The relationship between PthA expression and the pathogenicity of Xanthomonas axonopodis pv. citri

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• 作者：Na Li (1)
  Long Huang (1)
  Liping Liu (1)
  Dazhi Li (1)
  Suming Dai (1)
  Ziniu Deng (1)
  
• 关键词：Citrus ; Citrus canker ; PthA ; Pathogenesis mechanism
• 刊名：Molecular Biology Reports
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：41
• 期：2
• 页码：967-975
• 全文大小：556 KB
• 作者单位：Na Li (1)
  Long Huang (1)
  Liping Liu (1)
  Dazhi Li (1)
  Suming Dai (1)
  Ziniu Deng (1)
  
  1. Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Utilization; Horticulture and Landscape College, Hunan Agricultural University, Changsha, Hunan, 410128, People’s Republic of China
  
• ISSN：1573-4978

文摘

Citrus canker disease, caused by Xanthomonas axonopodis pv. citri, affects almost all citrus species and cultivars and hascaused severe damage to the citrus industry worldwide. PthA is considered the main pathogenesis effector of the pathogen. This research aimed to temporally and spatially analyze the expression of the PthA protein of the bactrium during its culture, and then try to understand the relationship between the PthA expression levels and the pathogenicity. The relationship between the expression of PthA and the pathogenicity of X. axonopodis pv. citri was fully investigated by using SDS-PAGE, Western blot, ELISA and field inoculation, It was found that bacteria cultured for 36?h had the highest expression of PthA and showed the most virulent pathogenicity. The conservation duration of the pathogen isolates influenced their PthA expression and the pathogenicity, and negative relationship between the duration and the expression of PthA and pathogenicity. When the stored pathogen bacteria were cultured in liquid LB medium, they were able to regain activated, showing higher PthA expression level and enhanced pathogenicity, even though the activity was inferior, in terms of both PthA expression and pathogenicity, than the freshly isolated ones. Seven isolates from different citrus orchards displayed almost identical protein expression profiles. It could conclude that the expressions of PthA was positively related to pathogenicity.