Vertical gradients in photosynthetic physiology diverge at the latitudinal range extremes of white spruce.

Autor: Schmiege SC; Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, New York, USA.; New York Botanical Garden, Bronx, New York, USA.; Plant Resilience Institute, Michigan State University, East Lansing, Michigan, USA.; Department of Biology, Western University, London, Ontario, Canada., Griffin KL; Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, New York, USA.; Department of Earth and Environmental Sciences, Columbia University, Palisades, New York, USA.; Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA., Boelman NT; Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA., Vierling LA; Department of Natural Resources and Society, College of Natural Resources, University of Idaho, Moscow, Idaho, USA.; McCall Outdoor Science School, College of Natural Resources, University of Idaho, McCall, Idaho, USA., Bruner SG; Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, New York, USA., Min E; Department of Earth and Environmental Sciences, Columbia University, Palisades, New York, USA., Maguire AJ; Department of Natural Resources and Society, College of Natural Resources, University of Idaho, Moscow, Idaho, USA.; McCall Outdoor Science School, College of Natural Resources, University of Idaho, McCall, Idaho, USA., Jensen J; Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, New York, USA., Eitel JUH; Department of Natural Resources and Society, College of Natural Resources, University of Idaho, Moscow, Idaho, USA.; McCall Outdoor Science School, College of Natural Resources, University of Idaho, McCall, Idaho, USA.
Jazyk: angličtina
Zdroj: Plant, cell & environment [Plant Cell Environ] 2023 Jan; Vol. 46 (1), pp. 45-63. Date of Electronic Publication: 2022 Oct 14.
DOI: 10.1111/pce.14448
Abstrakt: Light availability drives vertical canopy gradients in photosynthetic functioning and carbon (C) balance, yet patterns of variability in these gradients remain unclear. We measured light availability, photosynthetic CO 2  and light response curves, foliar C, nitrogen (N) and pigment concentrations, and the photochemical reflectance index (PRI) on upper and lower canopy needles of white spruce trees (Picea glauca) at the species' northern and southern range extremes. We combined our photosynthetic data with previously published respiratory data to compare and contrast canopy C balance between latitudinal extremes. We found steep canopy gradients in irradiance, photosynthesis and leaf traits at the southern range limit, but a lack of variation across canopy positions at the northern range limit. Thus, unlike many tree species from tropical to mid-latitude forests, high latitude trees may not require vertical gradients of metabolic activity to optimize photosynthetic C gain. Consequently, accounting for self-shading is less critical for predicting gross primary productivity at northern relative to southern latitudes. Northern trees also had a significantly smaller net positive leaf C balance than southern trees suggesting that, regardless of canopy position, low photosynthetic rates coupled with high respiratory costs may ultimately constrain the northern range limit of this widely distributed boreal species.
(© 2022 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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