西瓜細菌性果斑病菌鞭毛基因fliS的功能分析
[Abstract]:[objective] the bacterial fruit spot of watermelon is caused by Acidovorax citrulli,Ac, which is a serious worldwide disease. The flagella of bacteria is generally considered to be the motility organ of bacteria and plays an important role in bacterial infection. It has been reported that this action can be regulated by the flagellin gene fliS. At present, the function and regulation mechanism of flagellin gene fliS in bacterial fruit spot pathogen of watermelon are not clear. The purpose of this study was to investigate the role of the gene in the biological characteristics of flagella formation and pathogenicity. [methods] A series of primers were designed based on the genomic DNA of wild type pathogenic bacteria strain 1. The upstream and downstream fragments of knockout gene fliS were amplified by PCR. The knockout vector and complementary vector were constructed by recovery, enzyme digestion, ligation and transformation. The mutant strain of fliS gene deletion and its complementary strain were constructed, and the biological characteristics of flagella such as morphology, pathogenicity, hypersensitivity, swimming, colony induction, membrane, growth rate and colony morphology were determined. The total bacterial RNA, was further extracted to correct the expression of the target gene using glutamine synthase gene glnA as the reference, and real-time fluorescence quantitative PCR (qRT-PCR) was used to compare the wild strains. Partial flagellin gene of knockout strain and complementary strain were differentially expressed between the two strains. [results] by screening the resistant gene Gm and verifying by PCR, the expression levels of fliD and fliA were different between the knockout strain and the complementary strain. The mutant strain 1-fliS with flagellin gene fliS deletion and its complementary strain 1-fliShbwere successfully constructed. The biological characteristics and flagella of the strain were observed. The flagellin gene deletion mutant strain had the ability of swimming, the ability of membrane formation was weakened, and the ability of membrane formation was basically recovered after complementation. The pathogenicity of the mutant to melon, watermelon seedling and watermelon fruit was decreased, and the pathogenicity of the mutant strain to watermelon, melon seedling and watermelon fruit was completely recovered after complementation. The results of electron microscopy showed that the flagella of the mutant strain became shorter and the length was about 1 / 3 / 1 / 4 of that of the wild strain, and the flagellum synthesis ability of the mutant was almost recovered after complementation, and the length of the flagella was about 4 / 5 of that of the wild strain. Under the optical microscope, it was observed that there was a special halo circle formed by bacterial fibrillation around the colony of wild strains on the NA plate, but the absent mutant strain could not form the halo circle on the NA plate, and the ability of halo formation was partly recovered after complementation. The growth rate of deletion mutant strain was slower than that of wild strain, but the growth rate did not recover after complementation. There was no difference in allergy and population induction between wild strain, mutant strain and complementary strain. QRT-PCR analysis showed that the expression of, flh D was significantly lower than that of wild strain after fliS gene deletion mutation, and fliE, was significantly lower than that of wild strain. The expression of fliC and flgK was significantly higher than that of wild strain, the expression of flgM and fliD was slightly increased, and the expression of fliA was almost unchanged. The expression of flhD,fliE and fliC was partially recovered in complementary strains, but the expression of flgK,flgM and fliD was not recovered, which was the same as that of mutant strains. [conclusion] flagellum gene fliS can induce flagellum formation, swimming, membrane formation and growth rate. Colony morphology, pathogenicity and so on all have the regulation function.
【作者單位】: 福建農(nóng)林大學植物保護學院;
【基金】:國家公益性行業(yè)(農(nóng)業(yè))科研專項(201003066-2) 福建省自然科學基金(2014J01084) 福建農(nóng)林大學發(fā)展基金(KF2015058);福建農(nóng)林大學科技創(chuàng)新專項基金(CXZX2016133)
【分類號】:S436.5
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