Mechanisms of Photodamage and Protein Degradation During Photoinhibition of Photosystem II

Andersson, Bertil; Barber, James

doi:10.1007/0-306-48135-9_4

Cited by 87 publications

(82 citation statements)

References 121 publications

(141 reference statements)

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“…High light-induced ROS act as strong oxidative agens that cause negative changes in thylakoidal photosynthetic apparatus. Oxidation on donor side of PS II, excessive reduction on the acceptor side of PSII, and consequently, destruction of D1 protein are major damages to PS II (Anderson et Barber 1996). Therefore, under both high light stress and dehydration, reactive oxygen species are considered major cause of damage in photosynthetic organisms (DemmigAdams et Adams III, 2000).…”

Section: Introductionmentioning

confidence: 99%

Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II

Barták¹,

Hájek²,

Očenášová³

2012

Czech Polar Rep.

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The paper deals with the differences in sensitivity of Antarctic lichen to photoinhibition. Thalli of Usnea antarctica were collected at the James Ross Island, Antarctica (57°52´57´´W, 63°48´02´´S) and transferred in dry state to the Czech Republic. After rewetting in a laboratory, they were exposed to 2 high light treatments: short-term (30 min), and long-term (6 h). In short-term treatment, the sample were exposed to 1000 and 2000 µmol m -2 s -1 of photosynthetically active radiation (PAR). In long-term experiment, PAR of 300, 600, and 1000 µmol m -2 s -1 were used. Photosynthetic efficiency of U. antarctica thalli was monitored by chlorophyll fluorescence parameters, potential (F V /F M ) and actual ( PSII ) quantum yield of photochemical processes in photosystem II in particular. In short-term treatments, the F 0 , F V and F M signals, as well as the values of F V /F M , and  PSII showed light-induced decrease, however substantial recovery after consequent 30 min. in dark. Longer exposition (60 min) to high light led to more pronounced decrease in chlorophyll fluorescence than after 30 min treatment, however dark recovery was faster in the thalli treated before for longer time (60 min). Long-term treatment by high light caused gradual decrease in F V /F M and  PSII with the time of exposition. The extent of the decrease was found light dose-dependent. The time course was biphasic for F V /F M but not for  PSII . The study showed that wet thalli of Usnea antarctica had high capacity of photoprotective mechanisms to cope well either with short-or long-term high light stress. This might be of particular importance in the field at the James Ross Island, particularly at the begining of growing season when melting water is available and, simultaneously, high light stress may happen on fully sunny days. 43

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Section: Introductionmentioning

confidence: 99%

Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II

Barták¹,

Hájek²,

Očenášová³

2012

Czech Polar Rep.

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“…This energy demanding and inconvenient`turnover' of the D 1 protein represents an inherent but unavoidable imperfection in PS II function. It is therefore not surprising that oxygenic photosynthetic organisms have developed a range of mechanisms to minimize the rate of damage of PS II especially under severe conditions such as high light intensities (Andersson & Barber 1996). One such mechanism is known as non-photochemical quenching (NPQ) whereby excess light is channelled into a heat-dissipating pathway (Horton et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Supermolecular structure of photosystem II and location of the PsbS protein

Nield

Funk

Barber

2000

Phil. Trans. R. Soc. Lond. B

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This paper addresses the question of whether the PsbS protein of photosystem two (PS II) is located within the LHC II^PS II supercomplex for which a three-dimensional structure has been obtained by cryoelectron microscopy and single particle analysis. The PsbS protein has recently been implicated as the site for non-photochemical quenching. Based both on immunoblotting analyses and structural considerations of an improved model of the spinach LHC II^PS II supercomplex, we conclude that the PsbS protein is not located within the supercomplex. Analyses of other fractions resulting from the solubilization of PS II-enriched membranes derived from spinach suggest that the PsbS protein is located in the LHC II-rich regions that interconnect the supercomplex within the membrane.

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“…When the electron cascade from the Mn cluster to P 680 is interrupted, light absorption could result in the creation of potentially damaging chemical species within PSII. Complex protection mechanisms exist in this protein, which are designed to minimise the photodamage induced by nonspeci¢c oxidation by P 680 (see [3] for review). Amongst these, it has been shown in particular that P 680 is able to obtain electrons from a series of electron donors other than Tyr z and these side-path reactions have been studied at low temperatures where their products can be accumulated under continuous illumination.…”

Section: Introductionmentioning

confidence: 99%

Fourier‐transform resonance Raman spectra of cation carotenoid in photosystem II reaction centres

et al. 1999

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Mechanisms of Photodamage and Protein Degradation During Photoinhibition of Photosystem II

Cited by 87 publications

References 121 publications

Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II

Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II

Supermolecular structure of photosystem II and location of the PsbS protein

Fourier‐transform resonance Raman spectra of cation carotenoid in photosystem II reaction centres

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