Anthurium blight, caused by pv. (), is one of the most serious diseases of However, little is known about variations in virulence between pathotypes. Here, we examined the virulence of 68 strains isolated from 30 anthurium plants from five regions of China against five different anthurium cultivars. Seven bacterial pathotypes were identified based on disease index and incidence analyses following foliar spray or leaf-clip inoculation. The resulting disease susceptibility patterns for pathotypes I⁻VII were RRRSS, RRSRS, RSRSR, RRSSS, RSSRS, RSSSS, and SSSSS, respectively. Overall, 72% of tested strains belonged to pathotypes VI or VII and were highly virulent. A further 22.1% of strains showed medium-level virulence and were classed as pathotype III, IV, or V, while the remaining 5.9% of strains were pathotype I or II, showing low virulence. Further analysis revealed differences in the virulence of strains from the same anthurium cultivar, with variation also observed in pathovars associated with the same cultivar from different areas. Our results reveal the diversity and complexity of the population structure in China and suggest that investigation of pathotypes provides useful information to guide the identification and use of resistant varieties of .
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| http://dx.doi.org/10.3390/pathogens7040085 | DOI Listing |
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