Could the differences in O(3) sensitivity between two poplar clones be related to a difference in antioxidant defense and secondary metabolic response to O(3) influx?
Identifieur interne : 003662 ( Main/Corpus ); précédent : 003661; suivant : 003663Could the differences in O(3) sensitivity between two poplar clones be related to a difference in antioxidant defense and secondary metabolic response to O(3) influx?
Auteurs : Daniela Di Baccio ; Antonella Castagna ; Elena Paoletti ; Luca Sebastiani ; Annamaria RanieriSource :
- Tree physiology [ 0829-318X ] ; 2008.
English descriptors
- KwdEn :
- Antioxidants (metabolism), Ascorbic Acid (metabolism), Chlorophyll (metabolism), Fluorescence (MeSH), Gene Expression (MeSH), Glutathione (metabolism), Hydrogen Peroxide (metabolism), Oxidation-Reduction (MeSH), Oxidative Stress (MeSH), Ozone (metabolism), Phenols (metabolism), Photosynthesis (MeSH), Plant Leaves (metabolism), Plant Proteins (genetics), Plant Proteins (metabolism), Plant Stomata (metabolism), Populus (enzymology), Populus (metabolism), Reactive Oxygen Species (metabolism).
- MESH :
- chemical , genetics : Plant Proteins.
- chemical , metabolism : Antioxidants, Ascorbic Acid, Chlorophyll, Glutathione, Hydrogen Peroxide, Ozone, Phenols, Plant Proteins, Reactive Oxygen Species.
- enzymology : Populus.
- metabolism : Plant Leaves, Plant Stomata, Populus.
- Fluorescence, Gene Expression, Oxidation-Reduction, Oxidative Stress, Photosynthesis.
Abstract
Increasing global background concentrations of tropospheric ozone (O(3)) are expected to affect both crops and forest ecosystems negatively. The phytotoxic effects of O(3) are mainly associated with the O(3)-induced production of reactive oxygen species (ROS) in excess of the ability of the plant to maintain ROS below the tolerance threshold. It is the balance between O(3) uptake and cellular antioxidant potential that determines O(3) effects on vegetation. The greater sensitivity to ambient O(3) exposure (60 nl l(-1) O(3), 15 days, 5 h a day) of poplar clone Eridano (Populus deltoides x maximowiczii) compared with clone I-214 (P. x euramericana) was reflected in a lower photosynthetic efficiency, higher stomatal conductance and hydrogen peroxide (H(2)O(2)) accumulation and more pronounced leaf tissue membrane injury in Eridano than in I-214. We checked if the differences in clonal responses to O(3) fumigation were related to differing capacities for antioxidant defense and phenylpropanoid metabolism and found that the increases in foliar ascorbate and phenolic concentrations and phenylpropanoid metabolism in Eridano were insufficient to counteract H(2)O(2) accumulation and the consequent oxidative stress. This was probably because the higher influx of O(3) into Eridano leaves compared with I-214 leaves resulted in a lower potential detoxification capacity per unit of O(3) influx.
DOI: 10.1093/treephys/28.12.1761
PubMed: 19193559
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pubmed:19193559Le document en format XML
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The phytotoxic effects of O(3) are mainly associated with the O(3)-induced production of reactive oxygen species (ROS) in excess of the ability of the plant to maintain ROS below the tolerance threshold. It is the balance between O(3) uptake and cellular antioxidant potential that determines O(3) effects on vegetation. The greater sensitivity to ambient O(3) exposure (60 nl l(-1) O(3), 15 days, 5 h a day) of poplar clone Eridano (Populus deltoides x maximowiczii) compared with clone I-214 (P. x euramericana) was reflected in a lower photosynthetic efficiency, higher stomatal conductance and hydrogen peroxide (H(2)O(2)) accumulation and more pronounced leaf tissue membrane injury in Eridano than in I-214. We checked if the differences in clonal responses to O(3) fumigation were related to differing capacities for antioxidant defense and phenylpropanoid metabolism and found that the increases in foliar ascorbate and phenolic concentrations and phenylpropanoid metabolism in Eridano were insufficient to counteract H(2)O(2) accumulation and the consequent oxidative stress. This was probably because the higher influx of O(3) into Eridano leaves compared with I-214 leaves resulted in a lower potential detoxification capacity per unit of O(3) influx.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">19193559</PMID><DateCompleted><Year>2009</Year><Month>03</Month><Day>05</Day></DateCompleted><DateRevised><Year>2019</Year><Month>05</Month><Day>13</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0829-318X</ISSN><JournalIssue CitedMedium="Print"><Volume>28</Volume><Issue>12</Issue><PubDate><Year>2008</Year><Month>Dec</Month></PubDate></JournalIssue><Title>Tree physiology</Title><ISOAbbreviation>Tree Physiol</ISOAbbreviation></Journal><ArticleTitle>Could the differences in O(3) sensitivity between two poplar clones be related to a difference in antioxidant defense and secondary metabolic response to O(3) influx?</ArticleTitle><Pagination><MedlinePgn>1761-72</MedlinePgn></Pagination><Abstract><AbstractText>Increasing global background concentrations of tropospheric ozone (O(3)) are expected to affect both crops and forest ecosystems negatively. The phytotoxic effects of O(3) are mainly associated with the O(3)-induced production of reactive oxygen species (ROS) in excess of the ability of the plant to maintain ROS below the tolerance threshold. It is the balance between O(3) uptake and cellular antioxidant potential that determines O(3) effects on vegetation. The greater sensitivity to ambient O(3) exposure (60 nl l(-1) O(3), 15 days, 5 h a day) of poplar clone Eridano (Populus deltoides x maximowiczii) compared with clone I-214 (P. x euramericana) was reflected in a lower photosynthetic efficiency, higher stomatal conductance and hydrogen peroxide (H(2)O(2)) accumulation and more pronounced leaf tissue membrane injury in Eridano than in I-214. We checked if the differences in clonal responses to O(3) fumigation were related to differing capacities for antioxidant defense and phenylpropanoid metabolism and found that the increases in foliar ascorbate and phenolic concentrations and phenylpropanoid metabolism in Eridano were insufficient to counteract H(2)O(2) accumulation and the consequent oxidative stress. 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