文献类型：期刊文献

英文题名：Toxicity of microplastics and nano-plastics to coral-symbiotic alga (Dinophyceae Symbiodinium): Evidence from alga physiology, ultrastructure, OJIP kinetics and multi-omics

作者：Jiang, Shiqi[1];Lu, Huiting[1];Xie, Yingyin[1];Zhou, Tingrui[1];Dai, Zhenqing[1,3];Sun, Ruikun[1,3];He, Lei[2];Li, Chengyong[1,2,3]

机构：[1]Guangdong Ocean Univ, Sch Chem & Environm, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Analyzing & Testing Ctr, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Analyt & Testing Ctr Ocean Western Guangdong Prov, Guangdong Prov Observat & Res Stn Trop Ocean Envir, Zhanjiang 524088, Peoples R China

年份：2025

卷号：273

外文期刊名：WATER RESEARCH

收录：SCI-EXPANDED(收录号：WOS:001394041000001)、、EI(收录号：20245217569026)、Scopus(收录号：2-s2.0-85212551023)、WOS

基金：This work was supported by the National Natural Science Foundation of China (22474027) , Guangdong Basic and Applied Basic Research Foundation (2022B1515020091) , Scientific Research Start-upfunds of Guangdong Ocean University (060302122402) , and the Postgraduate Education Innovation Project of Guangdong Ocean University (202241) . We would like to thank Analytical and Testing Center of Guangdong Ocean University for SEM.

语种：英文

外文关键词：Microplastics; Nano-plastics; Dinophyceae Symbiodinium; Ultrastructure; Multi-omics

外文摘要：Corals are representative of typical symbiotic organisms. The coral-algal (Symbiodinium spp.) symbiosis drives the productivity of entire coral reefs. In recent years, microplastics (MPs) and nano-plastics (NPs) have been shown to disrupt this symbiosis, leading to coral bleaching. However, how MPs/NPs affect the Symbiodinium spp. is less thoroughly explored. In this work, Dinophyceae Symbiodinium was employed as a model to study the toxicity effects of MPs and NPs with different concentrations (covering environment-related concentration) toward algae in terms of cellular responses, ultrastructure, OJIP kinetics curve and multi-omics. MPs and NPs caused adverse effects on algae growth throughout whole growing phase, with only slight differences observed in the maximal inhibition ratio. In addition to cell surface shrinkage, holes and plate sutures shedding of algae, the presence of distorted thylakoids, plasmolysis and expanded vesicle volume were observed due to the oxidative stress and physical damage caused by MPs/NPs. The results of OJIP kinetics and JIP-test revealed that MPs/NPsinduced deactivation of oxygen-releasing complex (OEC) centers, reduced electron transfer (photosystem II, PSII), and inefficient energy conversion of antenna proteins were the primary factors for photosynthesis reduction. Weighted correlation network analysis (WGCNA) showed that the impairment of photosynthesis further induces metabolic disturbances, including reactive oxygen species (ROS) generation and nucleotide metabolism dysregulation, thereby exacerbating DNA damage in the algae. Proteomics further validate the accuracy of our results and underscore the significance of the phosphatidylinositol (PI) signaling system in algae responding to MP/NPs acclimation. Collectively, our findings provide comprehensive insights into the ecotoxicity of NPs/MPs on symbiotic algae.