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Start Over Descriptor "Light acclimation" Publisher springer netherlands
51 results on '"Light acclimation"'

41. Photoacclimation in Dunaliella tertiolecta reveals a unique NPQ pattern upon exposure to irradiance

Author

Jacco C. Kromkamp, Sven Soren Ihnken, John Beardall, and Marine Microbiology

Subjects
Chlorophyll, Carbonyl Cyanide m-Chlorophenyl Hydrazone, NPQ, Time Factors, Light, Dunaliella tertiolecta, Acclimatization, Irradiance, Plant Science, Photosynthesis, Photochemistry, Biochemistry, Fluorescence, chemistry.chemical_compound, Chlorophyll a fluorescence, Regular Paper, Microalgae, Connectivity, Photons, Quenching (fluorescence), Plant physiology, Photosystem II Protein Complex, Cell Biology, General Medicine, Photochemical Processes, Spectrometry, Fluorescence, chemistry, Light acclimation, qE, Constitutive NPQ, FRRF, Early phase
Abstract

Highly time-resolved photoacclimation patterns of the chlorophyte microalga Dunaliella tertiolecta during exposure to an off–on–off (block) light pattern of saturating photon flux, and to a regime of consecutive increasing light intensities are presented. Non-photochemical quenching (NPQ) mechanisms unexpectedly responded with an initial decrease during dark–light transitions. NPQ values started to rise after light exposure of approximately 4 min. State-transitions, measured as a change of PSII:PSI fluorescence emission at 77 K, did not contribute to early NPQ oscillations. Addition of the uncoupler CCCP, however, caused a rapid increase in fluorescence and showed the significance of qE for NPQ. Partitioning of the quantum efficiencies showed that constitutive NPQ was (a) higher than qE-driven NPQ and (b) responded to light treatment within seconds, suggesting an active role of constitutive NPQ in variable energy dissipation, although it is thought to contribute statically to NPQ. The PSII connectivity parameter p correlated well with F0, Fm 0 and NPQ during the early phase of the dark– light transients in sub-saturating light, suggesting a plastic energy distribution pattern within energetically connected PSII centres. In consecutive increasing photon flux experiments, correlations were weaker during the second light increment. Changes in connectivity can present an early photoresponse that are reflected in fluorescence signals and NPQ and might be responsive to the short-term acclimation state, and/or to the actinic photon flux.

Published
2011

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