Genetic fingerprinting distinguishes pathogenic variability of asiatic citrus canker pathogen, Xanthomonas citri pv. citri type A

Citrus canker, caused by Xanthomonas citri pv. citri (Xcc), is one of the most widespread citrus disease. In this study, 54 isolates of Xcc were obtained from citrus canker-infected leaves, twigs and fruit samples collected from various citrus-growing regions in Bangladesh. These isolates were analysed through pathogenicity tests and PCR amplification. The results revealed varying levels of aggressiveness among the isolates, ranging from weak to moderate and aggressive. No correlation was found between the host plants and their geographical locations. The genetic analysis of Xanthomonas isolates from around the world revealed 100 % similarity. All the Xanthomonas isolates were grouped into 2 major clusters. DNA fingerprinting showed high genetic variability, with no correlation between hosts, geographic locations or aggressiveness levels. This information on the population diversity of the citrus canker pathogen, Xanthomonas citri pv. citri (Xcc), will be valuable for developing sustainable management strategies for citrus cankers in Bangladesh and the broader Indian sub-continent region.