Axial resin duct quantification in tree rings: A functional defense trait

Area of Science:

• * Botany
• * Wood Science
• * Ecology

Background:

• * Resin ducts in tree xylem indicate tree defense against insects and pathogens.
• * Retrospective analysis of resin ducts reveals changes in defense capacity over time.
• * Factors like climate and disturbance influence tree defense mechanisms.

Purpose of the Study:

• * To provide standardized methods for measuring axial resin ducts in secondary xylem.
• * To establish consistent quantification protocols and terminology for resin duct analysis.
• * To facilitate cross-comparison of resin duct data among different studies.

Main Methods:

• * Detailed steps for preparing tree cores for resin duct measurement.
• * Procedures for imaging and measuring individual resin ducts within the xylem.
• * Development of software code for compiling duct measurements into chronologies.

Main Results:

• * Established protocols for consistent quantification of xylem resin ducts.
• * Provided standardized and unstandardized resin duct metrics for further analysis.
• * Enabled the creation of complete resin duct chronologies from tree core data.

Conclusions:

• * The presented methods ensure reliable quantification of tree defense capacity.
• * Standardized protocols will improve the comparability of future research on tree resilience.
• * This work supports the analysis of climate and disturbance impacts on tree defense over time.