagellate, Prorocentrum lima (Dinophyceae), to varying light intensity and photoperiod

文献类型： 外文期刊

作者： Wu, Haiyan 1 ; Zhang, Haoyu 1 ; Peng, Jixing 1 ; Zheng, Guanchao 1 ; Lu, Songhui 2 ; Tan, Zhijun 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Key Lab Testing & Evaluat Aquat Prod Safety & Qual, Minist Agr & Rural Affairs, Qingdao 266071, Peoples R China

2.Jinan Univ, Coll Life Sci & Technol, Res Ctr Harmful Algae & Marine Biol, Guangzhou 10362, Peoples R China

3.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, State Key Lab Mariculture Biobreeding & Sustainabl, Qingdao 266071, Peoples R China

关键词： Growth; Diarrhetic shellfish toxin; Pigment; Variation; Impairment

期刊名称：HARMFUL ALGAE （ 影响因子：6.6； 五年影响因子：5.6 ）

ISSN： 1568-9883

年卷期： 2023 年 127 卷

页码：

收录情况： SCI

摘要： The toxic Prorocentrum lima complex can potentially cause serious harm to the benthos and entire food chain. Studies have revealed physiological differences in strains from different regions related to local environment, while differences in the adaptive responses of P. lima complex should be urgently assessed. Hence, this study explored the adaptive responses to varying light intensities and photoperiods of two P. lima complex strains SHG101 and 3XS34, isolated from the Bohai Sea and the South China Sea, respectively. We found the highest cell density of 7.49 x 104 cells mL-1 recorded in the 3XS strain in the stationary phase with high light intensity exposure. No significant difference was observed in growth rate among SHG groups, however, significant differences were found among 3XS groups ranging from 0.176 to 0.311 d-1. Three key pigments Chl a, Peri, and Fuco accounted for up to 60% of the total pigments. Production and concentrations of pigments and Fv/Fm values exhibit a significant negative correlation with high light intensity and growth. Conversely, total diarrhetic shellfish toxin content and the proportion of diol esters increased to varying degrees after high intensity light exposure, with 3XS strain under high light intensity and a photoperiod of light and darkness (12L:12D) consistently exhibiting the highest levels, finally reaching a maximum (21.6 pg cell-1) at day 28. A shortened photoperiod of high light intensity (8L:16D) resulted in impaired recovery compared with 12L:12D. Furthermore, 3XS showed more delayed and intense adaptive responses, indicating a stronger tolerance compared to SHG. Collectively, these results directly characterized variation in the adaptive responses of geographically distinct strains of P. lima complex, highlighting the previously ignored potential risk diversity of this species.

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