Sunflecks in the upper canopy : dynamics of light-use efficiency in sun and shade leaves of Fagus sylvatica

Show full item record



Permalink

http://hdl.handle.net/10138/346666

Citation

Durand , M , Stangl , Z R , Salmon , Y , Burgess , A J , Murchie , E H & Robson , T M 2022 , ' Sunflecks in the upper canopy : dynamics of light-use efficiency in sun and shade leaves of Fagus sylvatica ' , New Phytologist , vol. 235 , no. 4 , pp. 1365-1378 . https://doi.org/10.1111/nph.18222

Title: Sunflecks in the upper canopy : dynamics of light-use efficiency in sun and shade leaves of Fagus sylvatica
Author: Durand, Maxime; Stangl, Zsofia R.; Salmon, Yann; Burgess, Alexandra J.; Murchie, Erik H.; Robson, T. Matthew
Contributor organization: Canopy Spectral Ecology and Ecophysiology
Organismal and Evolutionary Biology Research Programme
University of Helsinki
Department of Forest Sciences
Institute for Atmospheric and Earth System Research (INAR)
Viikki Plant Science Centre (ViPS)
Micrometeorology and biogeochemical cycles
Ecosystem processes (INAR Forest Sciences)
Date: 2022-08
Language: eng
Number of pages: 14
Belongs to series: New Phytologist
ISSN: 0028-646X
DOI: https://doi.org/10.1111/nph.18222
URI: http://hdl.handle.net/10138/346666
Abstract: Sunflecks are transient patches of direct radiation that provide a substantial proportion of the daily irradiance to leaves in the lower canopy. In this position, faster photosynthetic induction would allow for higher sunfleck-use efficiency, as is commonly reported in the literature. Yet, when sunflecks are too few and far between, it may be more beneficial for shade leaves to prioritize efficient photosynthesis under shade. We investigated the temporal dynamics of photosynthetic induction, recovery under shade, and stomatal movement during a sunfleck, in sun and shade leaves of Fagus sylvatica from three provenances of contrasting origin. We found that shade leaves complete full induction in a shorter time than sun leaves, but that sun leaves respond faster than shade leaves due to their much larger amplitude of induction. The core-range provenance achieved faster stomatal opening in shade leaves, which may allow for better sunfleck-use efficiency in denser canopies and lower canopy positions. Our findings represent a paradigm shift for future research into light fluctuations in canopies, drawing attention to the ubiquitous importance of sunflecks for photosynthesis, not only in lower-canopy leaves where shade is prevalent, but particularly in the upper canopy where longer sunflecks are more common due to canopy openness.
Subject: canopy vertical gradients
Fagus sylvatica
photosynthetic induction
provenance trial
stomatal dynamics
sun and shade leaves
sunfleck
TROPICAL RAIN-FOREST
PHOTOSYNTHETIC INDUCTION
PIGMENT COMPOSITION
GAS-EXCHANGE
MESOPHYLL CONDUCTANCE
STOMATAL RESPONSES
ENERGY-DISSIPATION
VERTICAL GRADIENT
FLUCTUATING LIGHT
STEADY-STATE
11831 Plant biology
Peer reviewed: Yes
Rights: cc_by_nc
Usage restriction: openAccess
Self-archived version: publishedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
New_Phytologist ... n_sun_and_shade_leaves.pdf 1.937Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record