Article (Scientific journals)
Selection of chlorophyll fluorescence parameters as indicators of photosynthetic efficiency in large scale plant ecological studies
Bussotti, F.; Gerosa, G.; Digrado, Anthony et al.
2020In Ecological Indicators, 108 (January), p. 105686
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Keywords :
Chlorophyll fluorescence; Field surveys; Open-top chambers; Photochemical and thermal phases; Principal Component Analysis; Chemical analysis; Chlorophyll; Ecology; Electron transport properties; Fluorescence; Indicators (chemical); Large dataset; Physiological models; Physiology; Quantum chemistry; Surveys; Two photon processes; Chlorophyll fluorescence parameters; Open top chambers; Photosynthetic efficiency; Photosynthetic organisms; Physiological indicators
Abstract :
[en] Many morphological, chemical and physiological indicators have been proposed to evaluate the conditions of plants in ecological systems. Among them, the analysis of the prompt fluorescence (PF) of chlorophyll is considered a powerful tool that combines the richness of the achievable information with the operational quickness. This technique is especially suitable in large ecological surveys, where it is required to screen many samples in a brief time. The PF allows evaluating photochemical properties and functionalities of photosynthetic organisms utilizing a set of parameters, known as ‘JIP-test’. The distinct phases of the photochemical processes in terms of energy absorption, trapping and electron transport can be described by these parameters. In this paper, we re-analyse large PF datasets obtained in past researches, carried out in field conditions (forests, plantations and pasture meadows) and in experimental setups (semi-controlled conditions). The aim was to explore the relationships (redundancy and independence) among the JIP-test parameters to select the most suitable ones to capture the variability of plant photosynthetic efficiency and their responses to environmental pressures. The Principal Component Analysis (PCA) was applied to 43,987 measurements. The overall PCA results evidenced that the variability of the PF parameters is explicated mainly by two factors, connected respectively to the processes of photon capture and first photochemical events, and to the efficiency of the electron transport around the photosystem I. This result suggests that, in ecological studies, the photosynthetic functioning of the member of a population can be effectively described with two parameters representative of these two phases: the maximum quantum yield of primary photochemistry of a dark-adapted sample (FV/FM) and the amplitude of the I-P phase (ΔVIP). FV/FM and ΔVIP probed to be independent and their correlation in various datasets may be either positive or negative in relation to the environmental factors considered. The physiological significance of the correlations between these parameters is discussed. © 2019 Elsevier Ltd
Disciplines :
Environmental sciences & ecology
Agriculture & agronomy
Author, co-author :
Bussotti, F.;  Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Firenze, Piazzale delle Cascine 28, Firenze, 50144, Italy
Gerosa, G.;  Department of Mathematics and Physics, Catholic University, Via Musei 41, Brescia, 25121, Italy
Digrado, Anthony ;  Université de Liège - ULiège
Pollastrini, M.;  Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Firenze, Piazzale delle Cascine 28, Firenze, 50144, Italy
Language :
English
Title :
Selection of chlorophyll fluorescence parameters as indicators of photosynthetic efficiency in large scale plant ecological studies
Publication date :
2020
Journal title :
Ecological Indicators
ISSN :
1470-160X
eISSN :
1872-7034
Publisher :
Elsevier, New York, United States - New York
Volume :
108
Issue :
January
Pages :
105686
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 July 2021

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