The impact of acute benzo(a)pyrene on antioxidant enzyme and stress-related genes in tropical stony corals (Acropora spp.).
The impact of acute benzo(a)pyrene on antioxidant enzyme and stress-related genes in tropical stony corals (Acropora spp.).
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DOI：
10.1016/j.scitotenv.2019.07.280
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
Nan Xiang;Chunxia Jiang;Wei Huang;I. Nordhaus;Hailong Zhou;Marco Drews;X. Diao
中科院分区：
文献类型：
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作者：
Nan Xiang;Chunxia Jiang;Wei Huang;I. Nordhaus;Hailong Zhou;Marco Drews;X. Diao
珊瑚礁在全球热带和亚热带沃茨具有极高的生态价值。然而，它们受到了近几十年来最广泛和最持久的破坏。多环芳烃（PAHs）是一种普遍存在的有害污染物，在海洋环境中具有很强的抗降解性。在这些化合物中，苯并（a）芘（BaP）由于水排放、石油泄漏和沿海旅游业对珊瑚造成了压力。本研究对两种顶孔菌的生理响应、氧化应激及应激相关基因表达进行了研究。（鹿角珊瑚Acropora formosa和鹿角珊瑚Acropora nasuta）进行了分析。这两种珊瑚分别暴露于10和40 μg·L-1BaP 24和72 h。结果表明：（1）BaP暴露72 h后，顶孔藻叶绿素含量显著下降，影响了共生体中虫黄藻的健康。在此期间(2)10 μg·L-1BaP处理24 h后，顶孔藻细胞出现严重的氧化损伤，超氧化物歧化酶（SOD）活性在A.福尔摩沙A.纳苏塔。(3)P-gp基因在A.福尔摩沙，而Hsp 70基因在A.纳苏塔。（4）A.台湾珊瑚礁对有机污染物的抵抗能力较低。总的来说，需要进一步的生态毒理学研究，以调查化学污染物对珊瑚的影响，并比较其不同的反应机制。
Coral reefs have extremely high ecological value in tropical and subtropical waters worldwide. However, they have been subjected to the most extensive and prolonged damage in recent decades. Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous hazardous pollutants and are highly resistant to degradation in marine environments. Among these compounds, benzo(a)pyrene (BaP) has exerted pressure on corals due to water discharges, oil spills and coastal tourism. In the present study, the physiological response, oxidative stress and stress-related genetic expressions of twoAcroporaspp. (Acropora formosaandAcropora nasuta) were analysed. These two coral species were exposed to 10 and 40 μg·L−1BaP for 24 hand 72 h, respectively. The results show that (1) BaP affects the health of the zooxanthellae in coral symbiosis after BaP exposure for 72 h due to a significant decline in chlorophyllaconcentrations inAcroporaspp. during this period. (2) An exposure of 10 μg·L−1BaP for 24 h induced serious oxidative damage toAcroporaspp., with a significant decline and increase in superoxide dismutase (SOD) activities inA. formosaandA. nasuta. (3) The P-gp gene is more sensitive inA. formosa, while the Hsp70 gene is more sensitive inA. nasuta. (4)A. formosashowed a lower ability to resist organic pollutants in coral reefs. Overall, further ecotoxicological studies are needed to investigate the impact of chemical pollutants on corals and to compare their different response mechanisms.