Xanthomonas oryzae pv. oryzae chemotaxis components and chemoreceptor Mcp2 are involved in the sensing of constituents of xylem sap and contribute to the regulation of virulence-associated functions and entry into rice

Molecular Plant Pathology
Raj Kumar VermaSubhadeep Chatterjee

Abstract

The Xanthomonas group of phytopathogens causes several economically important diseases in crops. In the bacterial pathogen of rice, Xanthomonas oryzae pv. oryzae (Xoo), it has been proposed that chemotaxis may play a role in the entry and colonization of the pathogen inside the host. However, components of the chemotaxis system, including the chemoreceptors involved, and their role in entry and virulence, are not well defined. In this study, we show that Xoo displays a positive chemotaxis response to components of rice xylem sap-glutamine, xylose and methionine. In order to understand the role of chemotaxis components involved in the promotion of chemotaxis, entry and virulence, we performed detailed deletion mutant analysis. Analysis of mutants defective in chemotaxis components, flagellar biogenesis, expression analysis and assays of virulence-associated functions indicated that chemotaxis-mediated signalling in Xoo is involved in the regulation of several virulence-associated functions, such as motility, attachment and iron homeostasis. The ∆cheY1 mutant of Xoo exhibited a reduced expression of genes involved in motility, adhesins, and iron uptake and metabolism. We show that the expression of Xoo chemotaxis and motility com...Continue Reading

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Citations

May 19, 2019·Annual Review of Phytopathology·Aude CeruttiLaurent D Noël
Oct 9, 2020·Molecular Plant Pathology·Saray Santamaría-HernandoEmilia López-Solanilla
Sep 22, 2021·MSystems·Claudia Sanchis-LópezJosé J Rodríguez-Herva
Jul 23, 2021·Phytopathology·Sheo Shankar Pandey, Subhadeep Chatterjee

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