The primary application of an sxtA-based qPCR assay to detect toxic algae in sea area adjacent to the Changjiang River Estuary
GAO Yan1,2,3, YU Ren-cheng1,4, LIU Yang1,3, LIN Jia-ning1,3, ZHANG Qing-chun1,4, KONG Fan-zhou1,4, WANG Yun-feng1,4, YAN Tian1,4, ZHOU Ming-jiang1
1. Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2. China Ocean Mineral Resources Research and Development Association, Beijing 100860, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
Abstract：Paralytic shellfish toxins(PSTs), including saxitoxin(STX) and its analogues, are potent neurotoxins produced by toxic dinoflagellates and cyanobacteria. Studies recently revealed a set of genes for STX synthesis in toxic cyanobacteria and dinoflagellates, and methods have been developed to quantitatively detect some core genes specific for toxin synthesis. In this study, a qPCR assay targeted to STX-synthetic gene sxtA4 was applied to detect PST-producing algae in the sea area adjacent to the Changjiang River estuary, which is the most significant region for recurring harmful algal blooms in China.Samples of toxic algae and PSTs collected along two transects in spring 2013 were measured with this method in parallel with two Taqman-based qPCR assays for Group I and IV of Alexandrium tamarense species complex and a HPLC method for PST determination. It was found that abundance of sxtA gene has a close relationship with that of A. tamarense species complex Group IV(r2=0.52, P<0.05), suggesting that toxic A. tamarense species complex(Group IV)is the major PST producer during the sampling season in this region. However, no apparent relationship was found between PST level and the abundance of toxic algae derived from those qPCR assays. In conclusion, the sxtA-based qPCR assay has its advantages in monitoring PST-producing toxic bloom in the Changjiang River estuary, but it's not accurate enough to reflect PST level in the sea.
GAO Yan,YU Ren-cheng,LIU Yang et al. The primary application of an sxtA-based qPCR assay to detect toxic algae in sea area adjacent to the Changjiang River Estuary[J]. Marine Environmental Science, 2016, 35(2): 279-287.
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