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Updated: May 30, 2026

Visualizing Cellular Gibberellin Levels Using the nlsGPS1 Förster Resonance Energy Transfer (FRET) Biosensor

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Published on: January 12, 2019

Gibberellin partly mediates LANCEOLATE activity in tomato.

Osnat Yanai¹, Eilon Shani, Dor Russ

¹The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture and the Otto Warburg Minerva Center for Agricultural Biotechnology, Hebrew University, Rehovot 76100, Israel.

The Plant Journal : for Cell and Molecular Biology

|July 21, 2011

Summary

The LANCEOLATE (LA) gene in tomato regulates leaf complexity by influencing gibberellin (GA) levels. This study reveals LA

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Area of Science:

Plant Biology
Molecular Genetics
Developmental Biology

Background:

Leaf complexity in tomato (Solanum lycopersicum) is regulated by morphogenetic activity.
The CIN-TCP transcription factor LANCEOLATE (LA) promotes leaf differentiation and is negatively regulated by miR319.
Plant hormone gibberellin (GA) also influences tomato leaf complexity.

Purpose of the Study:

To investigate the relationship between LANCEOLATE (LA) activity and gibberellin (GA) signaling in tomato leaf development.
To elucidate the molecular mechanisms by which LA influences GA biosynthesis and response.

Main Methods:

Analysis of gene expression for SlGA20ox1 and SlGA2ox4 in transgenic tomato lines with altered LA or miR319 levels.
Phenotypic analysis of tomato mutants affecting GA biosynthesis or response (PROCERA).
Application of exogenous GA to assess rescue of miR319 overexpression phenotypes.

Main Results:

LA activity positively regulates GA biosynthesis (SlGA20ox1) and negatively regulates GA deactivation (SlGA2ox4).
miR319 overexpression leads to increased SlGA2ox4 expression and enhanced leaf complexity.
Exogenous GA application and mutations in GA response inhibitors (PRO) suppress miR319 overexpression phenotypes.

Conclusions:

LA-mediated regulation of leaf complexity involves modulation of GA levels.
The miR319-LA pathway interacts with GA signaling to control leaf development.
LA likely regulates GA biosynthesis and deactivation genes to fine-tune GA homeostasis for leaf elaboration.