CN110484634A - 基于普通pcr技术的木毒蛾快速鉴定引物及其应用、鉴定方法 - Google Patents
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Abstract
基于普通PCR技术的木毒蛾快速鉴定引物及其应用、鉴定方法,属于林业和植物检疫技术领域。该木毒蛾快速鉴定引物包括上游引物LX‑F和下游引物LX‑R,所述上游引物LX‑F核苷酸序列如SEQ ID NO.1所示,所述下游引物LX‑R核苷酸序列如SEQ ID NO.2所示。本发明利用普通PCR技术,基于木毒蛾线粒体COI基因设计特异性引物,可快速实现木毒蛾卵、幼虫和虫体不完整情况下的鉴定,可以准确与毒蛾属其他昆虫卵块、幼虫等的区分,避免形态鉴定可能产生的混淆。
Description
技术领域
本发明属于林业和植物检疫技术领域,具体涉及基于普通PCR技术的木毒蛾快速鉴定引物及其应用、鉴定方法。
背景技术
木毒蛾隶属鳞翅目Lepidoptera裳蛾科Erebidae毒蛾亚科Lymantriinae 毒蛾族Lymantriini毒蛾属Lymantria,在进出境检验检疫中非常容易与重要检疫害虫舞毒蛾混淆,毒蛾属包括多种昆虫,木毒蛾与舞毒蛾、栎毒蛾、枫毒蛾、雪松毒蛾等形态相近,尤其是幼虫形态。
现有针对木毒蛾的检验方案即运用形态学方法对木毒蛾与舞毒蛾、雪松毒蛾、栎毒蛾等近缘种进行区分。
然而,形态学鉴定方法的缺陷不仅在于对卵、幼虫和蛹等虫态的鉴定困难,对于虫体不完整的情况也无法作出快速准确的鉴定,木毒蛾与同属其他毒蛾如舞毒蛾、栎毒蛾等在外形非常相似,尤其木毒蛾作为北美地区进境检疫严密监控对象舞毒蛾的近缘种,增加了我国口岸出口船舶贸易检验检疫工作的难度,而目前尚无针对木毒蛾与毒蛾属其他昆虫的快速鉴定方法。
发明内容
针对现有技术存在的问题,本发明的目的在于设计提供一种基于普通PCR技术的木毒蛾快速鉴定引物及其应用、鉴定方法的技术方案。
所述的基于普通PCR技术的木毒蛾快速鉴定引物,其特征在于包括上游引物LX-F和下游引物LX-R,所述上游引物LX-F核苷酸序列如SEQ ID NO.1所示,所述下游引物LX-R核苷酸序列如SEQ ID NO.2所示。
所述的引物在快速鉴定木毒蛾与其近缘种中的应用。
所述的应用,其特征在于所述木毒蛾近缘种包括舞毒蛾、栎毒蛾、枫毒蛾和雪松毒蛾。
所述的基于普通PCR技术的木毒蛾快速鉴定方法,其特征在于包括以下步骤:
1)取上游引物LX-F和下游引物LX-R,分别对木毒蛾与其近缘种进行特异性PCR扩增;
2)取扩增产物进行电泳,染色,成像分析,若扩增得到424bp条带,则鉴定为木毒蛾。
所述的方法,其特征在于所述步骤1)中PCR反应体系为20μL,包括1 μL模板DNA,10μM上下游引物各0.4μL,2.5mM dNTPs1.6μL,2 μL 10 × PCR buffer,5 U/μL TaqDNApolymerase0.1 μL,13.5 μL ddH2O,PCR buffer含有Mg2 +;PCR反应条件为:94ºC预变性3min;然后进入循环,94℃变性30 s,56℃退火30 s,72℃延伸1 min,35个循环;最后72℃延伸10 min。
本发明利用普通PCR技术,基于木毒蛾线粒体COI基因设计特异性引物,可快速实现木毒蛾卵、幼虫和虫体不完整情况下的鉴定,可以准确与毒蛾属其他昆虫卵块、幼虫等的区分,避免形态鉴定可能产生的混淆。
附图说明
图1为本发明的引物LX-F/ LX-R在木毒蛾上的位置示意图;
图2为引物LX-F/ LX-R特异性扩增电泳结果示意图,图中M:分子标记DL2000;1:LD-HLJ;2:LD-JL;3:LD-SY;4:LD-HB;5:LD-NM;6:LD-LYG;7: LX;8:LM;9:LSI;10:LSU;
图3为引物LX-F/ LX-R在不同退火温度下的电泳结果示意图,图中泳道1-6退火温度分别为54℃,55℃,56℃,57℃,58℃,59℃。
具体实施方式
以下结合实施例来进一步说明本发明。
实施例1
实现对木毒蛾的快速检测,依据目前研究成果,我们选择了木毒蛾(LX)、栎毒蛾(LM)、枫毒蛾(LSI)、雪松毒蛾(LSU)以及舞毒蛾(LD)的六个地理种群,包括黑龙江(LD-HLJ)、内蒙(LD-NM)、吉林(LD-JL)、沈阳(LD-SY)、河北(LD-HB)、连云港(LD-LYG),基于线粒体COI基因设计了木毒蛾的特异性引物,可特异性扩增木毒蛾。
具体操作如下:
1.DNA提取。使用以上十种毒蛾成虫的足进行DNA提取,DNA提取采用德国QIAGEN公司的DNeasy®Tissue Kit提取试剂盒。
