Signaling and Integration of Defense Functions of Tocopherol, Ascorbate and Glutathione

Foyer, Christine H.; Trebst, Achim; Noctor, Graham

doi:10.1007/1-4020-3579-9_16

Cited by 32 publications

(15 citation statements)

References 226 publications

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“…However, aqueous and lipid-phase antioxidant capacities are linked (e.g. through Asc.-mediated regeneration of tocopherol moieties) (Foyer, Trebst & Noctor 2006), so an increase in lipid-phase antioxidant capacity may be expected to impact on aqueous-phase antioxidant capacity. Ascorbate is a major water-soluble antioxidant; it directly scavenges ozone (Baier et al 2005) and is involved in scavenging H2O2 (Asada 1992).…”

Section: Discussionmentioning

confidence: 99%

Isoprene synthesis protects transgenic tobacco plants from oxidative stress

Vickers

Possell

Cojocariu

et al. 2009

Plant Cell & Environment

221

236

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Isoprene emission represents a significant loss of carbon to those plant species that synthesize this highly volatile and reactive compound. As a tool for studying the role of isoprene in plant physiology and biochemistry, we developed transgenic tobacco plants capable of emitting isoprene in a similar manner to and at rates comparable to a naturally emitting species.Thermotolerance of photosynthesis against transient high-temperature episodes could only be observed in lines emitting high levels of isoprene; the effect was very mild and could only be identified over repetitive stress events. However, isoprene-emitting plants were highly resistant to ozone-induced oxidative damage compared with their non-emitting azygous controls. In ozone-treated plants, accumulation of toxic reactive oxygen species (ROS) was inhibited, and antioxidant levels were higher. Isopreneemitting plants showed remarkably decreased foliar damage and higher rates of photosynthesis compared to nonemitting plants immediately following oxidative stress events. An inhibition of hydrogen peroxide accumulation in isoprene-emitting plants may stall the programmed cell death response which would otherwise lead to foliar necrosis. These results demonstrate that endogenously produced isoprene provides protection from oxidative damage.

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Section: Discussionmentioning

confidence: 99%

Isoprene synthesis protects transgenic tobacco plants from oxidative stress

Vickers

Possell

Cojocariu

et al. 2009

Plant Cell & Environment

221

236

View full text Add to dashboard Cite

show abstract

“…It is important to appreciate that at low to moderate light fluences plants and algae synthesize relatively abundant amounts of antioxidants, such as tocopherol, ascorbate, and glutathione in their photosynthetic compartments to protect macromolecules and cellular machinery against oxidative damage (Foyer et al 2006;Kreiger-Liszkay and Trebst 2006). Not surprisingly, therefore, tocopherol biosynthesis responds to oxidative stress, including high light fluences in higher plants (Torres et al 1989;Munne-Bosch and Alegre 2002;Havaux et al 2005a) and cyanobacteria (Backasch et al 2005), and to moderate fluences in algae (Kreiger-Liszkay and Trebst 2006).…”

Section: Is Singlet O 2 Involved In D1 Protein Degradation?mentioning

confidence: 99%

D1-protein dynamics in photosystem II: the lingering enigma

2008

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The D1/D2 heterodimer core is the heart of the photosystem II reaction center. A characteristic feature of this heterodimer is the differentially rapid, light-dependent degradation of the D1 protein. The D1 protein is possibly the most researched photosynthetic polypeptide, with aspects of structure-function, gene, messenger and protein regulation, electron transport, reactive oxygen species, photoinhibition, herbicide binding, stromal-granal translocations, reversible phosphorylation, and specific proteases, all under intensive investigation more than three decades after the protein's debut in the literature. This review will touch on some treaded areas of D1 research that have, so far, defied clear resolution, as well as cutting edge research on mechanisms and consequences of D1 protein degradation.

