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

Durand, Maxime and Stangl, Zsofia R. and Stangl, Zsofia Réka and Salmon, Yann and Burgess, Alexandra J. and Murchie, Erik H. and Robson, T. Matthew (2022). Sunflecks in the upper canopy: dynamics of light-use efficiency in sun and shade leaves of Fagus sylvatica. New Phytologist. 235 :4 , 1365-1378
[Research article]

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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.

Authors/Creators:Durand, Maxime and Stangl, Zsofia R. and Stangl, Zsofia Réka and Salmon, Yann and Burgess, Alexandra J. and Murchie, Erik H. and Robson, T. Matthew
Title:Sunflecks in the upper canopy: dynamics of light-use efficiency in sun and shade leaves of Fagus sylvatica
Series Name/Journal:New Phytologist
Year of publishing :2022
Volume:235
Number:4
Page range:1365-1378
Number of Pages:14
Publisher:WILEY
ISSN:0028-646X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:canopy vertical gradients, Fagus sylvatica, photosynthetic induction, provenance trial, stomatal dynamics, sun and shade leaves, sunfleck
URN:NBN:urn:nbn:se:slu:epsilon-p-118025
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118025
Additional ID:
Type of IDID
DOI10.1111/nph.18222
Web of Science (WoS)000808525700001
ID Code:28676
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:30 Aug 2022 14:27
Metadata Last Modified:11 Sep 2022 17:59

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