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Can leaf net photosynthesis acclimate to rising and more variable temperatures?
Stockholm University, Faculty of Science, Department of Physical Geography.
Number of Authors: 42019 (English)In: Plant, Cell and Environment, ISSN 0140-7791, E-ISSN 1365-3040, Vol. 42, no 6, p. 1913-1928Article in journal (Refereed) Published
Abstract [en]

Under future climates, leaf temperature (T-l) will be higher and more variable. This will affect plant carbon (C) balance because photosynthesis and respiration both respond to short-term (subdaily) fluctuations in T-l and acclimate in the longer term (days to months). This study asks the question: To what extent can the potential and speed of photosynthetic acclimation buffer leaf C gain from rising and increasing variable T-l? We quantified how increases in the mean and variability of growth temperature affect leaf performance (mean net CO2 assimilation rates, A(net); its variability; and time under near-optimal photosynthetic conditions), as mediated by thermal acclimation. To this aim, the probability distribution of A(net) was obtained by combining a probabilistic description of short- and long-term changes in T-l with data on A(net) responses to these changes, encompassing 75 genera and 111 species, including both C3 and C4 species. Our results show that (a) expected increases in T-l variability will decrease mean A(net) and increase its variability, whereas the effects of higher mean T-l depend on species and initial T-l, and (b) acclimation reduces the effects of leaf warming, maintaining A(net) at >80% of its maximum under most thermal regimes.

Place, publisher, year, edition, pages
2019. Vol. 42, no 6, p. 1913-1928
Keywords [en]
climate change, global change, leaf net CO2 assimilation rate, rising temperatures, stochastic process, temperature variability, thermal acclimation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-170125DOI: 10.1111/pce.13525ISI: 000468970600010PubMedID: 30706948OAI: oai:DiVA.org:su-170125DiVA, id: diva2:1332001
Available from: 2019-06-27 Created: 2019-06-27 Last updated: 2019-06-27Bibliographically approved

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Vico, GiuliaWay, Danielle A.Hurry, VaughanManzoni, Stefano
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