Solar-induced chlorophyll fluorescence imperfectly tracks the temperature response of photosynthesis in winter wheat

Ruonan Chen; Xinjie Liu; Jidai Chen; Shanshan Du; Liangyun Liu

doi:10.1093/jxb/erac388

Solar-induced chlorophyll fluorescence imperfectly tracks the temperature response of photosynthesis in winter wheat

J Exp Bot. 2022 Dec 8;73(22):7596-7610. doi: 10.1093/jxb/erac388.

Authors

Ruonan Chen^{1

2}, Xinjie Liu¹, Jidai Chen^{1

2}, Shanshan Du¹, Liangyun Liu^{1

2}

Affiliations

¹ Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China.
² College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China.

PMID: 36173362
DOI: 10.1093/jxb/erac388

Abstract

Solar-induced fluorescence (SIF) is a promising proxy for photosynthesis, but it is unclear whether it performs well in tracking the gross primary productivity (GPP) under different environmental conditions. In this study, we investigated the dynamics of the two parameters from October 2020 to June 2021 in field-grown winter wheat (Triticum aestivum) and found that the ability of SIF to track GPP was weakened at low temperatures. Accounting for the coupling of light and temperature at a seasonal scale, we found that SIF yield showed a lower temperature sensitivity and had a lower but broader optimal temperature range compared with light-use efficiency (LUE), although both SIF yield and LUE decreased in low-temperature conditions. The discrepancy between the temperature responses of SIF yield and GPP caused an increase in the ratio of SIF/GPP in winter, which indicated the variation in the relationship between them during this period. The results of our study highlight the impact of low temperature on the relationship between SIF and GPP and show the necessity of reconsidering the dynamics of energy distribution inside plants under changing environments.

Keywords: Triticum aestivum; Canopy scale; chlorophyll; gross primary production; low temperature; remote sensing; seasonal photosynthesis dynamics; solar-induced fluorescence; wheat.

MeSH terms

Triticum*