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Early events in Populus hybrid and Fagus sylvatica leaves exposed to ozone.

Identifieur interne : 003299 ( Main/Exploration ); précédent : 003298; suivant : 003300

Early events in Populus hybrid and Fagus sylvatica leaves exposed to ozone.

Auteurs : R. Desotgiu ; F. Bussotti ; F. Faoro ; M. Iriti ; G. Agati ; R. Marzuoli ; G. Gerosa ; C. Tani

Source :

RBID : pubmed:20364237

Descripteurs français

English descriptors

Abstract

This paper aims to investigate early responses to ozone in leaves of Fagus sylvatica (beech) and Populus maximowiczii x Populus berolinensis (poplar). The experimental setup consisted of four open-air (OA) plots, four charcoal-filtered (CF) open-top chambers (OTCs), and four nonfiltered (NF) OTCs. Qualitative and quantitative analyses were carried out on nonsymptomatic (CF) and symptomatic (NF and OA) leaves of both species. Qualitative analyses were performed applying microscopic techniques: Evans blue staining for detection of cell viability, CeCl3 staining of transmission electron microscope (TEM) samples to detect the accumulation of H2O2, and multispectral fluorescence microimaging and microspectrofluorometry to investigate the accumulation of fluorescent phenolic compounds in the walls of the damaged cells. Quantitative analyses consisted of the analysis of the chlorophyll a fluorescence transients (fast kinetics). The early responses to ozone were demonstrated by the Evans blue and CeCl3 staining techniques that provided evidence of plant responses in both species 1 month before foliar symptoms became visible. The fluorescence transients analysis, too, demonstrated the breakdown of the oxygen evolving system and the inactivation of the end receptors of electrons at a very early stage, both in poplar and in beech. The accumulation of phenolic compounds in the cell walls, on the other hand, was a species-specific response detected in poplar, but not in beech. Evans blue and CeCl3 staining, as well as the multispectral fluorescence microimaging and microspectrofluorometry, can be used to support the field diagnosis of ozone injury, whereas the fast kinetics of chlorophyll fluorescence provides evidence of early physiological responses.

DOI: 10.1100/tsw.2010.63
PubMed: 20364237
PubMed Central: PMC5763675


Affiliations:


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Le document en format XML

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<term>Chlorophyll (metabolism)</term>
<term>Chlorophyll A (MeSH)</term>
<term>Fagus (metabolism)</term>
<term>Fagus (physiology)</term>
<term>Fagus (ultrastructure)</term>
<term>Hydrogen Peroxide (metabolism)</term>
<term>Kinetics (MeSH)</term>
<term>Microscopy, Electron, Transmission (MeSH)</term>
<term>Ozone (MeSH)</term>
<term>Plant Leaves (metabolism)</term>
<term>Plant Leaves (physiology)</term>
<term>Plant Leaves (ultrastructure)</term>
<term>Populus (metabolism)</term>
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<term>Fagus (physiologie)</term>
<term>Fagus (ultrastructure)</term>
<term>Feuilles de plante (métabolisme)</term>
<term>Feuilles de plante (physiologie)</term>
<term>Feuilles de plante (ultrastructure)</term>
<term>Microscopie électronique à transmission (MeSH)</term>
<term>Ozone (MeSH)</term>
<term>Peroxyde d'hydrogène (métabolisme)</term>
<term>Populus (métabolisme)</term>
<term>Populus (physiologie)</term>
<term>Populus (ultrastructure)</term>
<term>Spectrométrie de fluorescence (MeSH)</term>
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<div type="abstract" xml:lang="en">This paper aims to investigate early responses to ozone in leaves of Fagus sylvatica (beech) and Populus maximowiczii x Populus berolinensis (poplar). The experimental setup consisted of four open-air (OA) plots, four charcoal-filtered (CF) open-top chambers (OTCs), and four nonfiltered (NF) OTCs. Qualitative and quantitative analyses were carried out on nonsymptomatic (CF) and symptomatic (NF and OA) leaves of both species. Qualitative analyses were performed applying microscopic techniques: Evans blue staining for detection of cell viability, CeCl3 staining of transmission electron microscope (TEM) samples to detect the accumulation of H2O2, and multispectral fluorescence microimaging and microspectrofluorometry to investigate the accumulation of fluorescent phenolic compounds in the walls of the damaged cells. Quantitative analyses consisted of the analysis of the chlorophyll a fluorescence transients (fast kinetics). The early responses to ozone were demonstrated by the Evans blue and CeCl3 staining techniques that provided evidence of plant responses in both species 1 month before foliar symptoms became visible. The fluorescence transients analysis, too, demonstrated the breakdown of the oxygen evolving system and the inactivation of the end receptors of electrons at a very early stage, both in poplar and in beech. The accumulation of phenolic compounds in the cell walls, on the other hand, was a species-specific response detected in poplar, but not in beech. Evans blue and CeCl3 staining, as well as the multispectral fluorescence microimaging and microspectrofluorometry, can be used to support the field diagnosis of ozone injury, whereas the fast kinetics of chlorophyll fluorescence provides evidence of early physiological responses.</div>
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