Related Experiment Videos
Loss of Tonoplast Integrity Programmed in Tracheary Element Differentiation
1Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Tokyo 113, Japan.
Plant Physiology
|November 11, 1999
Summary
Programmed cell death in plant tracheary elements (TEs) involves vacuole changes. Impaired vacuolar membrane permeability and reduced organic anion transport are key events promoting TE cell death during development.
Area of Science:
- Plant biology
- Cell biology
- Developmental biology
Background:
- Tracheary elements (TEs) are plant cells that undergo programmed cell death (PCD) during development.
- The tonoplast, or vacuolar membrane, undergoes disintegration as a critical event in TE PCD.
- Understanding vacuolar changes is crucial for elucidating TE cell death mechanisms.
Purpose of the Study:
- To investigate the role of vacuolar membrane permeability and organic anion transport in TE programmed cell death.
- To identify specific molecular events associated with vacuole changes during TE differentiation.
Main Methods:
- Utilized zinnia (Zinnia elegans L.) cell culture for studying TE development.
- Assessed fluorescein transport across the tonoplast in differentiating TEs.
- Applied probenecid, an organic anion transport inhibitor, and cycloheximide, a protein synthesis inhibitor.
Main Results:
- Fluorescein uptake and vacuolar accumulation declined in differentiating TEs.
- Probenecid treatment induced rapid TE cell death and vacuole disruption.
- Cycloheximide suppressed the observed changes in vacuolar properties.
- Probenecid abolished specific mRNA accumulation during TE differentiation.
Conclusions:
- Altered vacuolar membrane permeability is a significant factor promoting programmed cell death in tracheary elements.
- Organic anion transport plays a crucial role in maintaining vacuolar integrity and regulating TE cell death.