Activation of PhoBR under phosphate-rich conditions reduces the virulence of Xanthomonas oryzae pv. oryzae.

Abstract:

:The two-component signal transduction system PhoBR regulates the adaptation to phosphate limitation and the virulence of many animal bacterial pathogens. However, PhoBR in phytopathogens has rarely been investigated. In this study, we found that PhoBR in Xanthomonas oryzae pv. oryzae (Xoo), the pathogen of rice bacterial leaf blight, also regulates the adaptation to phosphate starvation. Unexpectedly, rice leaves infected by the phoBR-deleted mutant and wild-type PXO99A showed similar lesions, indicating that PhoBR is unnecessary for the virulence of Xoo. phoBR was found to be silenced during host infection, whereas artificially constitutive PhoBR expression attenuated virulence on host rice and growth in phosphate-rich media. RNA-sequencing (RNA-seq) was then performed to investigate the global effect caused by constitutive PhoBR activation. RNA-seq and further experiments revealed that the PhoBR regulon in Xoo comprised a wide range of genes. Nutrient transport and metabolism readjustments that resulted from PhoBR regulon activation may be responsible for growth attenuation. Our findings suggest that growth reduction regulated by PhoBR is a fitness cost of adaptation to phosphate starvation. PhoBR in Xoo is activated under phosphate-limited conditions, which could exist in epiphytic and saprophytic surviving phases, and is strictly repressed within phosphate-rich host plants to minimize fitness costs.

journal_name

Mol Plant Pathol

authors

Zheng D,Xue B,Shao Y,Yu H,Yao X,Ruan L

doi

10.1111/mpp.12680

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

2066-2076

issue

9

eissn

1464-6722

issn

1364-3703

journal_volume

19

pub_type

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