Fluorescent detection of brown spot of tobacco caused by Alternaria alternata based on lambda exonuclease-induced DNAzyme amplification

文献类型： 外文期刊

第一作者： Lian, Kai

作者： Lian, Kai;Chen, Guangyan;Li, Yusen;Xi, Dongmei;Wang, Ying;Wang, Xiaoqiang;Wang, Hui;Zhang, Wenna;Hu, Xihao

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期刊名称：RSC ADVANCES （ 影响因子：3.9； 五年影响因子：3.9 ）

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年卷期： 2023 年 13 卷 3 期

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收录情况： SCI

摘要： A rapid, simple, and sensitive fluorescent detection method for brown spot of tobacco is established by lambda exonuclease-induced Mg2+-dependent DNAzyme amplification. It contains hybridization of the Alternaria alternata genome and HP1, digestion of the 5 '-phosphorylated strand of the hybrid dsDNA by lambda exonuclease, acquisition of complete Mg2+-dependent DNAzyme, cleavage of the substrate modified with FAM and BHQ-1, and fluorescent detection. The proposed assay exhibits good sensitivity (10 pg L-1), selectivity and reproducibility. The method does not require pure DNA and expensive instruments, and can be performed within 2.5 hours. To the best of our knowledge, this is the first report of fluorescent detection of Alternaria alternata and its tobacco field samples. This method can be applied to the rapid and sensitive detection of Alternaria alternata in tobacco and its seedlings, and is particularly important for the green prevention and control of tobacco brown spot disease.

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