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The SlHY5-SlbZIP17/SlMYC2-SlβCA3 Module Regulates Tomato Defence Against Pst DC3000 Under Low Light Stress.

Yue Wang1,2, Chunxin Liu1,2, He Zhang1,2

  • 1College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, China.

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Low light stress worsens bacterial diseases in tomatoes. SlbZIP17 protein helps plants fight Pseudomonas syringae pv. tomato DC3000 by boosting defense genes, but low light reduces its effectiveness.

Keywords:
Pst DC3000SlHY5SlMYC2SlbZIP17low light stress

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Area of Science:

  • Plant pathology
  • Molecular biology
  • Agricultural science

Background:

  • Low light stress exacerbates plant bacterial diseases.
  • The role of the basic leucine zipper (bZIP) family in regulating stress and pathogen responses is not fully understood.

Purpose of the Study:

  • To investigate the role of SlbZIP17 in tomato's response to low light stress and Pseudomonas syringae pv. tomato DC3000 (Pst DC3000) infection.
  • To elucidate the transcriptional regulatory network involved in this interaction.

Main Methods:

  • Gene expression analysis
  • Protein-protein interaction studies (heterodimerization)
  • Analysis of disease symptoms and reactive oxygen species (ROS) scavenging ability.

Main Results:

  • SlbZIP17 exhibits a dual response to Pst DC3000 and low light.
  • SlbZIP17 reduces disease severity by activating SlβCA3 and enhancing ROS scavenging.
  • SlbZIP17 heterodimerizes with SlMYC2 to synergistically activate SlβCA3.
  • Low light inhibits SlHY5, reducing SlbZIP17 and SlβCA3 expression, thus increasing disease susceptibility.

Conclusions:

  • SlbZIP17 is a key regulator in the synergistic network of low light stress and Pst DC3000 infection.
  • Understanding this mechanism provides targets for improving tomato resistance in controlled environments.