1887

Abstract

Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is a serious bacterial disease in rice-growing regions worldwide. Phage therapy has been proposed as a potential measure to treat bacterial infections. In this study, a novel phage, Xoo-sp2, which infects Xoo was isolated from soil. The characteristics of Xoo-sp2, including the morphology, one-step growth curve and host range, were analysed. The genome of phage Xoo-sp2 was sequenced and annotated. The results demonstrated that Xoo-sp2 is a siphovirus and has a broad lytic spectrum, infecting 9 out of 10 representative Xoo strains. Genome analysis showed that the Xoo-sp2 genome consists of a linear double-stranded DNA molecule of length 60 370 bp. Annotation of the whole genome indicated that Xoo-sp2 encodes 79 putative open reading frames (ORFs). Comparative genomics analysis of Xoo-sp2 showed that it shares significant similarity only with Pseudomonas and Stenotrophomonas phages (with maximum identity reaching 80 % along 69 % of the genome), and thus represents a novel Xanthomonas phage. Xoo-sp2 significantly inhibited Xoo growth in liquid culture. An experiment with potted plants indicated that Xoo-sp2 could efficiently control BLB in living rice. In summary, our work characterized a novel Xanthomonas phage and demonstrated its potential as a prophylactic agent in the control of BLB in rice.

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2018-08-10
2019-12-05
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