Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence

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The relationship between the Photochemical Reflectance Index (PRI), Normalized Difference Vegetation Index (NDVI) and chlorophyll fluorescence along senescence was investigated in this work. Reflectance and radiance measurements were performed at canopy level in grass species presenting different ph...

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Autores principales:	Cordon, Gabriela Beatriz, Lagorio, María Gabriela
Publicado:	2016
Materias:	Normalized difference vegetation index Photochemical reflectance index Photosynthetic parameters Radiation use efficiency Senescence Sun-induced chlorophyll fluorescence chlorophyll pigment Avena fluorescence metabolism photochemistry photosynthesis physiology plant leaf radiation response Setaria (plant) time factor Chlorophyll Fluorescence Photochemical Processes Photosynthesis Pigments, Biological Plant Leaves Setaria Plant Time Factors
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01761617_v199_n_p100_Cordon http://hdl.handle.net/20.500.12110/paper_01761617_v199_n_p100_Cordon
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	paper:paper_01761617_v199_n_p100_Cordon2023-06-08T15:19:05Z Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence Cordon, Gabriela Beatriz Lagorio, María Gabriela Normalized difference vegetation index Photochemical reflectance index Photosynthetic parameters Radiation use efficiency Senescence Sun-induced chlorophyll fluorescence chlorophyll pigment Avena fluorescence metabolism photochemistry photosynthesis physiology plant leaf radiation response Setaria (plant) time factor Avena Chlorophyll Fluorescence Photochemical Processes Photosynthesis Pigments, Biological Plant Leaves Setaria Plant Time Factors The relationship between the Photochemical Reflectance Index (PRI), Normalized Difference Vegetation Index (NDVI) and chlorophyll fluorescence along senescence was investigated in this work. Reflectance and radiance measurements were performed at canopy level in grass species presenting different photosynthetic metabolism: Avena sativa (C3) and Setaria italica (C4), at different stages of the natural senescence process. Sun induced-chlorophyll fluorescence at 760 nm (SIF760) and the apparent fluorescence yield (SIF760/a, with a = irradiance at time of measurement) were extracted from the radiance spectra of canopies using the Fraunhofer Line Discrimination-method. The photosynthetic parameters derived from Kautsky kinetics and pigment content were also calculated at leaf level.Whilst stand level NDVI patterns were related to changes in the structure of canopies and not in pigment content, stand level PRI patterns suggested changes both in terms of canopy and of pigment content in leaves. Both SIF760/a and ΦPSII decreased progressively along senescence in both species. A strong increment in NPQ was evident in A. sativa while in S. italica NPQ values were lower. Our most important finding was that two chlorophyll fluorescence signals, ΦPSII and SIF760/a, correlated with the canopy PRI values in the two grasses assessed, even when tissues at different ontogenic stages were present. Even though significant changes occurred in the Total Chlr/Car ratio along senescence in both studied species, significant correlations between PRI and chlorophyll fluorescence signals might indicate the usefulness of this reflectance index as a proxy of photosynthetic RUE, at least under the conditions of this study. The relationships between stand level PRI and the fluorescence estimators (ΦPSII and SIF760/a) were positive in both cases. Therefore, an increase in PRI values as in the fluorescence parameters would indicate higher RUE. © 2016 Elsevier GmbH. Fil:Cordon, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lagorio, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01761617_v199_n_p100_Cordon http://hdl.handle.net/20.500.12110/paper_01761617_v199_n_p100_Cordon
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Normalized difference vegetation index Photochemical reflectance index Photosynthetic parameters Radiation use efficiency Senescence Sun-induced chlorophyll fluorescence chlorophyll pigment Avena fluorescence metabolism photochemistry photosynthesis physiology plant leaf radiation response Setaria (plant) time factor Avena Chlorophyll Fluorescence Photochemical Processes Photosynthesis Pigments, Biological Plant Leaves Setaria Plant Time Factors
spellingShingle	Normalized difference vegetation index Photochemical reflectance index Photosynthetic parameters Radiation use efficiency Senescence Sun-induced chlorophyll fluorescence chlorophyll pigment Avena fluorescence metabolism photochemistry photosynthesis physiology plant leaf radiation response Setaria (plant) time factor Avena Chlorophyll Fluorescence Photochemical Processes Photosynthesis Pigments, Biological Plant Leaves Setaria Plant Time Factors Cordon, Gabriela Beatriz Lagorio, María Gabriela Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence
topic_facet	Normalized difference vegetation index Photochemical reflectance index Photosynthetic parameters Radiation use efficiency Senescence Sun-induced chlorophyll fluorescence chlorophyll pigment Avena fluorescence metabolism photochemistry photosynthesis physiology plant leaf radiation response Setaria (plant) time factor Avena Chlorophyll Fluorescence Photochemical Processes Photosynthesis Pigments, Biological Plant Leaves Setaria Plant Time Factors
description	The relationship between the Photochemical Reflectance Index (PRI), Normalized Difference Vegetation Index (NDVI) and chlorophyll fluorescence along senescence was investigated in this work. Reflectance and radiance measurements were performed at canopy level in grass species presenting different photosynthetic metabolism: Avena sativa (C3) and Setaria italica (C4), at different stages of the natural senescence process. Sun induced-chlorophyll fluorescence at 760 nm (SIF760) and the apparent fluorescence yield (SIF760/a, with a = irradiance at time of measurement) were extracted from the radiance spectra of canopies using the Fraunhofer Line Discrimination-method. The photosynthetic parameters derived from Kautsky kinetics and pigment content were also calculated at leaf level.Whilst stand level NDVI patterns were related to changes in the structure of canopies and not in pigment content, stand level PRI patterns suggested changes both in terms of canopy and of pigment content in leaves. Both SIF760/a and ΦPSII decreased progressively along senescence in both species. A strong increment in NPQ was evident in A. sativa while in S. italica NPQ values were lower. Our most important finding was that two chlorophyll fluorescence signals, ΦPSII and SIF760/a, correlated with the canopy PRI values in the two grasses assessed, even when tissues at different ontogenic stages were present. Even though significant changes occurred in the Total Chlr/Car ratio along senescence in both studied species, significant correlations between PRI and chlorophyll fluorescence signals might indicate the usefulness of this reflectance index as a proxy of photosynthetic RUE, at least under the conditions of this study. The relationships between stand level PRI and the fluorescence estimators (ΦPSII and SIF760/a) were positive in both cases. Therefore, an increase in PRI values as in the fluorescence parameters would indicate higher RUE. © 2016 Elsevier GmbH.
author	Cordon, Gabriela Beatriz Lagorio, María Gabriela
author_facet	Cordon, Gabriela Beatriz Lagorio, María Gabriela
author_sort	Cordon, Gabriela Beatriz
title	Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence
title_short	Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence
title_full	Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence
title_fullStr	Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence
title_full_unstemmed	Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence
title_sort	chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01761617_v199_n_p100_Cordon http://hdl.handle.net/20.500.12110/paper_01761617_v199_n_p100_Cordon
work_keys_str_mv	AT cordongabrielabeatriz chlorophyllfluorescencephotochemicalreflectiveindexandnormalizeddifferencevegetativeindexduringplantsenescence AT lagoriomariagabriela chlorophyllfluorescencephotochemicalreflectiveindexandnormalizeddifferencevegetativeindexduringplantsenescence
_version_	1768546720553107456

Chlorophyll fluorescence, photochemical reflective index and normalized difference vegetative index during plant senescence

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