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Pathotypes of Xanthomonas axonopodis pv. dieffenbachiae Isolated from Anthurium andraeanum in China

1
State Key Laboratory of Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, College of Agriculture, South China Agricultural University, Guangzhou 510642, China
2
Guangzhou Flower Research Centre, Guangzhou 510360, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this study.
Pathogens 2018, 7(4), 85; https://doi.org/10.3390/pathogens7040085
Received: 9 September 2018 / Revised: 21 October 2018 / Accepted: 29 October 2018 / Published: 6 November 2018
(This article belongs to the Section Plant Pathogens)
Anthurium blight, caused by Xanthomonas axonopodis pv. dieffenbachiae (Xad), is one of the most serious diseases of Anthurium andraeanum. However, little is known about variations in virulence between Xad pathotypes. Here, we examined the virulence of 68 Xad 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 Xad 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 Xad population structure in China and suggest that investigation of Xad pathotypes provides useful information to guide the identification and use of resistant varieties of A. andraeanum. View Full-Text
Keywords: Anthurium andraeanum; bacterial blight; Xanthomonas axonopodis pv. dieffenbachiae; pathotype; China Anthurium andraeanum; bacterial blight; Xanthomonas axonopodis pv. dieffenbachiae; pathotype; China
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Li, S.-C.; Zeng, W.-D.; Li, X.-W.; Zhou, X.-Y.; Liu, Q.-G. Pathotypes of Xanthomonas axonopodis pv. dieffenbachiae Isolated from Anthurium andraeanum in China. Pathogens 2018, 7, 85.

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