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Related Experiment Video

Updated: May 20, 2026

A Technical Perspective in Modern Tree-ring Research - How to Overcome Dendroecological and Wood Anatomical Challenges

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A rapid decrease in temperature induces latewood formation in artificially reactivated cambium of conifer stems.

Shahanara Begum¹, Satoshi Nakaba, Yusuke Yamagishi

¹Tokyo University of Agriculture and Technology, Fuchu-Tokyo, Japan.

Annals of Botany

|July 31, 2012

Summary

A rapid temperature decrease in conifer stems induced smaller, thicker-walled tracheids, mimicking latewood formation. This demonstrates the cambium

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Area of Science:

Plant physiology
Wood biology
Forestry science

Background:

Latewood formation in conifers is linked to declining cambial activity late in the growing season.
Temperature fluctuations may significantly influence wood development in trees.

Purpose of the Study:

To investigate the impact of a sudden temperature drop on tracheid cellular morphology.
To examine cambial reactivation and xylem differentiation under controlled cooling conditions in *Cryptomeria japonica* and *Abies firma*.

Main Methods:

Localized stem heating was applied to *C. japonica* trees and *A. firma* seedlings.
Heating was ceased after specific numbers of tracheid files developed.
Tracheid dimensions and cell wall characteristics were analyzed using image analysis and scanning electron microscopy.

Main Results:

Localized heating accelerated cambial reactivation and xylem differentiation in both species.
A rapid temperature decrease resulted in narrower tracheids with thickened cell walls, resembling latewood.
These changes were observed in *A. firma* after one week and more pronounced after two to three weeks in both species.

Conclusions:

A localized reduction in stem temperature directly influences tracheid diameter and cell wall thickness.
This indicates that the vascular cambium and its derivatives exhibit direct responsiveness to thermal changes.