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“…2003). While xanthophylls are efficient quenchers of excited chl triplets in the distal and proximal parts of light antennae, β,β‐carotene is an effective quencher in the core antenna (Foyer et al. 2006).…”

mentioning

confidence: 99%

“…Photoprotection by xanthophyll pigments may assist the development of phytoplankton blooms under high irradiance conditions (Fujiki et al 2003). While xanthophylls are efficient quenchers of excited chl triplets in the distal and proximal parts of light antennae, b,b-carotene is an effective quencher in the core antenna (Foyer et al 2006). It is also an efficient quencher of singlet oxygen (Foote et al 1970) and a radical-trapping antioxidant, inhibiting low density lipoprotein oxidation (Jialal et al 1991).…”

mentioning

confidence: 99%

GROWTH AND PHOTOPROTECTION IN THREE DINOFLAGELLATES (INCLUDING TWO STRAINS OF ALEXANDRIUM TAMARENSE) AND ONE DIATOM EXPOSED TO FOUR WEEKS OF NATURAL AND ENHANCED ULTRAVIOLET‐B RADIATION¹

Laurion

Roy

2009

Journal of Phycology

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Long-term growth response to natural solar radiation with enhanced ultraviolet-B (UVB) exposure was examined in two species of dinoflagellates [Alexandrium tamarense (M. Lebour) Balech, At, and Heterocapsa triquetra (Ehrenb.) F. Stein, Ht], including two strains of A. tamarense, one from Spain and another from UK, and one diatom species (Thalassiosira pseudonana Hasle et Heimdal). We examined whether variable photoprotection (mycosporine-like amino acids [MAAs] and xanthophyll-cycle pigments) affected photosynthetic performance, phytoplankton light absorption, and growth. Growth rate was significantly reduced under enhanced UVB for the UK strain of At and for Ht (both grew very little) as well as for the diatom (that maintained high growth rates), but there was no effect for the Spanish strain of At. MAA concentration was high in the dinoflagellates, but undetectable in the diatom, which instead used the xanthophyll cycle for photoprotection. The highest cell concentrations of MAAs and photoprotective pigments were observed in the UK strain of At, along with lowest growth rates and F v ⁄ F m , indicating high stress levels. In contrast, the Spanish strain showed progressive acclimation to the experimental conditions, with no significant difference in growth between treatments. Increase in total MAAs followed linearly the cumulative UVB of the preceding day, and both total and primary MAAs were maintained at higher constitutive levels in this strain. Acclimation to enhanced UVB in the diatom resulted in an increase in PSII activity and reduction in nonphotochemical quenching, indicating an increased resistance to photoinhibition after a few weeks. All four species showed increased phytoplankton light absorption under enhanced UVB. Large intrastrain differences suggest a need to consider more closely intraspecific variability in UV studies.

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Signaling and Integration of Defense Functions of Tocopherol, Ascorbate and Glutathione

Cited by 32 publications

References 226 publications

Isoprene synthesis protects transgenic tobacco plants from oxidative stress

Isoprene synthesis protects transgenic tobacco plants from oxidative stress

D1-protein dynamics in photosystem II: the lingering enigma

GROWTH AND PHOTOPROTECTION IN THREE DINOFLAGELLATES (INCLUDING TWO STRAINS OF ALEXANDRIUM TAMARENSE) AND ONE DIATOM EXPOSED TO FOUR WEEKS OF NATURAL AND ENHANCED ULTRAVIOLET‐B RADIATION¹

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Signaling and Integration of Defense Functions of Tocopherol, Ascorbate and Glutathione

Cited by 32 publications

References 226 publications

Isoprene synthesis protects transgenic tobacco plants from oxidative stress

Isoprene synthesis protects transgenic tobacco plants from oxidative stress

D1-protein dynamics in photosystem II: the lingering enigma

GROWTH AND PHOTOPROTECTION IN THREE DINOFLAGELLATES (INCLUDING TWO STRAINS OF ALEXANDRIUM TAMARENSE) AND ONE DIATOM EXPOSED TO FOUR WEEKS OF NATURAL AND ENHANCED ULTRAVIOLET‐B RADIATION1

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GROWTH AND PHOTOPROTECTION IN THREE DINOFLAGELLATES (INCLUDING TWO STRAINS OF ALEXANDRIUM TAMARENSE) AND ONE DIATOM EXPOSED TO FOUR WEEKS OF NATURAL AND ENHANCED ULTRAVIOLET‐B RADIATION¹