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Drought and oxidative load in the leaves of C-3 plants: a predominant role for photorespiration?

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2002
Authors
Noctor, G
Veljović-Jovanović, Sonja
Driscoll, S
Novitskaya, L
Foyer, CH
Article (Published version)
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Abstract
Although active oxygen species are produced at high rates in both the chloroplasts and peroxisomes of the leaves Of C-3 plants, most attention has focused on the potentially damaging consequences of enhanced chloroplastic production in stress conditions such as drought. This article attempts to provide quantitative estimates of the relative contributions of the chloroplast electron transport chain and the glycolate oxidase reaction to the oxidative load placed on the photosynthetic leaf cell. Rates of photorespiratory H2O2 production were obtained from photosynthetic and photorespiratory flux rates, derived from steady-state leaf gas exchange measurements at varying irradiance and ambient CO2. Assuming a 10 % allocation of photosynthetic electron flow to the Mehler reaction, photorespiratory H2O2 production would account for about 70 % of total H2O2 formed at all irradiances measured. When chloroplastic CO2 concentration rates are decreased, photorespiration becomes even more predomina...nt in H2O2 generation. At the increased flux through photorespiration observed at lower ambient CO2, the Mehler reaction would have to account for more than 35 % of the total photosynthetic electron flow in order to match the rate of peroxisomal H2O2 production. The potential signalling role of H2O2 produced in the peroxisomes is emphasized, and it is demonstrated that photorespiratory H2O2 can perturb the redox states of leaf antioxidant pools. We discuss the interactions between oxidants, antioxidants and redox changes leading to modified gene expression, particularly in relation to drought, and call attention to the potential significance of photorespiratory H2O2 in signalling and acclimation.

Keywords:
wheat (Triticum aestivum) / photorespiration / oxidative load / modelling / Mehler-peroxidase / H2O2 / glutathione / catalase / barley (Hordeum vulgare) / antioxidant
Source:
Annals of Botany, 2002, 89, 841-850
Publisher:
  • Oxford Univ Press, Oxford

DOI: 10.1093/aob/mcf096

ISSN: 0305-7364

PubMed: 12102510

WoS: 000176402100006

Scopus: 2-s2.0-0036593051
[ Google Scholar ]
454
URI
http://rimsi.imsi.bg.ac.rs/handle/123456789/74
Collections
  • Radovi istraživača / Researchers’ publications
Institution/Community
Institut za multidisciplinarna istraživanja
TY  - JOUR
AU  - Noctor, G
AU  - Veljović-Jovanović, Sonja
AU  - Driscoll, S
AU  - Novitskaya, L
AU  - Foyer, CH
PY  - 2002
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/74
AB  - Although active oxygen species are produced at high rates in both the chloroplasts and peroxisomes of the leaves Of C-3 plants, most attention has focused on the potentially damaging consequences of enhanced chloroplastic production in stress conditions such as drought. This article attempts to provide quantitative estimates of the relative contributions of the chloroplast electron transport chain and the glycolate oxidase reaction to the oxidative load placed on the photosynthetic leaf cell. Rates of photorespiratory H2O2 production were obtained from photosynthetic and photorespiratory flux rates, derived from steady-state leaf gas exchange measurements at varying irradiance and ambient CO2. Assuming a 10 % allocation of photosynthetic electron flow to the Mehler reaction, photorespiratory H2O2 production would account for about 70 % of total H2O2 formed at all irradiances measured. When chloroplastic CO2 concentration rates are decreased, photorespiration becomes even more predominant in H2O2 generation. At the increased flux through photorespiration observed at lower ambient CO2, the Mehler reaction would have to account for more than 35 % of the total photosynthetic electron flow in order to match the rate of peroxisomal H2O2 production. The potential signalling role of H2O2 produced in the peroxisomes is emphasized, and it is demonstrated that photorespiratory H2O2 can perturb the redox states of leaf antioxidant pools. We discuss the interactions between oxidants, antioxidants and redox changes leading to modified gene expression, particularly in relation to drought, and call attention to the potential significance of photorespiratory H2O2 in signalling and acclimation.
PB  - Oxford Univ Press, Oxford
T2  - Annals of Botany
T1  - Drought and oxidative load in the leaves of C-3 plants: a predominant role for photorespiration?
EP  - 850
SP  - 841
VL  - 89
DO  - 10.1093/aob/mcf096
ER  - 
@article{
author = "Noctor, G and Veljović-Jovanović, Sonja and Driscoll, S and Novitskaya, L and Foyer, CH",
year = "2002",
abstract = "Although active oxygen species are produced at high rates in both the chloroplasts and peroxisomes of the leaves Of C-3 plants, most attention has focused on the potentially damaging consequences of enhanced chloroplastic production in stress conditions such as drought. This article attempts to provide quantitative estimates of the relative contributions of the chloroplast electron transport chain and the glycolate oxidase reaction to the oxidative load placed on the photosynthetic leaf cell. Rates of photorespiratory H2O2 production were obtained from photosynthetic and photorespiratory flux rates, derived from steady-state leaf gas exchange measurements at varying irradiance and ambient CO2. Assuming a 10 % allocation of photosynthetic electron flow to the Mehler reaction, photorespiratory H2O2 production would account for about 70 % of total H2O2 formed at all irradiances measured. When chloroplastic CO2 concentration rates are decreased, photorespiration becomes even more predominant in H2O2 generation. At the increased flux through photorespiration observed at lower ambient CO2, the Mehler reaction would have to account for more than 35 % of the total photosynthetic electron flow in order to match the rate of peroxisomal H2O2 production. The potential signalling role of H2O2 produced in the peroxisomes is emphasized, and it is demonstrated that photorespiratory H2O2 can perturb the redox states of leaf antioxidant pools. We discuss the interactions between oxidants, antioxidants and redox changes leading to modified gene expression, particularly in relation to drought, and call attention to the potential significance of photorespiratory H2O2 in signalling and acclimation.",
publisher = "Oxford Univ Press, Oxford",
journal = "Annals of Botany",
title = "Drought and oxidative load in the leaves of C-3 plants: a predominant role for photorespiration?",
pages = "850-841",
volume = "89",
doi = "10.1093/aob/mcf096"
}
Noctor, G., Veljović-Jovanović, S., Driscoll, S., Novitskaya, L.,& Foyer, C.. (2002). Drought and oxidative load in the leaves of C-3 plants: a predominant role for photorespiration?. in Annals of Botany
Oxford Univ Press, Oxford., 89, 841-850.
https://doi.org/10.1093/aob/mcf096
Noctor G, Veljović-Jovanović S, Driscoll S, Novitskaya L, Foyer C. Drought and oxidative load in the leaves of C-3 plants: a predominant role for photorespiration?. in Annals of Botany. 2002;89:841-850.
doi:10.1093/aob/mcf096 .
Noctor, G, Veljović-Jovanović, Sonja, Driscoll, S, Novitskaya, L, Foyer, CH, "Drought and oxidative load in the leaves of C-3 plants: a predominant role for photorespiration?" in Annals of Botany, 89 (2002):841-850,
https://doi.org/10.1093/aob/mcf096 . .

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