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Jasmonates regulate apical hook development by repressing brassinosteroid biosynthesis and signaling.

Jingjie Zhang1,2, Weiyue Chen1, Xiaopeng Li1

  • 1Guangdong Provincial Key Laboratory of Plant Adaptation and Molecular Design, School of Life Sciences, Guangzhou University, Guangzhou 510006, China.

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|July 19, 2023
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This summary is machine-generated.

Jasmonates (JAs) repress brassinosteroids (BRs) to control apical hook formation in Arabidopsis. JAs inhibit BR signaling by preventing transcription factor BZR1 activation, crucial for plant development.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • The apical hook is vital for protecting the shoot apical meristem during germination.
  • Brassinosteroids (BRs) and jasmonates (JAs) are key phytohormones regulating apical hook formation antagonistically.
  • The precise interplay between BRs and JAs in this process remains unclear.

Purpose of the Study:

  • To elucidate the interrelationship between brassinosteroids (BRs) and jasmonates (JAs) in apical hook development.
  • To investigate how JAs influence BR signaling pathways during skotomorphogenesis.

Main Methods:

  • Arabidopsis thaliana as the model organism.
  • Exogenous application of methyl jasmonate (MeJA).
  • Analysis of gene expression (e.g., DWF4) and protein interactions (e.g., MYC2-BZR1).

Main Results:

  • Jasmonates (JAs) repress BR biosynthesis by inhibiting the DWARF4 (DWF4) gene expression via MYC2, MYC3, and MYC4 transcription factors.
  • MYC2 directly interacts with BR-activated transcription factor BRASSINAZOLE RESISTANT 1 (BZR1).
  • This interaction disrupts BZR1's association with PIF transcription factors, downregulating target genes like WAG2, essential for hook development.

Conclusions:

  • Jasmonates (JAs) negatively regulate brassinosteroid (BR) signaling during apical hook development.
  • JAs attenuate BR signaling by inhibiting BZR1 transcriptional activity through MYC2.
  • This study reveals a novel mechanism of hormonal crosstalk in plant development.