DPO-PCR primer and method for detecting coix lacryma-jobi leaf spot bacteria
A technology of DPO-PCR and Coix leaf spot bacteria, applied in biochemical equipment and methods, DNA/RNA fragments, recombinant DNA technology, etc., can solve the problems of poor specificity, long cycle time, and low sensitivity of detection methods, and achieve specificity Strong, reliable results and high sensitivity results
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Embodiment 1
[0040] Example 1: Specific amplification of DPO-PCR primers to Coix leaf spot bacteria
[0041] 1. DPO-PCR Specific Detection of Coix Leaf Spot
[0042] ①DPO-PCR reaction system 20 μL: containing 0.2 μM each of CcDPO-F and CcDPO-R, 2× Taq PCR MasterMix 10 μL, 25 ng DNA template, make up the deficiency with sterile double distilled water. The DPO-PCR reaction program was: 94°C pre-denaturation for 5 min; 94°C for 30 s, 58°C for 30 s, 72°C for 20 s, 28 cycles; 72°C for 5 min; 12°C forever.
[0043] ②Take 5 μL of the amplified product and use 2% agarose gel electrophoresis to detect it. If a single band with a size of about 200 bp appears, it is judged as positive, and if no amplified band appears, it is judged as negative.
[0044] 2. Test results
[0045] Specificity of detection: In addition to the single band of about 200 bp in the DPO-PCR product of coix leaf spot bacteria after agarose gel electrophoresis, three pathogenic strains of the same genus and nine different...
Embodiment 2
[0046] Example 2: Sensitivity detection of DPO-PCR primers to Coix leaf spot fungus
[0047] 1. DPO-PCR Sensitive Detection of Coix Leaf Spot
[0048] The extracted Coix leaf spot DNA was diluted into 50 ng / µL, 10 ng / µL, 1 ng / µL, 100 pg / µL, 10 pg / µL, and 1 pg / µL with a total of 6 different Concentration gradient.
[0049] ①DPO-PCR reaction system 20 μL: containing 0.2 μM each of CcDPO-F and CcDPO-R, 2× Taq 10 μL of PCR MasterMix, 1 μL of DNA template, make up the deficiency with sterile double distilled water. The DPO-PCR reaction program was: 94°C pre-denaturation for 5 min; 94°C for 30 s, 58°C for 30 s, 72°C for 20 s, 28 cycles; 72°C for 5 min; 12°C forever.
[0050] ②Take 5 μL of the amplified product and use 2% agarose gel electrophoresis to detect it. If a single band with a size of about 200 bp is judged as positive, if no amplified band appears, it is judged as negative.
[0051] 2. Test results: DPO-PCR sensitivity detection of Coix leaf spot fungus, a single b...
Embodiment 3
[0052] Example 3: Detection of the annealing temperature sensitivity of DPO-PCR primers to Coix leaf spot fungus
[0053] 1. DPO-PCR Annealing Temperature Sensitivity Detection of Coix Leaf Spot
[0054] ①DPO-PCR reaction system 20 μL: containing 0.2 μM each of CcDPO-F and CcDPO-R, 2× Taq PCRMaster Mix 10 μL, 25 ng DNA template, make up the deficiency with sterile double distilled water. The DPO-PCR reaction program was: 94°C pre-denaturation for 5 min; 94°C for 30 s, 45-65°C for 30 s, 72°C for 20 s, 28 cycles; 72°C for 5 min; 12°C forever, where the annealing temperature was set at 45°C, 8 different temperatures of 47°C, 49°C, 55°C, 57°C, 60°C, 63°C, 65°C.
[0055] ②Take 5 μL of the amplified product and use 2% agarose gel electrophoresis to detect it. If a single band with a size of about 200 bp appears, it is judged as positive, and if no amplified band appears, it is judged as negative.
[0056] 2. Detection results: In the DPO-PCR annealing temperature sensitivity ...
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