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Specific Detection of Peronospora tabacina by PCR-amplified rDNA Sequences

机译:通过PCR扩增的rDNA序列特异性检测烟粉虱

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摘要

Peronospora tabacina Adam, a downy mildew fungus, is a devastating disease of tobacco and a pathogen of import prohibition in Taiwan. For quarantine purpose, we developed a nested PCR method to detect this pathogen. With universal primer pair ITS1/ITS4, internal transcribed spacer (ITS) region of pathogen's rDNA was amplified. Specific PCR primers (PT1/PT2) were designed based on ITS sequence and used to amplify a 493-bp rDNA fragments from P. tabacina. In order to increase the sensitivity, another primer pair (PT3/PT4) was used in a one-tube nested PCR. The expected 243-bp fragment was amplified from P. tabacina, but not from any other tested fungi or commercial tobacco leaves. The detection limit of this nested PCR could be low as 1 pg of templateDNA. The present nested PCR method showed to be rapid, simple and available as a tool to screen P. tabacina infection for quarantine purpose.
机译:霜霉菌真菌Peronospora tabacina Adam是台湾的毁灭性烟草疾病和进口禁止病原体。为了隔离,我们开发了一种巢式PCR方法来检测这种病原体。使用通用引物对ITS1 / ITS4,可扩增病原体rDNA的内部转录间隔区(ITS)。基于ITS序列设计特异性PCR引物(PT1 / PT2),并用于扩增烟草中的493 bp rDNA片段。为了提高灵敏度,在单管巢式PCR中使用了另一对引物(PT3 / PT4)。预期的243 bp片段是从烟草(P. tabacina)扩增而来的,而不是其他任何测试过的真菌或商业烟叶的扩增。此嵌套式PCR的检测限可能低至1 pg模板DNA。目前的巢式PCR方法显示出快速,简单的方法,可作为筛选用于检疫的西班牙烟草(P. tabacina)感染的工具。

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