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Presence of state t...
Presence of state transitions in the cryptophyte alga Guillardia theta
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- Cheregi, Otilia (författare)
- Umeå universitet,Kemiska institutionen
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Kotabová, Eva (författare)
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Prášil, Ondřej (författare)
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- Schröder, Wolfgang P (författare)
- Umeå universitet,Kemiska institutionen
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Kaňa, Radek (författare)
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- Funk, Christiane (författare)
- Umeå universitet,Kemiska institutionen
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(creator_code:org_t)
- 2015-08-06
- 2015
- Engelska.
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Ingår i: Journal of Experimental Botany. - : Oxford University Press. - 0022-0957 .- 1460-2431. ; 66:20, s. 6461-6470
- Relaterad länk:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Plants and algae have developed various regulatory mechanisms for optimal delivery of excitation energy to the photosystems even during fluctuating light conditions; these include state transitions as well as non-photochemical quenching. The former process maintains the balance by redistributing antennae excitation between the photosys-tems, meanwhile the latter by dissipating excessive excitation inside the antennae. In the present study, these mecha-nisms have been analysed in the cryptophyte alga Guillardia theta. Photoprotective non-photochemical quenching was observed in cultures only after they had entered the stationary growth phase. These cells displayed a diminished overall photosynthetic efficiency, measured as CO2 assimilation rate and electron transport rate. However, in the logarithmic growth phase G. theta cells redistributed excitation energy via a mechanism similar to state transitions. These state transitions were triggered by blue light absorbed by the membrane integrated chlorophyll a/c antennae, and green light absorbed by the lumenal biliproteins was ineffective. It is proposed that state transitions in G. thetaare induced by small re-arrangements of the intrinsic antennae proteins, resulting in their coupling/uncoupling to the photosystems in state 1 or state 2, respectively. G. theta therefore represents a chromalveolate algae able to perform state transitions.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- Blue/low light adaptation
- chlorophyll a/c antenna
- cryptophytes
- growth stage
- non-photochemical quenching
- state transitions
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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