摘要
Horizontal gene transfer(HGT)has been proved a major driving force in prokaryotic evolution.However,the molecular functions of these transferred genes in pathogenic bacteria especially plant pathogenic bacteria are still not fully investigated.In this study,the whole-genome in silico analysis was performed and found a syringopeptin synthetase(syp)homolog in Burkholderia glumae,which can cause bacterial panicle blight in rice,was predicted to be horizontally transferred from Pseudomonas ancestor with solid confidence by phylogenetic analysis.The comprehensive molecular experiments were performed to study the potential role of this gene in B.glumae.Inoculation of rice panicles with the syp mutant resulted in 60%lower disease index compared with the wild type(WT)parent strain,suggesting the requirement of syp for the full virulence of B.glumae.Chromatography analysis of exudates from B.glumae showed suppression of synthesis of metabolites analogous to syringopeptin in the mutants.All these data raise the possibility of HGT phenomenon in shaping the virulence and adaptation of B.glumae over evolutionary time.
基金
the National Key R&D Program of China(2018YFD0201202 and 2017YFD0201108)
the Agri-X Interdisciplinary Fund of Shanghai Jiao Tong University,China(Agri-X2017010)
the State Key Laboratory for Biology of Plant Diseases and Insect Pests of Shanghai Jiao Tong University(SKLOF201802)
the Shanghai Committee of Science and Technology(19390743300)
the National Natural Science Foundation of China(31200003 and 31770772)
Joint Research Funds for Translational Medicine at Shanghai Jiao Tong University(ZH2018ZDA06).
