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OsPHR2 modulates phosphate starvation-induced jasmonic acid response and resistance to Xanthomonas oryzae pv. oryzae
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  • Yaze Kong,
  • Gang Wang,
  • Xian Chen,
  • Linying li,
  • Xueying Zhang,
  • Sangtian Chen,
  • Yuqing He,
  • Gaojie Hong
Yaze Kong
Zhejiang Academy of Agricultural Sciences
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Gang Wang
Zhejiang Academy of Agricultural Sciences
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Xian Chen
Jiangsu Academy of Agricultural Sciences
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Linying li
Zhejiang Academy of Agricultural Sciences
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Xueying Zhang
Zhejiang Academy of Agricultural Sciences
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Sangtian Chen
Zhejiang Academy of Agricultural Sciences
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Yuqing He
Zhejiang Academy of Agricultural Sciences
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Gaojie Hong
Zhejiang Academy of Agricultural Sciences
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Abstract

Phosphate (Pi) and jasmonic acid (JA) play critical roles in plant growth and development. In particular, crosstalk between JA and Pi starvation signaling has been reported to mediate insect herbivory resistance in dicot plants. However, its roles and mechanism in monocot-bacterial defense systems remain obscure. Here, we report that Pi starvation in rice activates the JA signaling and enhances resistance to Xanthomonas oryzae pv. oryzae (Xoo) infection. The direct regulation of OsPHR2 on the OsMYC2 promoter was confirmed by yeast one-hybrid, electrophoretic mobility shift, dual-luciferase, and chromatin immunoprecipitation assays. Molecular analyses and infection studies using OsPHR2-Ov1 and phr2 mutants further demonstrated that OsPHR2 enhances JA response and antibacterial resistance via transcriptional regulation of OsMYC2 expression, indicating a positive role of OsPHR2-OsMYC2 crosstalk in modulating the JA response and Xoo infection. Genetic analysis and infection assays using myc2 mutants revealed that Pi starvation-induced JA signaling activation and consequent Xoo resistance depends on the regulation of OsMYC2. Together, these results reveal a clear interlink between Pi starvation signaling and the JA signaling in monocot plants, and provide new insight into how plants balance growth and defense by integrating nutrient deficiency and phytohormone signaling.

Peer review status:ACCEPTED

17 Mar 2021Submitted to Plant, Cell & Environment
18 Mar 2021Submission Checks Completed
18 Mar 2021Assigned to Editor
30 Mar 2021Reviewer(s) Assigned
12 Apr 2021Review(s) Completed, Editorial Evaluation Pending
16 Apr 2021Editorial Decision: Revise Minor
19 Apr 20211st Revision Received
19 Apr 2021Submission Checks Completed
19 Apr 2021Assigned to Editor
28 Apr 2021Review(s) Completed, Editorial Evaluation Pending
28 Apr 2021Editorial Decision: Accept