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Zhang C, Atherton J, Peñuelas J, Filella I, Kolari P, Aalto J, Ruhanen H, Bäck J, Porcar-Castell A. Do all chlorophyll fluorescence emission wavelengths capture the spring recovery of photosynthesis in boreal evergreen foliage? Plant Cell Environ 2019; 42:3264-3279. [PMID: 31325364 DOI: 10.1111/pce.13620] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 07/02/2019] [Accepted: 07/15/2019] [Indexed: 06/10/2023]
Abstract
Chlorophyll a fluorescence (ChlF) is closely related to photosynthesis and can be measured remotely using multiple spectral features as solar-induced fluorescence (SIF). In boreal regions, SIF shows particular promise as an indicator of photosynthesis, in part because of the limited variation of seasonal light absorption in these ecosystems. Seasonal spectral changes in ChlF could yield new information on processes such as sustained nonphotochemical quenching (NPQS ) but also disrupt the relationship between SIF and photosynthesis. We followed ChlF and functional and biochemical properties of Pinus sylvestris needles during the photosynthetic spring recovery period to answer the following: (a) How ChlF spectra change over seasonal timescales? (b) How pigments, NPQS , and total photosynthetically active radiation (PAR) absorption drive changes of ChlF spectra? (c) Do all ChlF wavelengths track photosynthetic seasonality? We found seasonal ChlF variation in the red and far-red wavelengths, which was strongly correlated with NPQS , carotenoid content, and photosynthesis (enhanced in the red), but not with PAR absorption. Furthermore, a rapid decrease in red/far-red ChlF ratio occurred in response to a cold spell, potentially relating to the structural reorganization of the photosystems. We conclude that all current SIF retrieval features can track seasonal photosynthetic dynamics in boreal evergreens, but the full SIF spectra provides additional insight.
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Affiliation(s)
- Chao Zhang
- Optics of Photosynthesis Laboratory, Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences, Viikki Plant Science Centre, University of Helsinki, Helsinki, 00014, Finland
- CREAF, Center for Ecological Research and Forestry Applications, Bellaterra, 08193, Spain
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès, 08193, Spain
| | - Jon Atherton
- Optics of Photosynthesis Laboratory, Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences, Viikki Plant Science Centre, University of Helsinki, Helsinki, 00014, Finland
| | - Josep Peñuelas
- CREAF, Center for Ecological Research and Forestry Applications, Bellaterra, 08193, Spain
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès, 08193, Spain
| | - Iolanda Filella
- CREAF, Center for Ecological Research and Forestry Applications, Bellaterra, 08193, Spain
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès, 08193, Spain
| | - Pasi Kolari
- Department of Physics, University of Helsinki, Helsinki, 00014, Finland
| | - Juho Aalto
- Department of Physics, University of Helsinki, Helsinki, 00014, Finland
- Station for Measuring Forest Ecosystem-Atmosphere Relations II (SMEAR II), Hyytiälä Forestry Field Station, University of Helsinki, Korkeakoski, 35500, Finland
| | - Hanna Ruhanen
- Natural Resources Institute Finland (Luke), Natural Resources and Bioproduction, Suonenjoki, 77600, Finland
| | - Jaana Bäck
- Department of Forest Sciences, University of Helsinki, Helsinki, 00014, Finland
| | - Albert Porcar-Castell
- Optics of Photosynthesis Laboratory, Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences, Viikki Plant Science Centre, University of Helsinki, Helsinki, 00014, Finland
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