期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 22, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/ijms222212577
关键词
recombinase polymerase amplification (RPA); sugar beet cyst nematode; Heterodera schachtii; lateral flow dipstick (LFD); Cas12a
资金
- National Key R&D Program of China [2021YFD1400125]
- National Natural Science Foundation of China [31972247]
- Open Fund of the Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis
- Ministry of Agriculture [KFJJ202101]
- China Agriculture Research System [CARS170307]
- Science and Technology Innovation Project of the Chinese Academy of Agricultural Sciences [2060302-51]
The study developed a species-specific RPA primer for detecting H. schachtii, which showed higher sensitivity and faster results compared to traditional PCR methods. Sugar beet nematodes were successfully detected in field samples using RPA, demonstrating 100% accuracy in the existing samples.
Heterodera schachtii is a well-known cyst nematode that causes serious economic losses in sugar beet production every year. Rapid and visual detection of H. schachtii is essential for more effective prevention and control. In this study, a species-specific recombinase polymerase amplification (RPA) primer was designed from a specific H. schachtii sequence-characterized amplified region (SCAR) marker. A band was obtained in reactions with DNA from H. schachtii, but absent from nontarget cyst nematodes. The RPA results could be observed by the naked eye, using a lateral flow dipstick (LFD). Moreover, we combined CRISPR technology with RPA to identify positive samples by fluorescence detection. Sensitivity analysis indicated that 10(-4) single cysts and single females, 4(-3) single second-stage juveniles, and a 0.001 ng genomic DNA template could be detected. The sensitivity of the RPA method for H. schachtii detection is not only higher than that of PCR and qPCR, but can also provide results in < 1 h. Consequently, the RPA assay is a practical and useful diagnostic tool for early diagnosis of plant tissues infested by H. schachtii. Sugar beet nematodes were successfully detected in seven of 15 field sugar beet root samples using the RPA assay. These results were consistent with those achieved by conventional PCR, indicating 100% accuracy of the RPA assay in field samples. The RPA assay developed in the present study has the potential for use in the direct detection of H. schachtii infestation in the field.
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