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Rapid and Sensitive Detection of Meloidogyne graminicola in Soil Using Conventional PCR, Loop-Mediated Isothermal Amplification, and Real-Time PCR Methods

文献类型： 外文期刊

作者： He, Qingcong 1 ; Wang, Dongwei 1 ; Tang, Bei 1 ; Wang, Jian 3 ; Zhang, Deyong 1 ; Liu, Yong 1 ; Cheng, Feixue 1 ;

作者机构： 1.Hunan Acad Agr Sci, Inst Plant Protect, Key Lab Integrated Management Pests & Dis Hort Cr, Changsha 410125, Peoples R China

2.Grad Sch Hunan Univ, Long Ping Branch, Changsha 410125, Peoples R China

3.Hunan Acad Agr Sci, Agr Econ & Reg Planning Res Inst, Changsha 410125, Peoples R China

关键词： conventional PCR; loop-mediated isothermal amplification (LAMP); Meloidogyne graminicola; real-time PCR; sensitivity; specificity

期刊名称：PLANT DISEASE （ 影响因子：4.438； 五年影响因子：4.7 ）

ISSN： 0191-2917

年卷期： 2021 年 105 卷 2 期

页码：

收录情况： SCI

摘要： Meloidogyne graminicola is one of the major plant-parasitic nematodes (PPNs) that affect rice agriculture. Rapid identification and quantification of M. graminicola in soil is crucial for early diagnosis so that measures can be taken to reduce the impact of PPN diseases and ensure food security. In this study, M. graminicola species-specific primers for conventional PCR, loop-mediated isothermal amplification (LAMP), and real-time PCR were designed based on the sequence-characterized amplified region. The primers were highly specific and sensitive, and only samples containing M. graminicola DNA showed positive results. The sensitivity of LAMP and real-time PCR (two second-stage juvenile [J2] M. graminicola in 100 g of soil) was higher than that of conventional PCR (200 J2s in 100 g of soil). A standard curve (correlation coefficient R-2 = 0.970, P < 0.001) was generated by amplifying DNA extracted from 0.5 g of soil, and a significant correlation was observed between the number of M. graminicola determined by microscopic examination and that predicted from the standard curve (R-2 = 0.477, P = 0.0160). In quantification analyses of M. graminicola isolated from 31 naturally infested soils, the sensitivity of LAMP and real-time PCR (22 M. graminicola in 100 g of soil) was higher than that of conventional PCR (211 M. graminicola in 100 g of soil). The conventional PCR, LAMP, and real-time PCR methods have the potential to provide a useful platform for rapid species identification according to the experimental conditions. The real-time PCR assay and standard curve can be used for quantification of M. graminicola. These newly developed assays will help to facilitate the control of these economically important PPNs.

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