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Updated: Mar 19, 2026

Xylem Water Distribution in Woody Plants Visualized with a Cryo-scanning Electron Microscope
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Stem Xylem Characterization for Vitis Drought Tolerance.

Laura Rustioni1, Angelo Ciacciulli1, Daniele Grossi1

  • 1Dipartimento di Scienze Agrarie e Ambientali (DISAA), Università degli Studi di Milano , via Celoria 2, 20133 Milano, Italy.

Journal of Agricultural and Food Chemistry
|June 10, 2016
PubMed
Summary

Reflectance spectroscopy effectively predicts drought tolerance in Vitis species by analyzing stem water transport and wood hydrophobicity. This technique aids in selecting new rootstocks and cultivars for improved water use efficiency.

Keywords:
grapevinephenotypingreflectance spectroscopyrootstocksuberinwater stress

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Area of Science:

  • Plant Physiology
  • Biophysics
  • Spectroscopy

Background:

  • Stem water transport and reserves are key to plant water status regulation.
  • Lianas, like Vitis species, possess stems optimized for water transport.
  • Wood composition influences plant susceptibility to water stress.

Purpose of the Study:

  • To evaluate reflectance spectroscopy for drought tolerance phenotyping in Vitis species.
  • To investigate the role of stem water transport and wood hydrophobicity in drought tolerance.
  • To explore the application of these methods for selecting new rootstocks and cultivars.

Main Methods:

  • Reflectance spectroscopy was used to analyze stems of 10 Vitis species before and after Sudan IV dye coloration.
  • Partial least squares (PLS) regression and self-organizing map (SOM) neural network analysis were employed.
  • A hydrophobicity index was developed based on Sudan IV dye absorption at 539 nm.

Main Results:

  • Spectral signatures at T0 showed species-specific features.
  • PLS and SOM analyses successfully predicted drought tolerance scores.
  • The hydrophobicity index correlated with drought tolerance, indicating the importance of hydrophobic compounds.

Conclusions:

  • Reflectance spectroscopy is a valuable tool for drought tolerance phenotyping in Vitis.
  • Hydrophobic compounds in xylem tissue act as a protective barrier against water stress.
  • These findings support the preliminary selection of rootstocks and cultivars based on water stress resistance.