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Establishment and Application of A Loop-mediated Isothermal Amplification Assay for Rapid Detection of Phellinus noxius on Hevea brasiliensis |
DONG Wen-Min1,2,*, HE Chun-Ping2,*, WU Wei-Huai2, LIANG Yan-Qiong2, XIE Li3, LI Rui2, HUANG Xing2, ZHENG Jin-Long2, XI Jin-Gen2, LU Ying2, YI Ke-Xian1,2,** |
1 College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; 2 Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences/Key Laboratory of Integrated Pest Management on Tropical Grops, Ministry of Agriculture and Rural Affairs, China/Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Haikou 571101, China; 3 Institute of Forestry, Hainan University, Haikou 570228, China |
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Abstract Rubber tree (Hevea brasiliensis) brown root disease caused by Phellinus noxius is a root disease that seriously harms rubber. Loop-mediated isothermal amplification (LAMP) has been widely used in many fields such as plant protection because of its high specificity, high sensitivity, rapid response, and low cost. Therefore, an acturate, sensitive and rapid detection method is a powerful tool to timely effective control measures. In this study, SYBR Green Ⅰ as an indicator, a fast visual detection method of LAMP for the detection of P. noxius was established. Four primers (2 inner primers FIP/BIP, 2 outer primers F3/B3) were designed for LAMP amplification based on the ribosome transcriptional spacer sequence specific to P. noxius. The reaction conditions were optimized and the specificity and sensitivity of LAMP were assayed. The suspected brown root disease samples in the field were verified. The study determined the optimal reaction system (100 ng/μL for template in 25 μL, 0.2 μmol/L for outer primer F3/B3, 1.2 μmol/L for inner primer FIP/BIP, 1.4 mmol/L for dNTPs, and 6 mmol/L for Mg2+, betaine is 0.8 mol/L, Bst DNA polymerase is 8 U/μL and optimal reaction temperature 63 °C, reaction 1 h). Specificity assays showed that a positive color (green) was only observed in the presence of P. noxius by SYBR GreenⅠas an indicator reaction prior to amplification, however none of other pathogens changed color (still orange). The lower limit of detection of the LAMP assay was about 1 pg/μL of genomic DNA, which was 1 000 times more sensitive than PCR method. Twenty strains of suspected samples in the field were tested by the LAMP system with the pathogen detection rate was 85%, while thenormal PCR detection rate was only 70% or 75%. The LAMP detection system established in this study can be used for the rapid detection of suspected samples of root rot of rubber tree, which was of great significance for effectively controlling the spread of the disease.
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Received: 22 August 2019
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Corresponding Authors:
**, yikexian@126.com
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About author:: * The authors who contribute equally |
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