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Updated: Jul 15, 2026
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Xylem Water Distribution in Woody Plants Visualized with a Cryo-scanning Electron Microscope
Published on: June 20, 2019
Optimal conditions for visualizing water-conducting pathways in a living tree by the dye injection method
Toshihiro Umebayashi1, Yasuhiro Utsumi, Shinya Koga
1Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Hakozaki 812 -8581, Japan.
Tree Physiology
|April 4, 2007
Summary
Accurate dye tracing in trees requires optimized procedures. Acid fuchsin at 0.1% effectively delineates water pathways in xylem within 2 hours, minimizing artifacts for reliable sap stream analysis.
Area of Science:
- Plant Physiology
- Xylem Transport
- Dendrochronology
Background:
- Understanding water transport in trees is crucial for ecological and agricultural studies.
- The dye injection method is commonly used to visualize xylem sap flow.
- Artifacts can arise from improper dye selection and tissue preparation.
Purpose of the Study:
- To optimize dye injection procedures for studying water-conducting pathways in living trees.
- To quantitatively evaluate commonly used dyes for their efficacy and potential artifacts.
- To establish precise experimental conditions for accurate sap stream analysis.
Main Methods:
- Quantitative evaluation of acid fuchsin, basic fuchsin, and safranin properties and concentrations.
- Dye injection into the sap stream of Pieris japonica.
- Assessment of dye movement (vertical and horizontal) and xylem cell staining.
- Microscopic examination of stained tissues at varying time intervals post-injection.
Main Results:
- An aqueous solution of acid fuchsin (≥0.1%) proved most effective for delineating water movement.
- Acid fuchsin exhibited limited vertical movement but rapid horizontal movement via capillarity and diffusion.
- Optimal staining of most xylem cells occurred within 2 hours of injection.
- Delays exceeding 2 hours between injection and examination significantly reduced method precision.
Conclusions:
- Acid fuchsin is a suitable dye for tracing water movement in trees when used at appropriate concentrations (≥0.1%).
- Strict adherence to experimental timing (within 2 hours) is essential to prevent misleading results.
- Well-defined procedures are critical for the reliable application of the dye injection method in studying functional water-conducting pathways.
