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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Photosynthesis, chlorophyll fluorescence and photochemical reflectance index in photoinhibited leaves

Kouki Hikosaka https://orcid.org/0000-0003-1744-3775
+ Author Affiliations
- Author Affiliations

A Graduate School of Life Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan.

B Email: hikosaka@tohoku.ac.jp

Functional Plant Biology 48(8) 815-826 https://doi.org/10.1071/FP20365
Submitted: 26 November 2020  Accepted: 10 March 2021   Published: 9 April 2021

Abstract

Solar-induced chlorophyll (chl) fluorescence (SIF) has been shown to be positively correlated with vegetation photosynthesis, suggesting that it is a useful signal for understanding of environmental responses and spatial heterogeneity of photosynthetic activity at various scales from leaf to the globe. Photosynthesis is often inhibited in stressful environments (photoinhibition), but how photoinhibition influences the relationship between photosynthesis and chl fluorescence remains unclear. Here, I studied light energy allocation among photosynthesis, chl fluorescence and heat dissipation in photoinhibited leaves and tested whether photosynthesis in photoinhibited leaves can be evaluated from chl fluorescence and reflectance spectra in remote sensing. Chl fluorescence and reflection spectra were examined with the pulse amplified modulation (PAM) system and spectroradiometer, respectively. Photoinhibited leaves had lower photosynthetic rates and quantum yields of photochemistry (ΦP) and higher chl fluorescence yields. Consequently, photosynthesis was negatively correlated with chl fluorescence, which contrasts the positive relationships between photosynthesis and SIF observed in past remote sensing studies. This suggests that vegetation photosynthesis evaluated solely from chl fluorescence may be overestimated if the vegetation is dominated by severely photoinhibited leaves. When a model of energy allocation was applied, ΦP estimated from chl fluorescence and photochemical reflectance index (PRI) significantly correlated with the observed ΦP, suggesting that the model is useful to evaluate photosynthetic activities of photoinhibited leaves by remote sensing.

Keywords: energy allocation, gross primary production (GPP), heat dissipation, non-photochemical quenching (NPQ), photoinhibition, photosystem II (PSII), PRI, quantum yield, remote sensing.


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