| Xanthomonas campestris pv.Campestris(Xcc),an agricultural pathogenic microorganism,is a serious threat to the production of cruciferous crops dominated by vegetables and poses a great threat to agricultural economy.Current prevention and control measures mainly rely on the use of pesticides and antibiotics,which will cause pesticide residues and environmental pollution.Therefore,it is necessary to study and develop new environment-friendly pesticides to reduce the dosage of traditional chemical pesticides.Quorum sensing(QS)is a signaling mechanism for intercellular communication.Bacteria rely on quorum sensing to regulate intraspecific physiological responses and interspecific activities.The DSF family are cis unsaturated medium chain fatty acids.The signal molecule used in this paper is DSF,which structure is cis-11-methyl-2-dodecenoic acid.Previous studies have shown that the DSF can induce plant defense and reduce the severity of disease and the growth of pathogens in host plants,but the relevant mechanism is not clear.Therefore,in this study,we studied the effects of DSF on plant growth in Arabidopsis thaliana Col-0 and cabbage(Brassica oleracea L.).The pathogen of black rot pathogen Xcc8004 was used as indicator bacteria to investigate the effect of signal molecule DSF on inducing plant resistance to black rot.Our results indicate that the signaling molecule 2 μM DSF can significantly induce primary root elongation in Arabidopsis thaliana,which may be directly related to the change of auxin content in plants.The signal molecule DSF can induce significant and stable resistance to black rot disease in plants,and the resistance effect is related to the salicylic acid signal pathway.In this study,we elucidated the relationship between the DSF and plant growth and disease resistance,and provides research data and materials for the systematic analysis of the molecular mechanism of bacteriogenic signal mediated plant-black rot interaction. |
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