Regulation and Expression of Genes Encoding the Type III Secretion System in Xanthomonas oryzae pv. oryzae

doi:10.13560/j.cnki.biotech.bull.1985.2017-1011

Abstract

Abstract: The type III secretion system（T3SS）plays a crucial role in the virulence of plant pathogenic bacteria and their interactions with hosts. The hrp genes of Xanthomonas oryzae pv. oryzae（Xoo）are involved in the construction of T3SS,through which dozens of virulence-related proteins,called toxic effectors,are directly secreted into rice cells to suppress and disturb plant immune systems,or to induce plant-susceptible genes,thus successfully infecting plants. The expression of hrp genes is strictly regulated and induced only in certain nutrient-poor media of simulating rice inner environment. Two proteins,HrpG and HrpX,are known as key regulators for hrp and effector gene expression. Besides,many regulators are also involved in this regulation process,including two-component system（TCS）,transcriptional regulators,DNA/RNA binding proteins,carbohydrate metabolisms and c-di-GMP related proteins. In this review,we summarized the regulatory network and virulence mechanisms of T3SS in Xoo,in order to provide novel insights into the effective and sustainable disease control of bacterial blight of rice.

Key words: Xanthomonas oryzae pv. oryzae, type III secretion system, gene expression, regulatory network

FAN Su-su, TIAN Fang, HE Chen-yang. Regulation and Expression of Genes Encoding the Type III Secretion System in Xanthomonas oryzae pv. oryzae[J]. Biotechnology Bulletin, 2018, 34(2): 38-44.

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