Molecular markers, primers and methods for estimating the length of the right end of tobacco n-introduced fragments
A technology of molecular markers and fragments, applied in the field of molecular biology, can solve problems such as lack of technical means, limitation of N gene application, unclear length of N-introduced fragments and accompanying redundant genes, etc., to reduce production, reduce burden, and reduce the range Effect
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[0058] 1. DNA extraction
[0059] Tobacco genomic DNA was extracted respectively by conventional CTAB method, the method is as follows:
[0060] (1) Weigh about 100 mg of tobacco leaf and place it in a 1.5 mL centrifuge tube, add liquid nitrogen and grind it to powder with a pestle;
[0061] (2) Add 900 μl of 2×CTAB buffer (Tris-HCl pH 7.5100mM, EDTA 20mM, NaCl 1.4M, CTAB mass percentage concentration 2%) preheated to 65°C, take it out of the water bath at 65°C for 20 minutes and cool it ;
[0062] (3) Add 200 μl of chloroform-isoamyl alcohol mixture (the volume ratio of chloroform and isoamyl alcohol is 24:1) and shake well, centrifuge at 4°C for 10 min (7200 rpm) and transfer the supernatant to a 1.5 mL EP tube;
[0063] (4) Add 200 μl of chloroform-isoamyl alcohol mixture again (the volume ratio of chloroform and isoamyl alcohol is 24:1), shake well, and centrifuge at 4°C for 10 min (7200 rpm);
[0064] (5) Take out the supernatant and put it in a new EP tube, add 3M pH5...
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