J Integr Plant Biol. ›› 2020, Vol. 62 ›› Issue (10): 1552-1573.DOI: 10.1111/jipb.12922

• Plant-biotic Interactions • Previous Articles     Next Articles

A bHLH transcription activator regulates defense signaling by nucleo‐cytosolic trafficking in rice

Fanwei Meng1,2,†, Chao Yang1,2,†, Jidong Cao1, Huan Chen3, Jinhuan Pang1, Qiqi Zhao1,4, Zongyi Wang5, Zheng Qing Fu3 and Jun Liu1,2*   

  1. 1State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
    2CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China
    3Department of Biological Science, University of South Carolina, Columbia, SC 29028, USA
    4School of Life Sciences, University of Inner Mongolia, Hohhot 010021, China
    5Beijing Key Laboratory of Agricultural Product Detection and Control for Spoilage Organisms and Pesticides, Beijing University of Agriculture, Beijing 102206, China

    These authors contributed equally to this work.
    *Correspondence:
    Email: Jun Liu (Junliu@im.ac.cn)
  • Received:2019-01-20 Accepted:2020-02-26 Online:2020-03-04 Published:2020-10-01

Abstract:

Crosstalk between plant hormone signaling pathways is vital for controlling the immune response during pathogen invasion. Salicylic acid (SA) and jasmonic acid (JA) often play important but antagonistic roles in the immune responses of higher plants. Here, we identify a basic helix‐loop‐helix transcription activator, OsbHLH6, which confers disease resistance in rice by regulating SA and JA signaling via nucleo‐cytosolic trafficking in rice (Oryza sativa). OsbHLH6 expression was upregulated during Magnaporthe oryzae infection. Transgenic rice plants overexpressing OsbHLH6 display increased JA responsive gene expression and enhanced disease susceptibility to the pathogen. Nucleus‐localized OsbHLH6 activates JA signaling and suppresses SA signaling; however, the SA regulator OsNPR1 (Nonexpressor of PR genes 1) sequesters OsbHLH6 in the cytosol to alleviate its effect. Our data suggest that OsbHLH6 controls disease resistance by dynamically regulating SA and JA signaling.

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