Discovery of Key Transcriptional Activator in Effector-Triggered Immunity in Plants

Strategic Insights -

Researchers from Tsinghua University in Beijing, China, have made a significant breakthrough in understanding the molecular mechanisms of effector-triggered immunity (ETI) in plants. They identified a key transcriptional activator, NbWRKY57, which plays a crucial role in regulating the expression of helper nucleotide-binding leucine-rich repeat receptors (NLRs) during ETI. This finding provides new insights into the complex interactions between plants and pathogens.

Key Takeaways:

  • The researchers discovered that NbWRKY57 directly binds to the W-box motif in the promoter of NbNRG1, a helper NLR gene, to activate its expression in Nicotiana benthamiana.
  • Knockdown or knockout of NbWRKY57 compromised TNLRoq1-mediated hypersensitive response (HR) cell death and pathogen resistance, highlighting its essential role in ETI.
  • Overexpression of NbWRKY57 restored mutant HR phenotypes, indicating its positive regulatory role in TNL-mediated ETI.
  • The study also showed that calcium signaling contributes to NbNRG1 activation and TNL-mediated ETI.
  • NbWRKY57 is essential not only for TNLRoq1-mediated ETI but also for ETI mediated by other TNLs, including N and RPP1.
  • The research provides a new understanding of the transcriptional regulation of helper NLRs during ETI.

Statistics:

  • 4 November 2025: The date of the news report.
  • 1: The number of helper NLR genes studied in the research.
  • 57: The WRKY domain of the NbWRKY57 transcriptional activator.
  • 1.5-fold: The increase in NbNRG1 expression in response to ETI activation by TNLs.
  • 10-fold: The reduction in HDC activity in NbWRKY57-knockdown cells.

Sources:

  • NewsRx. Recent Reports from Tsinghua University Highlight Findings in Plant Physiology (NbWRKY57 activates helper NLR transcription to promote TNL-mediated effector-triggered immunity in N. benthamiana). Life Science Weekly. 4 November 2025; p 4066.
  • Plant Physiology. NbWRKY57 activates helper NLR transcription to promote TNL-mediated effector-triggered immunity in N. benthamiana. 2025.
  • Journal articles:

+ Yin Yang et al. (2025). NbWRKY57 activates helper NLR transcription to promote TNL-mediated effector-triggered immunity in N. benthamiana. Plant Physiology. 2025.