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Stem diameter changes before bud opening in Zelkova serrata saplings.

Kiyotsugu Yoda1, Hiromichi Wagatsuma, Mitsuo Suzuki

  • 1Faculty of Science and Engineering, Ishinomaki Senshu University, Ishinomaki, Miyagi 986-8580, Japan. yoda@isenshu-u.ac.jp

Journal of Plant Research
|February 28, 2003
PubMed
Summary

Deciduous trees exhibit stem diameter changes during winter, even when leafless. These fluctuations signal internal physiological activities preceding bud opening, not water-related changes.

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Area of Science:

  • Plant physiology
  • Woody plant biology
  • Dendrochronology

Background:

  • Stem diameter fluctuations in woody plants are typically linked to diurnal water content changes from transpiration and absorption.
  • Leafless deciduous trees are generally expected to show minimal stem diameter changes during winter dormancy.

Purpose of the Study:

  • To investigate whether and how stem diameter changes occur in leafless deciduous trees during winter.
  • To determine if these changes are related to water status or internal physiological processes preceding bud break.

Main Methods:

  • Continuous measurement of stem diameter changes in Zelkova serrata saplings over 4 months.
  • Observation of saplings in a leafless state during the winter dormancy period.

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Main Results:

  • Distinct stem diameter fluctuations were observed with periodicities ranging from diurnal to several weeks.
  • These diameter changes began approximately two months before the natural winter bud opening.
  • The observed changes were not correlated with water relations driven by leaf transpiration.

Conclusions:

  • Leafless deciduous trees exhibit significant stem diameter fluctuations during winter dormancy.
  • These fluctuations are indicative of internal physiological and developmental activities occurring within the stem prior to bud opening.
  • Stem diameter monitoring can serve as an indicator of pre-bud break physiological activity in deciduous trees.