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Updated: Feb 15, 2026

Xylem Water Distribution in Woody Plants Visualized with a Cryo-scanning Electron Microscope
Published on: June 20, 2019
Continuous root xylem formation and vascular acclimation to water deficit involves endodermal ABA signalling via
Prashanth Ramachandran1, Guodong Wang1, Frauke Augstein1
1Department of Organismal Biology, Physiological Botany, Evolutionary Biology Centre and Linnean Centre for Plant Biology, Uppsala University, Ullsv. 24E, SE-75651 Uppsala, Sweden.
Plant root xylem development is regulated by abscisic acid (ABA). ABA signaling influences xylem morphology under water stress, impacting water transport and plant survival.
Area of Science:
- Plant Biology
- Molecular Biology
- Environmental Science
Background:
- The plant root xylem is crucial for water transport to the shoot.
- Xylem's morphological plasticity under environmental stress, like drought, is not well understood.
Purpose of the Study:
- To investigate the role of abscisic acid (ABA) in regulating xylem development and morphology.
- To elucidate the signaling pathway by which ABA influences xylem structure under water-limited conditions in *Arabidopsis*.
Main Methods:
- Analysis of *Arabidopsis* mutants with impaired ABA biosynthesis and signaling.
- Application of external ABA and induction of water stress.
- Gene expression analysis, including microRNA and transcription factor profiling.
Main Results:
- Impaired ABA signaling led to defects in xylem continuity.
- External ABA application or water stress induced the formation of extra xylem strands.
- ABA signaling in the endodermis activated MIR165A, increasing miR165 to repress HD-ZIP transcription factors in the stele.
Conclusions:
- Non-cell autonomous ABA signaling is essential for proper xylem development.
- ABA signaling modulates plant xylem morphology in response to environmental stress.
- A known developmental pathway is repurposed for adaptive xylem modification under stress.
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