Different viral effectors suppress hormone-mediated antiviral immunity of rice coordinated by OsNPR1

Hehong Zhang, Fengmin Wang, Weiqi Song, Zihang Yang, Lulu Li, Qiang Ma, Xiaoxiang Tan, Zhongyan Wei, Yanjun Li, Junmin Li, Fei Yan, Jianping Chen () and Zongtao Sun ()
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Hehong Zhang: Ningbo University
Fengmin Wang: Ningbo University
Weiqi Song: Ningbo University
Zihang Yang: Ningbo University
Lulu Li: Ningbo University
Qiang Ma: Ningbo University
Xiaoxiang Tan: Ningbo University
Zhongyan Wei: Ningbo University
Yanjun Li: Ningbo University
Junmin Li: Ningbo University
Fei Yan: Ningbo University
Jianping Chen: Ningbo University
Zongtao Sun: Ningbo University

Nature Communications, 2023, vol. 14, issue 1, 1-17

Abstract: Abstract Salicylic acid (SA) and jasmonic acid (JA) are plant hormones that typically act antagonistically in dicotyledonous plants and SA and JA signaling is often manipulated by pathogens. However, in monocotyledonous plants, the detailed SA-JA interplay in response to pathogen invasion remains elusive. Here, we show that different types of viral pathogen can disrupt synergistic antiviral immunity mediated by SA and JA via OsNPR1 in the monocot rice. The P2 protein of rice stripe virus, a negative-stranded RNA virus in the genus Tenuivirus, promotes OsNPR1 degradation by enhancing the association of OsNPR1 and OsCUL3a. OsNPR1 activates JA signaling by disrupting the OsJAZ-OsMYC complex and boosting the transcriptional activation activity of OsMYC2 to cooperatively modulate rice antiviral immunity. Unrelated viral proteins from different rice viruses also interfere with the OsNPR1-mediated SA-JA interplay to facilitate viral pathogenicity, suggesting that this may be a more general strategy in monocot plants. Overall, our findings highlight that distinct viral proteins convergently obstruct JA-SA crosstalk to facilitate viral infection in monocot rice.

Date: 2023
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DOI: 10.1038/s41467-023-38805-x

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