Effects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize

Structural–physiological factors affect the accurate estimation of vegetation gross primary production (GPP) under various types of environmental stress. Solar-induced chlorophyll fluorescence (SIF), which is directly linked to photosynthesis, has been effectively used to estimate and mon...

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Autores principales:	Jidai Chen, Xinjie Liu, ShanShan Du, Yan Ma, Liangyun Liu
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Chlorophyll fluorescence crop water stress index (CWSI) drought gross primary production maize Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809
Acceso en línea:	https://doaj.org/article/c06ec8d19d664605b0379a27fdb46892
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spelling	oai:doaj.org-article:c06ec8d19d664605b0379a27fdb468922021-11-18T00:00:31ZEffects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize2151-153510.1109/JSTARS.2021.3123111https://doaj.org/article/c06ec8d19d664605b0379a27fdb468922021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9591453/https://doaj.org/toc/2151-1535Structural–physiological factors affect the accurate estimation of vegetation gross primary production (GPP) under various types of environmental stress. Solar-induced chlorophyll fluorescence (SIF), which is directly linked to photosynthesis, has been effectively used to estimate and monitor GPP. However, understanding of the physiological mechanism linking SIF to GPP under stress remains limited. In this article, the link between SIF and GPP at diurnal and seasonal timescales was explored for a maize field and its response to drought stress (as defined by the crop water stress index, CWSI) using three-years of continuous tower-based measurements was investigated. The results show that the ratio of GPP to SIF decreased with increasing drought stress levels, and the canopy stomata conductance (Gs) declined synchronously. Compared to two canopy structural factors (NDVI and NIRv), both the Pearson and partial correlation coefficients for the relationship between Gs and the ratio of GPP to the total SIF was higher (0.38, p < 0.01 and 0.32, p < 0.01 with photosynthetically active radiation as the control variable, respectively). We also found that <inline-formula><tex-math notation="LaTeX">${{\bf \Phi }_F}$</tex-math></inline-formula> tracked the changes in LUE well under drought conditions (CWSI > 0.6), which demonstrated that SIF can be a powerful parameter for estimating GPP under drought stress. However, there was a smaller drop in <inline-formula><tex-math notation="LaTeX">${{\bf \Phi }_F}$</tex-math></inline-formula> under drought stress (slope = –0.002) compared to the slope for the relationship between LUE and CWSI (–0.08). The response of light reactions to drought stress may be muted compared to the stomatal response. These findings confirm that the Gs is sensitive to drought and is important for the SIF-based GPP estimation model. It also provides reliable evidence that SIF data include a large amount of physiological information and can serve as a potential indicator for detecting drought and estimating GPP.Jidai ChenXinjie LiuShanShan DuYan MaLiangyun LiuIEEEarticleChlorophyll fluorescencecrop water stress index (CWSI)droughtgross primary productionmaizeOcean engineeringTC1501-1800Geophysics. Cosmic physicsQC801-809ENIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 14, Pp 11148-11161 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chlorophyll fluorescence crop water stress index (CWSI) drought gross primary production maize Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809
spellingShingle	Chlorophyll fluorescence crop water stress index (CWSI) drought gross primary production maize Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 Jidai Chen Xinjie Liu ShanShan Du Yan Ma Liangyun Liu Effects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize
description	Structural–physiological factors affect the accurate estimation of vegetation gross primary production (GPP) under various types of environmental stress. Solar-induced chlorophyll fluorescence (SIF), which is directly linked to photosynthesis, has been effectively used to estimate and monitor GPP. However, understanding of the physiological mechanism linking SIF to GPP under stress remains limited. In this article, the link between SIF and GPP at diurnal and seasonal timescales was explored for a maize field and its response to drought stress (as defined by the crop water stress index, CWSI) using three-years of continuous tower-based measurements was investigated. The results show that the ratio of GPP to SIF decreased with increasing drought stress levels, and the canopy stomata conductance (Gs) declined synchronously. Compared to two canopy structural factors (NDVI and NIRv), both the Pearson and partial correlation coefficients for the relationship between Gs and the ratio of GPP to the total SIF was higher (0.38, p < 0.01 and 0.32, p < 0.01 with photosynthetically active radiation as the control variable, respectively). We also found that <inline-formula><tex-math notation="LaTeX">${{\bf \Phi }_F}$</tex-math></inline-formula> tracked the changes in LUE well under drought conditions (CWSI > 0.6), which demonstrated that SIF can be a powerful parameter for estimating GPP under drought stress. However, there was a smaller drop in <inline-formula><tex-math notation="LaTeX">${{\bf \Phi }_F}$</tex-math></inline-formula> under drought stress (slope = –0.002) compared to the slope for the relationship between LUE and CWSI (–0.08). The response of light reactions to drought stress may be muted compared to the stomatal response. These findings confirm that the Gs is sensitive to drought and is important for the SIF-based GPP estimation model. It also provides reliable evidence that SIF data include a large amount of physiological information and can serve as a potential indicator for detecting drought and estimating GPP.
format	article
author	Jidai Chen Xinjie Liu ShanShan Du Yan Ma Liangyun Liu
author_facet	Jidai Chen Xinjie Liu ShanShan Du Yan Ma Liangyun Liu
author_sort	Jidai Chen
title	Effects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize
title_short	Effects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize
title_full	Effects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize
title_fullStr	Effects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize
title_full_unstemmed	Effects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize
title_sort	effects of drought on the relationship between photosynthesis and chlorophyll fluorescence for maize
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/c06ec8d19d664605b0379a27fdb46892
work_keys_str_mv	AT jidaichen effectsofdroughtontherelationshipbetweenphotosynthesisandchlorophyllfluorescenceformaize AT xinjieliu effectsofdroughtontherelationshipbetweenphotosynthesisandchlorophyllfluorescenceformaize AT shanshandu effectsofdroughtontherelationshipbetweenphotosynthesisandchlorophyllfluorescenceformaize AT yanma effectsofdroughtontherelationshipbetweenphotosynthesisandchlorophyllfluorescenceformaize AT liangyunliu effectsofdroughtontherelationshipbetweenphotosynthesisandchlorophyllfluorescenceformaize
_version_	1718425249766178816

Effects of Drought on the Relationship Between Photosynthesis and Chlorophyll Fluorescence for Maize

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