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<p><i>Xanthomonas citri</i> pv. <i>viticola</i> (<i>Xcv</i>) is one of the leading foliar pathogens of grapes in India. It induces leaf blight and defoliation in the vineyard. Limited information is available regarding the factor(s) affecting the pathogenicity of <i>Xcv</i>. The aim of present study was to examine various parameters (age, pH, temperature and concentration of the inoculum) and extracellular enzyme production (amylase, cellulase, protease and lipase) on the pathogenicity of <i>Xcv</i>. The results displayed that pathogenicity increased with respect to temperature, pH and age of the inoculum and post attainment of the optimum conditions it tends to decrease gradually. It was analyzed that isolates from naturally cold habitat had exhibited no change in pathogenicity in lower temperature. Extracellular enzymes were produced by all the isolates in varied quantity. Positive correlation between extracellular enzymes and pathogenicity was observed in 73.91% of total isolates. The study provided the insights on the grape <i>Xcv</i> interaction which will be the cornerstone for deciphering the process of pathogenesis and pathogenicity.</p>

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Determination of the Factors Responsible for the Pathogenicity of Xanthomonas citri pv. viticola Causing Bacterial Leaf Spot of Grapes

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Sneha Bhosale,
  • Sujoy Saha,
  • Nayana Patil

摘要

Xanthomonas citri pv. viticola (Xcv) is one of the leading foliar pathogens of grapes in India. It induces leaf blight and defoliation in the vineyard. Limited information is available regarding the factor(s) affecting the pathogenicity of Xcv. The aim of present study was to examine various parameters (age, pH, temperature and concentration of the inoculum) and extracellular enzyme production (amylase, cellulase, protease and lipase) on the pathogenicity of Xcv. The results displayed that pathogenicity increased with respect to temperature, pH and age of the inoculum and post attainment of the optimum conditions it tends to decrease gradually. It was analyzed that isolates from naturally cold habitat had exhibited no change in pathogenicity in lower temperature. Extracellular enzymes were produced by all the isolates in varied quantity. Positive correlation between extracellular enzymes and pathogenicity was observed in 73.91% of total isolates. The study provided the insights on the grape Xcv interaction which will be the cornerstone for deciphering the process of pathogenesis and pathogenicity.