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Using the rDNA Internal Transcribed Spacer 1 to Identify the Invasive Pest Rhagoletis cerasi (Diptera: Tephritidae) in North America
Journal of Economic Entomology ( IF 2.2 ) Pub Date : 2020-12-25 , DOI: 10.1093/jee/toaa281
Norman B Barr 1 , Daniel Garza 1 , Lisa A Ledezma 1 , David A Salinas 1, 2
Affiliation  

The cherry-infesting fruit fly Rhagoletis cerasi Loew is a significant commercial pest in Europe that has recently invaded North America. To date, it has been trapped only in Canada and northwestern counties of New York. It has the potential to spread further and threaten production and movement of cherry commodities. Timely diagnosis of the pest will facilitate surveys and quick response to new detections. Adult morphology of the pest is distinct from other flies in North America. However, when flies are significantly damaged on traps or the immature life stages are found in fruits, molecular methods of identification are important to confirm presence and host-use records. Other than DNA sequencing of genes from flies which takes over a day to complete, there are no timely methods of molecular identification for this pest. In this study, we report the first sequence record of the internal transcribed spacer 1 (ITS1) from R. cerasi and develop two diagnostic tests for the pest based on ITS1 differences among species in North America. The tests use loop-mediated isothermal amplification (LAMP) and multiplex, conventional polymerase chain reaction (mcPCR) technologies that target the same region of the R. cerasi ITS1 sequence. Both tests performed well when tested against collections of R. cerasi from North America and Europe, generating Diagnostic Sensitivity estimates of 98.4-99.5%. Likewise, the tests had relatively high estimates of Diagnostic Specificity (97.8-100%) when tested against Rhagoletis Loew species present in North America that also use cherry as a developmental host.

中文翻译:

使用 rDNA 内部转录间隔区 1 识别北美入侵性害虫 Rhagoletis cerasi(双翅目:实蝇科)

感染樱桃的果蝇 Rhagoletis cerasi Loew 是欧洲一种重要的商业害虫,最近入侵了北美。迄今为止,它仅被困在加拿大和纽约西北部县。它有可能进一步传播并威胁樱桃商品的生产和流通。及时诊断有害生物将有助于调查和对新发现的快速反应。这种害虫的成虫形态与北美的其他苍蝇不同。然而,当果蝇在诱捕器上受到严重破坏或在果实中发现未成熟的生命阶段时,分子鉴定方法对于确认存在和宿主使用记录很重要。除了需要一天时间完成的苍蝇基因 DNA 测序外,还没有及时的分子鉴定方法来识别这种害虫。在这项研究中,我们报告了来自 R. cerasi 的内部转录间隔区 1 (ITS1) 的第一个序列记录,并根据北美物种之间的 ITS1 差异开发了两种害虫诊断测试。这些测试使用环介导的等温扩增 (LAMP) 和多重常规聚合酶链反应 (mcPCR) 技术,这些技术针对 R. cerasi ITS1 序列的相同区域。当针对来自北美和欧洲的 R. cerasi 集合进行测试时,这两种测试都表现良好,产生了 98.4-99.5% 的诊断灵敏度估计值。同样,当针对北美存在的也使用樱桃作为发育宿主的 Rhagoletis Loew 物种进行测试时,这些测试对诊断特异性 (97.8-100%) 的估计值相对较高。cerasi 并根据北美物种之间的 ITS1 差异开发两种害虫诊断测试。这些测试使用环介导的等温扩增 (LAMP) 和多重常规聚合酶链反应 (mcPCR) 技术,这些技术针对 R. cerasi ITS1 序列的同一区域。当针对来自北美和欧洲的 R. cerasi 集合进行测试时,这两种测试都表现良好,产生了 98.4-99.5% 的诊断灵敏度估计值。同样,当针对北美存在的也使用樱桃作为发育宿主的 Rhagoletis Loew 物种进行测试时,这些测试对诊断特异性 (97.8-100%) 的估计值相对较高。cerasi 并根据北美物种之间的 ITS1 差异开发两种害虫诊断测试。这些测试使用环介导的等温扩增 (LAMP) 和多重常规聚合酶链反应 (mcPCR) 技术,这些技术针对 R. cerasi ITS1 序列的相同区域。当针对来自北美和欧洲的 R. cerasi 集合进行测试时,这两种测试都表现良好,产生了 98.4-99.5% 的诊断灵敏度估计值。同样,当针对北美存在的也使用樱桃作为发育宿主的 Rhagoletis Loew 物种进行测试时,这些测试对诊断特异性 (97.8-100%) 的估计值相对较高。传统的聚合酶链反应 (mcPCR) 技术,靶向 R. cerasi ITS1 序列的相同区域。当针对来自北美和欧洲的 R. cerasi 集合进行测试时,这两种测试都表现良好,产生了 98.4-99.5% 的诊断灵敏度估计值。同样,当针对北美存在的也使用樱桃作为发育宿主的 Rhagoletis Loew 物种进行测试时,这些测试对诊断特异性 (97.8-100%) 的估计值相对较高。传统的聚合酶链反应 (mcPCR) 技术,靶向 R. cerasi ITS1 序列的相同区域。当针对来自北美和欧洲的 R. cerasi 集合进行测试时,这两种测试都表现良好,产生了 98.4-99.5% 的诊断灵敏度估计值。同样,当针对北美存在的也使用樱桃作为发育宿主的 Rhagoletis Loew 物种进行测试时,这些测试对诊断特异性 (97.8-100%) 的估计值相对较高。
更新日期:2020-12-25
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