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Temperature-sensitive coupling and uncoupling of ATPase-mediated, nonradiative energy dissipation: Similarities between chloroplasts and leaves

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Abstract

The effects of temperature on the dark relaxation kinetics of nonradiative energy dissipation in photosystem II were compared in lettuce (Lactuca sativa L.) chloroplasts and leaves of Aegialitis annulata R. Br. After high levels of violaxanthin de-epoxidation in the light, Aegialitis leaves showed a marked delay in the dark relaxation of nonradiative dissipation, measured as non-photochemical quenching (NPQ) of photosystem II chlorophyll a fluorescence. Aegialitis leaves also maintained a moderately high adenylate energy charge at low temperatures during and after high-light exposure, presumably because of their limited carbon-fixation capacity. Similarly, dark-sustained NPQ could be induced in lettuce chloroplasts after de-epoxidizing violaxanthin and light-activating the ATP synthase. The duration and extent of dark-sustained NPQ were strongly enhanced by low temperatures in both chloroplasts and leaves. Further, the NPQ sustained at low temperatures was rapidly reversed upon warming. In lettuce chloroplasts, low temperatures sharply decreased the ATP-hydrolysis rate while increasing the duration and extent of the resultant trans-thylakoid proton gradient that elicits the NPQ. This was consistent with a higher degree of energy-coupling, presumably due to reduced proton diffusion through the thylakoid membrane at the lower temperatures. The chloroplast adenylate pool was in equilibrium with the adenylate kinase and therefore both ATP and ADP contributed to reverse coupling. The low-temperature-enhanced NPQ quenched the yields of the dark level (Fo) and the maximal (Fm) fluorescence proportionally in both chloroplasts and leaves. The extent of NPQ in the dark was inversely related to the efficiency of photosystem II, and very similar linear relationships were obtained over a wide temperature range in both chloroplasts and leaves. Likewise, the dark-sustained absorbance changes, caused by violaxanthin de-epoxidation (A508nm) and energy-dependent light scattering (A536nm) were strikingly similar in chloroplasts and leaves. Therefore, we conclude that the dark-sustained, low-temperature-stimulated NPQ in chloroplasts and leaves is apparently directly dependent on lumen acidification and chloroplastic ATP hydrolysis. In leaves, the ATP required for sustained NPQ is evidently provided by oxidative phosphorylation in the mitochondria. The functional significance of this quenching process and implications for measurements of photo-protection versus photodamage in leaves are discussed.

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Abbreviations

A:

antheraxanthin

Chl:

chlorophyll

DPS:

de-epoxidation state of the xanthophyll cycle, ([Z+A]/[V+A+Z])

F, F′:

steady-state fluorescence in the absence, presence of thylakoid energization

Fo, F′o :

dark fluorescence level in the absence, presence of thylakoid energization

Fm, F′m :

maximal fluorescence in absence, presence of thylakoid energization

NPQ:

nonphotochemical quenching (Fm/F′m)−1

V:

violaxanthin

Z:

zeaxanthin

NRD:

nonradiative dissipation

PFD:

photon flux density

ɛ:

[2ATP+ADP]

ΔpH:

trans-thylakoid proton gradient

ΔS:

ΔpH-dependent light scattering

ΦPSII :

(Fm−F′)/F′m, photon yield of PSII photochemistry at the actual reduction state in the light or dark

Σ:

[ATP+ADP+AMP]

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We thank Connie Shih for skillful assistance in growing plants and for conducting HPLC analyses. Support from an NSF/USDA/DOE postdoctoral training grant to A.G. is gratefully acknowledged. A.G. also wishes to thank Prof. Govindjee for valuable discussions. C.I.W.-D.P.B. Publication No. 1197.

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Gilmore, A.M., Björkman, O. Temperature-sensitive coupling and uncoupling of ATPase-mediated, nonradiative energy dissipation: Similarities between chloroplasts and leaves. Planta 197, 646–654 (1995). https://doi.org/10.1007/BF00191573

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