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Updated: Aug 12, 2025

Relating Stomatal Conductance to Leaf Functional Traits

Relating Stomatal Conductance to Leaf Functional Traits

Published on: October 12, 2015

Variations in leaf anatomical characteristics drive the decrease of mesophyll conductance in poplar under elevated

Yansen Xu^1,2, Zhaozhong Feng^1,2, Jinlong Peng³

¹Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing, China.

Global Change Biology

|January 31, 2023

Summary

This summary is machine-generated.

Elevated ozone (O3) reduces plant photosynthesis by decreasing mesophyll conductance (gm). Leaf anatomy changes, like thicker cell walls, drive this decline, impacting plant health.

Keywords:

leaf anatomy mesophyll conductance meta-analysis ozone photosynthesis poplar

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Published on: July 12, 2024

Area of Science:

Plant Physiology
Environmental Science
Plant Anatomy

Background:

Elevated ozone (O3) significantly limits plant photosynthesis, primarily through reduced mesophyll conductance (gm).
Leaf anatomical traits influence gm, but O3-induced anatomical changes affecting gm remain unclear.
Understanding these relationships is crucial for predicting plant responses to climate change.

Approach:

Investigated the impact of elevated O3 on photosynthetic capacity and leaf anatomy in two poplar clones.
Assessed the relationship between specific leaf anatomical properties and mesophyll conductance under O3 stress.
Conducted a global meta-analysis to identify general patterns of gm and leaf anatomy responses to O3.

Key Points:

O3-induced reduction in gm critically limits leaf photosynthesis.
Declines in gm under elevated O3 are driven by liquid-phase conductance changes, linked to thicker cell walls and smaller chloroplasts.
O3 effects on mesophyll cell traits and their contribution to gm are genotype-dependent.

Conclusions:

Anatomical adjustments to O3 stress can constrain mesophyll conductance and reduce photosynthesis.
Provides the first evidence linking O3-induced leaf anatomical changes to limitations in mesophyll conductance.
Highlights the importance of considering leaf anatomy in plant responses to air pollution.