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Limits to photosynthesis: seasonal shifts in supply and demand for CO2 in Scots pine

Stangl, Zsofia Reka and Tarvainen, Lasse and Wallin, Goran and Marshall, John D (2021). Limits to photosynthesis: seasonal shifts in supply and demand for CO2 in Scots pine. New Phytologist. 233 , 1108-1120
[Research article]

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Abstract

Boreal forests undergo a strong seasonal photosynthetic cycle; however, the underlying processes remain incompletely characterized. Here, we present a novel analysis of the seasonal diffusional and biochemical limits to photosynthesis (A(net)) relative to temperature and light limitations in high-latitude mature Pinus sylvestris, including a high-resolution analysis of the seasonality of mesophyll conductance (g(m)) and its effect on the estimation of carboxylation capacity (VCmax). We used a custom-built gas-exchange system coupled to a carbon isotope analyser to obtain continuous measurements for the estimation of the relevant shoot gas-exchange parameters and quantified the biochemical and diffusional controls alongside the environmental controls over A(net). The seasonality of A(net) was strongly dependent on VCmax and the diffusional limitations. Stomatal limitation was low in spring and autumn but increased to 31% in June. By contrast, mesophyll limitation was nearly constant (19%). We found that VCmax limited A(net) in the spring, whereas daily temperatures and the gradual reduction of light availability limited A(net) in the autumn, despite relatively high VCmax. We describe for the first time the role of mesophyll conductance in connection with seasonal trends in net photosynthesis of P. sylvestris, revealing a strong coordination between g(m) and A(net), but not between g(m) and stomatal conductance.

Authors/Creators:Stangl, Zsofia Reka and Tarvainen, Lasse and Wallin, Goran and Marshall, John D
Title:Limits to photosynthesis: seasonal shifts in supply and demand for CO2 in Scots pine
Series Name/Journal:New Phytologist
Year of publishing :2021
Volume:233
Page range:1108-1120
Number of Pages:13
Publisher:WILEY
ISSN:0028-646X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:boreal forest, carboxylation capacity, diffusional limitations, light limitation, mesophyll conductance, Pinus sylvestris, stomatal conductance, temperature limitation
URN:NBN:urn:nbn:se:slu:epsilon-p-114909
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114909
Additional ID:
Type of IDID
DOI10.1111/nph.17856
Web of Science (WoS)000727254000001
ID Code:26743
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:17 Jan 2022 14:25
Metadata Last Modified:17 Jan 2022 14:31

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