Multifunctional engineering strain for degrading chlorpyrifos and construction method thereof
An engineering strain, chlorpyrifos technology, applied in the field of biodegradation of chemical pesticides, can solve pollution and other problems, achieve the effect of promoting plant growth, increasing the function of reducing pesticide residues, and good repair effect
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[0044] Example 1: Construction of a multifunctional engineered strain of chlorpyrifos
[0045] 1) Construction of recombinant plasmid pUT-M
[0046] Design primers based on organophosphate degrading enzyme genes:
[0047] mf: 5’GATCGCGGCCGCAGGAGGTTGATATGCCCCTGAAGAAC-3’
[0048] mr: 5’-GATAGCGGCCGCCTTGGGGTTGACGACCG-3’
[0049] Introduce Not I restriction site and SD sequence at both ends of the gene, and use pGM-T-M as template for PCR amplification. The reaction conditions are: pre-denaturation at 94°C for 3 minutes, denaturation at 94°C for 30 minutes, annealing at 55°C for 50 minutes, extension at 72°C for 1 minute, 30 cycles in total, and finally extension at 72°C for 10 minutes.
[0050] The organophosphate degrading enzyme gene and plasmid pUT-Km1 were cut with Not I, and then ligated, transformed into E.coli S17-1 (λ-pir), and the transformants were detected by PCR using the above primers. The reaction conditions were the same as above.
[0051] Detect the positive clones by PCR, e...
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[0065] Example 2: Biological characteristics of chlorpyrifos multifunctional engineering strain P418-M
[0066] (1) Determination of the growth curve of the multifunctional engineering strain P418-M and the original strain P418
[0067] The growth rate of the two strains was measured in P418 liquid medium. The results show that( Figure 5 ), the engineered strain has a foreign gene inserted into the chromosome, but its growth curve is not significantly different from that of the original strain P418, indicating that the introduction of foreign genes only increases the function of the original strain without affecting its growth. This shows that the medium conditions of the original strain can be fully used for the cultivation of engineered strains.
[0068] (2) Comparison of the ability of dissolving phosphorus, potassium and nitrogen between the multifunctional engineering strain P418-M and the original strain P418
[0069] The following methods were used to determine the ability of...
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