Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions

Solar-induced chlorophyll fluorescence (SIF) observations from space have shown close relationships with terrestrial photosynthesis rates. SIF originates from the light reactions of photosynthesis, whereas carbon fixation takes place during the dark reactions of photosynthesis. Questions remain rega...

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Autores principales:	Zhunqiao Liu, Chenhui Guo, Yanwen Bai, Nina Zhang, Qiang Yu, Feng Zhao, Xiaoliang Lu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	solar-induced chlorophyll fluorescence gross primary productivity far-red chlorophyll fluorescence dark reactions CO<sub>2</sub> concentration air temperature Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/d1333dc944934802b131dd7484f740b9
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spelling	oai:doaj.org-article:d1333dc944934802b131dd7484f740b92021-11-25T16:38:58ZFar-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions10.3390/app1122108212076-3417https://doaj.org/article/d1333dc944934802b131dd7484f740b92021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10821https://doaj.org/toc/2076-3417Solar-induced chlorophyll fluorescence (SIF) observations from space have shown close relationships with terrestrial photosynthesis rates. SIF originates from the light reactions of photosynthesis, whereas carbon fixation takes place during the dark reactions of photosynthesis. Questions remain regarding whether SIF is able to track changes in the efficiency of the dark reactions in photosynthesis. Using concurrent measurements of leaf-scale gas exchange, pulse amplitude-modulated (PAM) fluorescence, and fluorescence spectral radiances, we found that both far-red fluorescence radiances and PAM fluorescence yields responded rapidly to changes in photosynthetic carbon assimilation due to changes in environmental factors or induced stomatal closure under constant light conditions. Uncertainties in outgoing and incoming irradiance mismatch for SIF measurements may very likely obscure the contributions of the dark reactions, thereby causing the inconsistent findings previously reported, which were no change in far-red SIF and PAM fluorescence yields after clear reductions in the photosynthetic carbon assimilation efficiency of dark reactions. Our results confirm that high-quality SIF measurements have the potential to provide insights into the dark reactions of photosynthesis. This study is particularly relevant for better interpreting satellite SIF observations that are obtained under roughly constant overpass times and relatively stable light intensities.Zhunqiao LiuChenhui GuoYanwen BaiNina ZhangQiang YuFeng ZhaoXiaoliang LuMDPI AGarticlesolar-induced chlorophyll fluorescencegross primary productivityfar-red chlorophyll fluorescencedark reactionsCO<sub>2</sub> concentrationair temperatureTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10821, p 10821 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	solar-induced chlorophyll fluorescence gross primary productivity far-red chlorophyll fluorescence dark reactions CO<sub>2</sub> concentration air temperature Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	solar-induced chlorophyll fluorescence gross primary productivity far-red chlorophyll fluorescence dark reactions CO<sub>2</sub> concentration air temperature Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Zhunqiao Liu Chenhui Guo Yanwen Bai Nina Zhang Qiang Yu Feng Zhao Xiaoliang Lu Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions
description	Solar-induced chlorophyll fluorescence (SIF) observations from space have shown close relationships with terrestrial photosynthesis rates. SIF originates from the light reactions of photosynthesis, whereas carbon fixation takes place during the dark reactions of photosynthesis. Questions remain regarding whether SIF is able to track changes in the efficiency of the dark reactions in photosynthesis. Using concurrent measurements of leaf-scale gas exchange, pulse amplitude-modulated (PAM) fluorescence, and fluorescence spectral radiances, we found that both far-red fluorescence radiances and PAM fluorescence yields responded rapidly to changes in photosynthetic carbon assimilation due to changes in environmental factors or induced stomatal closure under constant light conditions. Uncertainties in outgoing and incoming irradiance mismatch for SIF measurements may very likely obscure the contributions of the dark reactions, thereby causing the inconsistent findings previously reported, which were no change in far-red SIF and PAM fluorescence yields after clear reductions in the photosynthetic carbon assimilation efficiency of dark reactions. Our results confirm that high-quality SIF measurements have the potential to provide insights into the dark reactions of photosynthesis. This study is particularly relevant for better interpreting satellite SIF observations that are obtained under roughly constant overpass times and relatively stable light intensities.
format	article
author	Zhunqiao Liu Chenhui Guo Yanwen Bai Nina Zhang Qiang Yu Feng Zhao Xiaoliang Lu
author_facet	Zhunqiao Liu Chenhui Guo Yanwen Bai Nina Zhang Qiang Yu Feng Zhao Xiaoliang Lu
author_sort	Zhunqiao Liu
title	Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions
title_short	Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions
title_full	Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions
title_fullStr	Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions
title_full_unstemmed	Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions
title_sort	far-red chlorophyll fluorescence radiance tracks photosynthetic carbon assimilation efficiency of dark reactions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d1333dc944934802b131dd7484f740b9
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Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions

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