Complete Genome Sequence of Xanthomonas citri subsp. citri CQ13, an Alternative Model Strain to Study Citrus Bacterial Canker in China

Xanthomonas citri subsp. citri is a quarantine organism causing citrus bacterial canker in many countries. Sharing research materials worldwide became difficult due to the local administrative regulation, which hindered the continuity of studies on this disease. Here, we report a complete genome sequence of X. citri subsp. citri strain CQ13 achieved by a combination of Illumina and Nanopore platforms. The CQ13 genome comprises a circular chromosome (5,142,501 bp; G+C content 64.83%) and two circular plasmids, pXAC33 and pXAC64 (34,102bp and 64,942bp; G+C content 61.96% and 61.41%, respectively). Annotation revealed 4,243 protein-coding sequences, six rRNA genes, 59 tRNA genes, 40 ncRNA genes, and 168 pseudogenes. Notably, the analyses of average nucleotide identity (ANI), host range, pathogenicity, and type III effector repertoire suggest that CQ13 is particularly close-related to the current model strain 306. Therefore, strain CQ13 may serve as an alternative model strain, and its genome sequence could provide a valuable resource for citrus canker research in China.