Detection of Phytophthora cambivora(Petri)Buisman with loop-mediated isothermal amplification (LAMP) technique based on color differentiation
A Phytophthora and blackwater technology, applied in the biological field, can solve the problems of inability to quickly detect Chestnut Phytophthora blackwater bacteria, time-consuming, laborious, poor specificity, etc., and achieve the effect of expanding the scope of use, time-consuming, and high accuracy
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Embodiment 1
[0039] Example 1: Selecting novel target genes, designing and screening LAMP primers for detecting Chestnut Phytophthora blackwater pathogen, and establishing a LAMP detection system
[0040] (1) Selection of novel target genes and design and screening of primers
[0041] The selection of new target genes and the screening of primers are the key factors for LAMP detection. At present, molecular detection is widely used based on the ribosomal transcriptional spacer (ITS) target, but because the ITS sequence does not have enough variation sites to distinguish all Phytophthora species, it is necessary to discover new molecular detection targets. First, we searched relevant literature and selected available targets such as tRNA (transfer RNA) EF1α (translation elongation factor), Ypt1 (guanosine triphosphate-binding protein gene), and beta tubulin gene. Taking the target Ypt1 as an example, download the Ypt1 gene sequence of Phytophthora chestnutii and the Ypt1 gene sequence of o...
Embodiment 2
[0053] Embodiment 2: Preparation of DNA template
[0054] The DNA extracted from the sample is used as a template for the LAMP reaction. The specific process is as follows:
[0055] (1) Bacterial strain culture and preparation of mycelium powder
[0056]The Phytophthora strains for testing are transferred to LBA (Lima bean medium (Zheng Xiaobo. Phytophthora and its research technology. China Agricultural Press. 1997)) plate, and other bacterial strains are transferred to PDA (Potato Dextrose Solid Medium (Erwin , D.C.; Ribeiro, O.K. Phytophthora lateralis. In: Phytophthora disease worldwide. American Phytopathological Society, St.Paul (US), 1996, pp 365-367)) plate, 25 ℃ dark culture for 3 days and cut 10 pieces from the edge of the colony 2× 2mm hyphae block, the bacterial strain of Phytophthora is transferred to V8 liquid medium (Zheng Xiaobo. Phytophthora and its research technology. China Agricultural Press. 1997), other bacterial strains are transferred to PDB (potato de...
Embodiment 3
[0059] Example 3: Detection of specificity and sensitivity of LAMP primers
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