期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 66, 期 20, 页码 6461-6470出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erv362
关键词
Blue; low light adaptation; chlorophyll a; c antenna; cryptophytes; growth stage; non-photochemical quenching; state transitions
资金
- Swedish Energy Agency [2012-005889]
- Umea University
- Artificial Leaf and Solar Fuel Project [KAW 2011-0055]
- Czech Science Foundation [GACR P501/12/G055, GACR P501/12/0304]
- Czech Ministry of Education, Youth and Sport [CZ.1.05/2.1.00/03.0110, MSMT LO1416]
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 photosystems, meanwhile the latter by dissipating excessive excitation inside the antennae. In the present study, these mechanisms 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. theta are 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.
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