Too many photons: photorespiration, photoinhibition and photooxidation

Osmond, Barry; Badger, Murray R.; Maxwell, Kate; Björkman, Olle; Leegood, Richard C.

doi:10.1016/s1360-1385(97)80981-8

Cited by 198 publications

(119 citation statements)

References 12 publications

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“…Prominent among these is the phenomenon described as nonphotochemical quenching of chlorophyll fluorescence (NPQ) (1). This term, however, describes a collection of processes, playing a variety of different roles in the regulation of photochemistry, including state transitions [phosphorylation-related migration of chlorophyll-binding proteins (light-harvesting complex II, LHCII) between photosystem (PS) II and PSI (3)], photoinhibition (slowly reversible damage to PSII reaction centers) (4), and pHdependent (or high-energy state) quenching (qE) resulting from an increase in the thermal dissipation capacity of the lightcollecting apparatus (1,5,6).…”

mentioning

confidence: 99%

A zeaxanthin-independent nonphotochemical quenching mechanism localized in the photosystem II core complex

Finazzi

Johnson

Dall’Osto

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

131

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Illumination of dark-adapted barley plants with low light transiently induced a large nonphotochemical quenching of chlorophyll fluorescence. This reaction was identified as a form of high-energy-state quenching. Its appearance was not accompanied by zeaxanthin synthesis but was associated with a reversible inactivation of a fraction of photosystem II (PSII) centers. Both the fluorescence quenching and PSII inactivation relaxed in parallel with the activation of the Calvin cycle. We interpret the induction of this phenomenon as due to the generation of a quenched state in the PSII core complex. This reaction is probably caused by the transient overacidification of the thylakoid lumen, whereas its dissipation results from the relaxation of both the pH gradient across the thylakoid membrane and redox pressure upon activation of carbon fixation. At saturating light intensities, inactivation of PSII was still observed at the onset of illumination, although its recovery did not result in dissipation of high-energy quenching, which presents typical characteristics of an antenna-associated quenching at steady state. Reaction-center quenching seems therefore to be a common transient feature during illumination, being replaced by other phenomena (photochemical or antenna quenching and photoinhibition), depending on the balance between light and carbon fixation fluxes

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mentioning

confidence: 99%

A zeaxanthin-independent nonphotochemical quenching mechanism localized in the photosystem II core complex

Finazzi

Johnson

Dall’Osto

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

131

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“…eral plants (Desikan et al, 1998;Delledonne et al, 2001;Krause and Durner, 2004). Energy dissipation mechanisms such as photorespiration or the water-water cycle (Asada, 2006) prevent excessive photoreduction of oxygen, which could potentially generate an excess of ROS, leading to photooxidation (Kozaki and Takeba, 1996;Osmond et al, 1997). Thus, inhibition of GDC should result in enhanced ROS.…”

Section: Mitochondrial and Cellular Responses To Gdc Inhibitionmentioning

confidence: 99%

Regulation of Plant Glycine Decarboxylase byS-Nitrosylation and Glutathionylation

et al. 2010

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Mitochondria play an essential role in nitric oxide (NO) signal transduction in plants. Using the biotin-switch method in conjunction with nano-liquid chromatography and mass spectrometry, we identified 11 candidate proteins that were S-nitrosylated and/or glutathionylated in mitochondria of Arabidopsis (Arabidopsis thaliana) leaves. These included glycine decarboxylase complex (GDC), a key enzyme of the photorespiratory C 2 cycle in C3 plants. GDC activity was inhibited by S-nitrosoglutathione due to S-nitrosylation/S-glutathionylation of several cysteine residues. Gas-exchange measurements demonstrated that the bacterial elicitor harpin, a strong inducer of reactive oxygen species and NO, inhibits GDC activity. Furthermore, an inhibitor of GDC, aminoacetonitrile, was able to mimic mitochondrial depolarization, hydrogen peroxide production, and cell death in response to stress or harpin treatment of cultured Arabidopsis cells. These findings indicate that the mitochondrial photorespiratory system is involved in the regulation of NO signal transduction in Arabidopsis.

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“…photosynthetically active photon flux density: RWC, relative water content; cf>pSn, relative quantum efficiency of pho tosystem II photochemistry; ip, water potential. photoreduction of oxygen occurs, especially under severe drought conditions, resulting in the forma tion of activated oxygen species such as singlet ox ygen, superoxide radical and lipid peroxides, which can lead to photodamage, chlorophyll de gradation, and lipid peroxidation (Smirnoff, 1993;Foyer et al, 1994;Asada, 1996;Osmond et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

α-Tocopherol Protection Against Drought-Induced Damage In Rosmarinus Officinalis L. And Melissa Officinalis L.

Munné‐Bosch

Schwarz²,

Alegre³

1999

Zeitschrift Für Naturforschung C

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a-Tocopherol, Photosynthesis, Drought, Rosmarinus officinalis, Melissa officinalis Summer diurnal variations of photosynthesis and a-tocopherol content were measured in relation to natural drought in field-grown rosemary (Rosmarinus officinalis L.) and lemon balm (Melissa officinalis L.) plants. During the summer relative water contents (RW C) of ca. 40% in Rosmarinus officinalis and ca. 30% in Melissa officinalis were attained, indicating severe drought. Both species showed similar diurnal patterns of net C 0 2 assimilation rates (A ) with a wide plateau of maximum photosynthesis at midday in the absence of drought and one peak of maximum photosynthesis early in the morning under drought conditions. Net C 0 2 assimilation rates decreased by ca. 75% due to drought in both species. Melissa officinalis plants showed a significant decrease in the relative quantum efficiency of PSII photochemistry (4>psn), ratio of variable to maximum fluorescence yield (F J F m) and chloro phyll content of leaves by ca. 25% under drought conditions at midday. In contrast, cJ)pSI1, F J F m and chlorophyll content remained constant throughout the experiment in R. officinalis plants. Although the non-photochemical quenching of chlorophyll fluorescence increased from ca. 1.8 to 3 and the a-tocopherol content rose fifteen fold in both species in response to drought, only R. officinalis plants were able to avoid oxidative damage under drought conditions by the joint increase of carotenoids and a-tocopherol.

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Too many photons: photorespiration, photoinhibition and photooxidation

Cited by 198 publications

References 12 publications

A zeaxanthin-independent nonphotochemical quenching mechanism localized in the photosystem II core complex

A zeaxanthin-independent nonphotochemical quenching mechanism localized in the photosystem II core complex

Regulation of Plant Glycine Decarboxylase byS-Nitrosylation and Glutathionylation

α-Tocopherol Protection Against Drought-Induced Damage In Rosmarinus Officinalis L. And Melissa Officinalis L.

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