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Consistent decrease in conifer embolism resistance from the stem apex to base resulting from axial trends in tracheid

Dario Zambonini1, Tadeja Savi2, Sabine Rosner2

  • 1Dept. Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Legnaro (PD), Italy.

Frontiers in Plant Science
|July 11, 2024
PubMed
Summary

Conifer embolism vulnerability varies along the stem due to changes in tracheid and pit traits. This study reveals a strong relationship between distance from the stem apex and xylem pressure, crucial for understanding drought stress responses.

Keywords:
P50cavitationembolismlumen diameterpitstracheidsvulnerability curvexylem

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Area of Science:

  • Plant physiology
  • Forest ecology
  • Wood anatomy

Background:

  • Drought-induced embolism formation in conifers is linked to specific tracheid and pit traits.
  • These anatomical traits exhibit parallel variation from the stem apex to the base.

Purpose of the Study:

  • To investigate if axial anatomical variability correlates with progressive changes in embolism vulnerability along the conifer stem.
  • To assess the relationship between tracheid hydraulic diameter (Dh), pit membrane area (PMA), and embolism vulnerability (P50) with distance from the stem apex (DFA).

Main Methods:

  • Assessed Dh, PMA, and P50 in longitudinal stem segments of *Picea abies* and *Abies alba* at varying DFA.
  • Analyzed scaling relationships between anatomical traits and embolism vulnerability along the stem.

Main Results:

  • Dh and PMA scaled with DFA^0.2 in both species.
  • P50 varied by over 3 MPa from treetop to stem base, with significant changes occurring within the first 1.5 meters from the apex.
  • PMA and Dh showed a more than isometric scaling (exponent b=1.2), indicating proportional variation with tracheid lumen diameter.

Conclusions:

  • Apex-to-base trends in tracheid/pit traits and P50 demonstrate a strong structure-function relationship influenced by DFA.
  • Analyzing the P50-DFA relationship is crucial for a comprehensive assessment of individual tree embolism vulnerability.
  • Findings highlight the importance of considering axial variation in anatomical traits for understanding conifer drought response.