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Related Experiment Video

Updated: Jun 17, 2026

The Use of Induced Somatic Sector Analysis (ISSA) for Studying Genes and Promoters Involved in Wood Formation and Secondary Stem Development
09:54

The Use of Induced Somatic Sector Analysis (ISSA) for Studying Genes and Promoters Involved in Wood Formation and Secondary Stem Development

Published on: October 5, 2016

WOX4 promotes procambial development.

Jiabing Ji1, Josh Strable, Rena Shimizu

  • 1Plant Biology Department, University of Georgia, Athens, Georgia 30602.

Plant Physiology
|January 2, 2010
PubMed
Summary
This summary is machine-generated.

The WUSCHEL-related HOMEOBOX 4 (WOX4) gene promotes vascular procambium development in plants. Studies in Arabidopsis and tomato reveal WOX4 is crucial for vascular tissue differentiation and maintenance.

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Area of Science:

  • Plant Biology
  • Developmental Biology
  • Genetics

Background:

  • Plant organs develop from meristematic tissues.
  • The WUSCHEL-related HOMEOBOX (WOX) gene family regulates initial cell populations.
  • The specific function of WOX4 has not been previously described.

Purpose of the Study:

  • To investigate the function and transcription of the WOX4 gene in Arabidopsis and tomato.
  • To understand the role of WOX4 in vascular development.

Main Methods:

  • Comparative analysis of WOX4 transcription in Arabidopsis and tomato.
  • RNA interference (RNAi) to down-regulate WOX4 in Arabidopsis.
  • In situ hybridization to analyze gene expression in RNAi plants.
  • Overexpression of SlWOX4 in transgenic tomato.

Main Results:

  • WOX4 is transcribed in developing vascular bundles of both species.
  • Down-regulation of WOX4 in Arabidopsis resulted in smaller plants with undifferentiated vascular tissue and reduced xylem/phloem.
  • WOX4 down-regulation affected expression of vascular procambium and phloem markers.
  • Overexpression of SlWOX4 in tomato led to overproliferation of vascular tissues.

Conclusions:

  • WOX4 plays a conserved role in promoting vascular procambium differentiation and/or maintenance.
  • WOX4 is essential for proper vascular tissue development in plants.