PCR detection,quantitative real-time PCR(q-RTPCR),outdoor insect resistance,and disease resistance identification were carried out for the detection of genetic stability and disease resistance through generations(T2,T...PCR detection,quantitative real-time PCR(q-RTPCR),outdoor insect resistance,and disease resistance identification were carried out for the detection of genetic stability and disease resistance through generations(T2,T3,and T4)in transgenic maize germplasms(S3002 and 349)containing the bivalent genes(insect resistance gene Cry1Ab13-1 and disease resistance gene NPR1)and their corresponding wild type.Results indicated that the target genes Cry1Ab13-1 and NPR1 were successfully transferred into both germplasms through tested generations;q-PCR confirmed the expression of Cry1Ab13-1 and NPR1 genes in roots,stems,and leaves of tested maize plants.In addition,S3002 and 349 bivalent gene-transformed lines exhibited resistance to large leaf spots and corn borer in the field evaluation compared to the wild type.Our study confirmed that Cry1Ab13-1 and NPR1 bivalent genes enhanced the resistance against maize borer and large leaf spot disease and can stably inherit.These findings could be exploited for improving other cultivated maize varieties.展开更多
目的:建立一种快速、高效、可视化的细菌多黏菌素耐药基因mcr-1检测方法,为其基层检测的展开提供依据和便利。方法:利用重组酶聚合酶扩增结合胶体金侧向流试纸条技术(Recombinase polymerase amplification combined with a lateral flo...目的:建立一种快速、高效、可视化的细菌多黏菌素耐药基因mcr-1检测方法,为其基层检测的展开提供依据和便利。方法:利用重组酶聚合酶扩增结合胶体金侧向流试纸条技术(Recombinase polymerase amplification combined with a lateral flow dipstick,RPA-LFD),辅以手持式胶体金读数仪;根据mcr-1基因保守序列设计合成一对特异性RPA引物,通过对反应条件和体系的优化,以及特异性试验、灵敏度试验、模拟食样试验和实际样品试验,成功建立了可视化定量检测细菌多黏菌素耐药基因mcr-1的RPA-LFD方法。结果:在引物浓度400 nmol/L,引物比例1:1时,该方法最佳反应条件为Mg^(2+)浓度14.0 mmol/L,反应温度37℃,反应时间20 min;灵敏度好,标准曲线方程为y=0.117x+0.051,定量限为10^(1)~108 copies/μL,检出限为10^(1)copies/μL,比PCR法低一个数量级且模拟样品检出结果与PCR法一致。利用建立的RPA-LFD法对猪肉样品、鸡肉样品、生猪养殖场环境样品、肉鸡养殖场环境样品、大肠杆菌分离株和弯曲肠杆菌分离株各15份中多黏菌素耐药基因mcr-1携带情况进行分析;RPA-LFD法与常规PCR法阳性样本检出率一致,共检出9份mcr-1基因阳性样品。RPA-LFD定量分析显示,阳性样品中mcr-1基因浓度在4.5×10^(2)~8.6×10^(4)copies/μL之间。结论:本研究建立的细菌多黏菌素耐药基因mcr-1的RPA-LFD检测法特异性强、灵敏性高、操作简单,可广泛应用于基层检验。展开更多
基金supported by the National Key Research and Development Program of China(2019YFD1002603-1)。
文摘PCR detection,quantitative real-time PCR(q-RTPCR),outdoor insect resistance,and disease resistance identification were carried out for the detection of genetic stability and disease resistance through generations(T2,T3,and T4)in transgenic maize germplasms(S3002 and 349)containing the bivalent genes(insect resistance gene Cry1Ab13-1 and disease resistance gene NPR1)and their corresponding wild type.Results indicated that the target genes Cry1Ab13-1 and NPR1 were successfully transferred into both germplasms through tested generations;q-PCR confirmed the expression of Cry1Ab13-1 and NPR1 genes in roots,stems,and leaves of tested maize plants.In addition,S3002 and 349 bivalent gene-transformed lines exhibited resistance to large leaf spots and corn borer in the field evaluation compared to the wild type.Our study confirmed that Cry1Ab13-1 and NPR1 bivalent genes enhanced the resistance against maize borer and large leaf spot disease and can stably inherit.These findings could be exploited for improving other cultivated maize varieties.
