珊瑚礁是海洋生态系统的重要组成部分，不同珊瑚在进化过程中表现出环境适应性，但对适应性差异的机制缺乏系统研究。由于全球气候变化和人类活动的影响导致珊瑚严重退化，目前多数研究集中在单一因子对珊瑚共生体的胁迫效应，而有关珊瑚共生微生物应答酸化-BaP复合胁迫机制的相关研究国内外鲜有报道。基于课题组前期研究基础，本项目拟以南海优势珊瑚种为研究对象，采用高通量测序分析不同生态型珊瑚共生藻和微生物群落多样性的时空分布特征，探究珊瑚共生体的环境适应性差异，为环境耐受性珊瑚的选育提供重要科学依据；并利用转录组学等技术手段，挖掘珊瑚（鹿角珊瑚属）共生微生物应答酸化-BaP复合胁迫的差异基因，筛选出敏感的微生物种群，揭示珊瑚共生微生物对酸化-BaP复合胁迫响应的分子机制。预期研究成果将填补珊瑚应对复合污染胁迫的响应机制研究空白，对阐明珊瑚对环境胁迫的耐受性具有重要科学价值，也可为制定可持续性珊瑚礁保护政策提供

Coral reefs are an important part of the marine ecosystem. Different corals show different environmental adaptability in the process of evolution, but their adaptive mechanisms were lack of systematic research. Coral reefs are severely degraded due to global climate change and human activities. Most of the researches focused on the single-factor stress effect on coral symbionts. However, the relevant researches on the mechanism of coral symbiotic microorganisms responding to the acidification-BaP complex stress mechanism are still in blank. Based on the previous research foundation and technology platform, this project intends to use the dominant coral species of the South China Sea as research materials. High-throughput sequencing will be used to analyze the temporal and spatial distribution characteristics of symbiotic algae and microbial diversity in different ecotype corals, and explore the environmental adaptability of coral symbiont. It will provide an important scientific basis for the selection and breeding of environmentally-tolerant corals. At the same time, by using techniques such as transcriptomics, differentially expressed genes in the symbiotic microorganisms of coral (Acropora) under acidification-BaP combined stress will be identified. The sensitive microbial population will be screened. It will help to reveal the molecular mechanism of coral responsing to acidified-BaP complex stress. The expected research results will fill gaps in the response mechanism of coral under pollutants stress, and have important scientific value for understanding the tolerance of coral to environmental stress, and also provide a scientific basis for formulating sustainable policies to protect coral reef.