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Wei Sheng Wu Xue Bao. 2009 Jul;49(7):874-9.

[Roles of OxyRxoo, a transcriptional regulator of Xanthomonas oryzae pv. oryzae in regulation of detoxification of hydrogen peroxide].

[Article in Chinese]

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State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China.



OxyRxoo is a homologue of OxyR from Xanthomonas oryzae pv. oryzae (Xoo), the pathogen of bacterial blight of rice. To elucidate the role of OxyRxoo in detoxification of hydrogen peroxide.


OxyRxoo was studied by gene cloning, sequencing, deletion,complement and phenotype analysis.


Compared to those of the wild-type strain PXO99(A), there was no difference in bacterial growth in vitro of delta oxyRxoo, but delta oxyRxoo is more sensitive to H2O2 with reduced catalase activity. In the presence of H2O2, the expression of catalase genes (ahpCxoo, catBxoo, katExoo and srpAxoo) was significantly down-regulated, while the expression of oxyRxoo was up-regulated in delta oxyRxoo.


OxyRxoo functions as a transcription regulator in mediating and controlling H2O2 detoxification in Xoo.

[Indexed for MEDLINE]

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