Biology restoration method of petroleum pollution soil by using broad-host-range self-transfer degrading plasmid
A technology for degrading plasmids and oil pollution, applied in the field of molecular biology technology and contaminated soil remediation, to achieve lasting remediation of petroleum hydrocarbon-contaminated soil with obvious effects
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Embodiment 1
[0028] 1) Host bacteria activation and expansion culture:
[0029] Take out the host bacteria carrying the broad-host self-transfer plasmid stored in the glycerol tube from the -70°C refrigerator, inoculate it on the LB solid medium containing the corresponding double selection markers (the selection marker of the host bacteria and the selection marker of the plasmid), and set the line. Incubate overnight at 30°C. Use a sterilized inoculation needle to inoculate the above-mentioned cultured colony into 5 ml of LB liquid medium without antibiotics, and cultivate overnight on a shaker at 30°C. The above-mentioned cultivated bacterial solution was inserted into 100ml LB liquid medium according to the inoculum amount of 5% volume to carry out expansion cultivation. Cultivate to the logarithmic growth phase, and the number of bacteria reaches 1.0×10 after fermentation 9 .
[0030] Wherein, the host bacteria carrying the broad host self-transfer plasmids are respectively transfer...
Embodiment 2
[0041] The surface soil of the Shenyang Ecological Station of the Chinese Academy of Sciences that was not polluted by petroleum hydrocarbons was collected, and the 0-20cm surface soil was passed through a 100-mesh sieve to measure the moisture content of the soil (to facilitate the adjustment of the soil moisture in the final follow-up experiment). The phenanthrene is dissolved in acetone and mixed into the soil at a ratio of 5mg / g dry soil, mixed evenly and the acetone is volatilized. The cultivation experiment was carried out in 1000ml jars, and 500g of phenanthrene-contaminated soil samples were placed in each jar.
[0042] Guangshu self-transferred petroleum hydrocarbon degradation plasmid pW22-3G, the size is 77kb; its genetic marker is green fluorescent protein (gfp), and the degradation genes are aromatic ring hydroxylation dioxygenase gene (phdA), benzene dioxygenase gene ( ben), xylene monooxygenase gene (touA), salicylic acid hydroxylase gene (nahG), catechol 2,3-di...
Embodiment 3
[0047] The in-situ oil-contaminated farmland surface (0-20cm) soil in the Shenfu Irrigation Area was collected and passed through a 2mm sieve. The total petroleum hydrocarbon pollution concentration was determined to be 3482mg / kg dry soil, which was severely polluted. Take 500g of contaminated soil samples and place them in a 1000ml glass jar.
[0048] Inoculate broad host self-transferred petroleum hydrocarbon degradation plasmid pS3-2G, the size is 106kb; its genetic marker is kanamycin resistance (Km R ), the degradation genes are aromatic ring hydroxylation dioxygenase gene (phdA), benzene dioxygenase gene (ben), xylene monooxygenase gene (touA), salicylic acid hydroxylase gene (nahG), Catechol 2,3-dioxygenase gene); the host bacteria is Agrobacterium tumefaciens C58, which belongs to α-Proteobacteria). The plasmid is transferred to the host strain by the conventional method of the prior art, and is ready for use.
[0049] The above-mentioned host bacterium carrying the ...
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