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Updated: Nov 11, 2025

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The SlTCP26 promoting lateral branches development in tomato.

Xiaoying Wei1, Jun Yang1, Dou Lei1

  • 1Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Science, China West Normal University, Nanchong, 637009, Sichuan, China.

Plant Cell Reports
|March 24, 2021
PubMed
Summary

SlTCP26 promotes tomato lateral branching by inhibiting auxin and abscisic acid (ABA) signaling. This gene relieves apical dominance and lateral bud dormancy, enhancing shoot development.

Keywords:
Abscisic acidIAALateral branchSlTCP26 geneTomato

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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Hormone Signaling

Background:

  • Lateral branching is crucial for plant architecture.
  • TCP transcription factors are implicated in plant development.
  • Hormonal crosstalk, particularly involving auxin and abscisic acid (ABA), regulates lateral bud outgrowth.

Purpose of the Study:

  • To identify and characterize the role of SlTCP26 in tomato lateral branch development.
  • To investigate the interaction between SlTCP26 and auxin (IAA) and ABA signaling pathways.
  • To elucidate the molecular mechanisms underlying SlTCP26-mediated regulation of apical dominance and lateral bud dormancy.

Main Methods:

  • Gene identification and characterization in tomato.
  • Overexpression studies of SlTCP26.
  • Analysis of gene expression related to IAA and ABA signaling.
  • Decapitation experiments to study apical dominance.
  • Exogenous hormone application assays.

Main Results:

  • Overexpression of SlTCP26 significantly promoted lateral branch development in tomato.
  • SlTCP26 suppressed the expression of genes involved in IAA signaling, mimicking decapitation effects.
  • Exogenous IAA application inhibited SlTCP26 expression.
  • SlTCP26 overexpression inhibited ABA signaling-related gene expression, similar to decapitated plants.

Conclusions:

  • SlTCP26 acts as a negative regulator of auxin signaling, relieving apical dominance.
  • SlTCP26 suppresses abscisic acid signaling, promoting lateral bud dormancy release.
  • SlTCP26 is a key regulator integrating ABA and IAA signals for lateral shoot development in tomato.