alexa Xanthomonas oryzae pathovars: model pathogens of a model crop.
Agri and Aquaculture

Agri and Aquaculture

Rice Research: Open Access

Author(s): NioLiu DO, Ronald PC, Bogdanove AJ, NioLiu DO, Ronald PC, Bogdanove AJ, NioLiu DO, Ronald PC, Bogdanove AJ, NioLiu DO, Ronald PC, Bogdanove AJ

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Abstract SUMMARY Xanthomonas oryzae pv. oryzae and Xanthomonas oryzae pv. oryzicola cause bacterial blight and bacterial leaf streak of rice (Oryza sativa), which constrain production of this staple crop in much of Asia and parts of Africa. Tremendous progress has been made in characterizing the diseases and breeding for resistance. X. oryzae pv. oryzae causes bacterial blight by invading the vascular tissue, while X. oryzae pv. oryzicola causes bacterial leaf streak by colonizing the parenchyma. In rice there are 29 major genes for resistance to bacterial blight, but so far only a few quantitative resistance loci for bacterial leaf streak. Over 30 races of X. oryzae pv. oryzae have been reported. Both pathogens exhibit genetic variation among isolates. Mechanisms of pathogenesis and resistance have begun to be elucidated. Members of the AvrBs3/PthA family of transcription activator-like effectors play a major role in the virulence of X. oryzae pv. oryzae and possibly X. oryzae pv. oryzicola. Cloning of six rice resistance genes for bacterial blight and one from maize effective against bacterial leaf streak has uncovered a diversity of structure and function, some shared by genes involved in defence in animals. This article reviews research that spans a century. It also presents a perspective on challenges for sustainable control, and opportunities that interactions of X. oryzae pathovars with rice present as models for understanding fundamental aspects of bacterial pathogenesis of plants and plant disease resistance, as well as other aspects of plant and microbial biology, with implications also for animal innate immunity. This article was published in Mol Plant Pathol and referenced in Rice Research: Open Access

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