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Updated: Jan 8, 2026

Author Spotlight: Leaf Trait Analysis for Climate and Ecology Reconstruction in Modern and Ancient Plant Communities

Author Spotlight: Leaf Trait Analysis for Climate and Ecology Reconstruction in Modern and Ancient Plant Communities

Published on: October 25, 2024

Making a clean break: contrasting leaf abscission dynamics across temperate leaf habits.

Cade N Kane¹, Ian M Rimer², Scott A M McAdam²

¹Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.

Annals of Botany

|December 18, 2025

Summary

Leaf senescence and abscission are distinct processes in temperate trees, with varying physiological patterns influencing leaf lifespan. Understanding these differences is crucial for predicting tree responses to climate change.

Keywords:

Ginkgo biloba Lonicera × purpusii Phellodendron amurense Quercus falcata abscission deciduous embolism phenology senescence temperate

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Published on: December 31, 2012

Area of Science:

Plant physiology
Ecology
Forest science

Background:

Leaf abscission is a regulated process of leaf shedding at the abscission zone (AZ).
Leaf senescence, a nutrient reclamation phase, often precedes abscission but their timing varies.
Physiological regulation of leaf abscission in trees is poorly understood, influenced by environmental and endogenous signals.

Purpose of the Study:

To investigate the roles of water status, gas exchange, senescence, and abscisic acid (ABA) in regulating leaf abscission.
To characterize the physiological diversity in leaf abscission processes across different temperate tree types.

Main Methods:

Developed a novel method to quantify abscission zone competency (AZC).
Measured leaf gas exchange, chlorophyll content, water potential, AZC, and ABA levels in four temperate tree species.
Assessed associations between physiological traits and AZC throughout the season.

Main Results:

Deciduous species exhibited contrasting patterns: one senesced before AZC, the other photosynthesized until AZC.
Brevi-deciduous species showed gradual AZC with significant chlorophyll degradation.
Marcescent species' leaves senesced but did not develop AZC.

Conclusions:

Leaf senescence and abscission are distinct and variably timed processes in temperate trees.
Physiological diversity in leaf abscission regulation is significant and understudied.
Findings have implications for predicting leaf lifespan under changing climate conditions.