Expression vector construction method and kit of citrus tristeza virus
A technology of decay virus and expression vector, which is applied in the field of virus expression vector construction, citrus decay virus expression vector construction method and kit field, and can solve problems such as insufficient research on expression vector
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Embodiment 1
[0074] Example 1. Identification, isolation and preservation of citrus recession virus isolate FS-577
[0075] (1) Identification and isolation of citrus decay virus
[0076] Mature shoots with leaves were collected from four different directions of the plants in the field. The method of direct tissue spot immunization is used for detection, and the specific operation is as follows: use a razor blade to cross-cut the stem or petiole of the sample, and then press it evenly on the nitrocellulose membrane, set positive and negative controls, and dry at room temperature for more than 15 minutes . Place the blotted membrane in 0.02M pH7.2 phosphate buffer containing 1%BSA (0.13M NaCl, 0.02M Na 2 HPO 4 12H 2 O, 14mM KH 2 PO 4 , 20mM KCl, 20mM NaN 3 ) was directly added to 1000:1 (v / v) alkaline phosphatase (Ap)-labeled CTV-specific antibody IgG (BioRad, USA) after blocking for 1 h, and the reaction was shaken at room temperature for 2 h. Pour off the buffer containing Ap-IgG,...
Embodiment 2
[0081] Embodiment 2. A method for constructing a full-length invasive clone of citrus decay virus, according to the following steps:
[0082] (1) Total RNA extraction: Trizol kit (Invitrogen, USA) was used to extract the total RNA of citrus recession virus isolate FS-577 in the diseased plants. For the extraction method, refer to the operation manual of the Trizol kit, and details will not be repeated here.
[0083] (2) Synthesis of first-strand cDNA: 8 μL of extracted total RNA was mixed with 1 μL of 50 ng / μL random primer (Promega, USA), 1 μL of 10 mM dNTP, reacted at 65°C for 5 min, and placed on ice for 1 min. Subsequently, 10 μL of 10× reverse transcription buffer (100 mM pH9.0 Tris-HCl, 500 mM KCl, 1% Triton X-100, 10 mM MgCl2, 0.02 M DTT), 4 U RNaseOUT (Invitrogen, USA), 2 U SuperScript was added to the reaction solution. III RT (Invitrogen, USA). After mixing, react at 25°C for 10 minutes, at 50°C for 50 minutes, and at 85°C for 5 minutes. Then place it on ice for a...
Embodiment 3
[0120] Embodiment three, a kind of citrus decay virus expression vector construction method, operate according to the following steps:
[0121] (1) Identification and acquisition of citrus decay virus.
[0122] Plants infected with citrus recession virus were selected in the field according to the direct tissue point immunization method in Example 1.
[0123] (2) Total RNA extraction. Using Trizol kit (Invitrogen, USA) to extract the direct tissue point immunoassay to determine the total RNA infected with citrus recession virus strains. For the extraction method, refer to the operation manual of the Trizol kit, and details will not be repeated here.
[0124] (3) Amplification of the promoter, fragment 1 and fragment 2. Melt 8 μL of extracted total RNA at 95°C for 2 min, and mix with 190 μL of 2×one-step buffer (200 mM pH8.8 Tris-HCl, 100 mM (NH4) 2 SO 4 , 100mM KCl, 20mM MgSO 4 , 1% Triton X-100, 10mM dNTP, 0.02MDTT), 10μM forward and reverse primers (primers ZYC357 / ZYC3...
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