2. 目标序列选取。对木毒蛾的mtDNA全序列进行分析,如图1所示,选择突变率较高的基因片段作为扩增的目的片段。
3. 特异性引物设计。针对所做类群,设计上游引物为LX-F:5’-TTAGCTGGTATTTCCTCA -3’(SEQ ID NO.1所示),下游引物为LX-R:5’-CAATATCTATACCTACAGTGA-3’( SEQ ID NO.2所示)。
4. PCR实验。将以上引物LX-F/ LX-R(引物由杭州擎科生物公司合成)对木毒蛾及其近缘种进行特异性扩增。所配PCR反应体系为20μL,包括1 μL模板DNA,上下游引物各0.4μL(10 μM),1.6μL dNTPs(2.5mM),2 μL 10 × PCR buffer(含有Mg2 +),0.1 μL TaqDNApolymerase(5 U/μL),13.5 μL ddH2O。PCR反应条件为:94ºC预变性3 min;然后进入循环,94 ºC变性30 s,56ºC退火30 s,72ºC延伸1 min,35个循环;最后72ºC延伸10 min。
5.取10µL PCR产物在1.5%琼脂糖凝胶1×TAE缓冲液中电泳,核酸染料(GelRed)染色,在凝胶成像系统(Alpha Imager HP)中观察并成像分析。只有木毒蛾样品的PCR产物扩增产物得到424bp条带,其它近缘种均无条带出现,如图2所示。
6.不同退火温度的梯度PCR实验。经初步实验,引物LX-F/ LX-R在低于54℃时,木毒蛾、雪松毒蛾均出现条带,此时无特异性。电泳结果显示,引物LX-F/ LX-R 的最佳退火温度为56℃,如图3所示。
序列表
<110> 浙江省检验检疫科学技术研究院
<120> 基于普通PCR技术的木毒蛾快速鉴定引物及其应用、鉴定方法
<160> 2
<170> SIPOSequenceListing 1.0
<210> 1
<211> 18
<212> DNA
<213> 人工序列(synthetic sequence)
<400> 1
ttagctggta tttcctca 18
<210> 2
<211> 21
<212> DNA
<213> 人工序列(synthetic sequence)
<400> 2
caatatctat acctacagtg a 21
Claims (5)
1.基于普通PCR技术的木毒蛾快速鉴定引物,其特征在于包括上游引物LX-F和下游引物LX-R,所述上游引物LX-F核苷酸序列如SEQ ID NO.1所示,所述下游引物LX-R核苷酸序列如SEQ ID NO.2所示。
2.如权利要求1所述的引物在快速鉴定木毒蛾与其近缘种中的应用。
3.如权利要求2所述的应用,其特征在于所述木毒蛾近缘种包括舞毒蛾、栎毒蛾、枫毒蛾和雪松毒蛾。
4.基于普通PCR技术的木毒蛾快速鉴定方法,其特征在于包括以下步骤:
1)取上游引物LX-F和下游引物LX-R,分别对木毒蛾与其近缘种进行特异性PCR扩增;
2)取扩增产物进行电泳,染色,成像分析,若扩增得到424bp条带,则鉴定为木毒蛾。
5.如权利要求4所述的方法,其特征在于所述步骤1)中PCR反应体系为20μL,包括1 μL模板DNA,10 μM上下游引物各0.4μL,2.5mM dNTPs1.6μL,2 μL 10 × PCR buffer,5 U/μLTaqDNA polymerase0.1 μL,13.5 μL ddH2O,PCR buffer含有Mg2 +;PCR反应条件为:94ºC预变性3 min;然后进入循环,94℃变性30 s,56℃退火30 s,72℃延伸1 min,35个循环;最后72℃延伸10 min。
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CN102534025A (zh) * | 2012-02-10 | 2012-07-04 | 中华人民共和国上海出入境检验检疫局 | 亚洲型舞毒蛾的实时荧光pcr检测方法及检测用引物和探针 |
CN104450898A (zh) * | 2014-11-26 | 2015-03-25 | 江苏出入境检验检疫局动植物与食品检测中心 | 一种毒蛾属昆虫的物种鉴别方法 |
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CN104450898A (zh) * | 2014-11-26 | 2015-03-25 | 江苏出入境检验检疫局动植物与食品检测中心 | 一种毒蛾属昆虫的物种鉴别方法 |
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