Xanthomonas oryzae pv. oryzicola (Xoc) is the causal agent of bacterial leaf streak in rice. It is known as one of the most severe seed-born bacterial diseases of rice, molecular role governing its interaction with rice is mostly still unexplored. To successfully invade rice, the survival of the Xoc is mandotarory following generating a specific response to its host's oxidative stress condition. However, the response network of Xoc is still unknown. To address this question, we performed a time-series RNA-seq analysis on the Xoc response to H2O2. Overall, our RNA sequence analysis of Xoc revealed a significant global gene expression profile when it exposed to H2O2. The response of key genes was also noted that soxR triggers and regulates the Xoc oxidative stress response in the early stage of infection, gene expression kinetics among the time-series samples, namely for TonB-dependent receptors and the suf and pst operons. Moreover, a hypothetical protein (XOC_2868) showed significant differential expression following its mutant endorsed RNA-seq findings by clearly displaying a greater H2O2 sensitivity and decreased pathogenicity than the wild-type. Gene location and phylogeny analysis strongly suggests that this gene may have been horizontally transferred from a Burkholderiaceae ancestor. Our study not only provides a first glance of Xoc's global response against oxidative stress, but it also reveals the impact of horizontal gene transfer in the evolutionary history of Xoc.
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