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|a 10.1007/s11120-012-9757-2
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|a Plant Sciences
100 1 _ |a Alter, P.
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245 _ _ |a Acclimatory responses of Arabidopsis to fluctuating light environment: comparison of different sunfleck regimes and accessions
260 _ _ |a Dordrecht [u.a.]
|b Springer Science + Business Media B.V
|c 2012
300 _ _ |a 221 - 237
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440 _ 0 |a Photosynthesis Research
|x 0166-8595
|0 14201
|y 1-3
|v 113
500 _ _ |a We thank Thomas Hombach, Andreas Averesch, and Siegfried Jahnke (Forschungszentrum Julich) for designing, constructing, and maintaining the sunfleck application system. Valuable comments on the manuscript as well as kind gift of seeds of Arabidopsis accessions by Maarten Koornneef (Max Planck Institute for Plant Breeding Research, Cologne) and the PsbS antiserum by Roberto Bassi (University of Verona, Verona) are much appreciated. P. A. and A. D. are grateful to Marcus Baumann (Aachen University of Applied Sciences, Aachen) for his support of the diploma theses. The work of F.-L. L. was supported by a PhD scholarship from the Deusche Akademische Austausch Dienst (DAAD).
520 _ _ |a Acclimation to fluctuating light environment with short (lasting 20 s, at 650 or 1,250 μmol photons m(-2) s(-1), every 6 or 12 min) or long (for 40 min at 650 μmol photons m(-2) s(-1), once a day at midday) sunflecks was studied in Arabidopsis thaliana. The sunfleck treatments were applied in the background daytime light intensity of 50 μmol photons m(-2) s(-1). In order to distinguish the effects of sunflecks from those of increased daily irradiance, constant light treatments at 85 and 120 μmol photons m(-2) s(-1), which gave the same photosynthetically active radiation (PAR) per day as the different sunfleck treatments, were also included in the experiments. The increased daily total PAR in the two higher constant light treatments enhanced photosystem II electron transport and starch accumulation in mature leaves and promoted expansion of young leaves in Columbia-0 plants during the 7-day treatments. Compared to the plants remaining under 50 μmol photons m(-2) s(-1), application of long sunflecks caused upregulation of electron transport without affecting carbon gain in the form of starch accumulation and leaf growth or the capacity of non-photochemical quenching (NPQ). Mature leaves showed marked enhancement of the NPQ capacity under the conditions with short sunflecks, which preceded recovery and upregulation of electron transport, demonstrating the initial priority of photoprotection. The distinct acclimatory responses to constant PAR, long sunflecks, and different combinations of short sunflecks are consistent with acclimatory adjustment of the processes in photoprotection and carbon gain, depending on the duration, frequency, and intensity of light fluctuations. While the responses of leaf expansion to short sunflecks differed among the seven Arabidopsis accessions examined, all plants showed NPQ upregulation, suggesting limited ability of this species to utilize short sunflecks. The increase in the NPQ capacity was accompanied by reduced chlorophyll contents, higher levels of the xanthophyll-cycle pigments, faster light-induced de-epoxidation of violaxanthin to zeaxanthin and antheraxanthin, increased amounts of PsbS protein, as well as enhanced activity of superoxide dismutase. These acclimatory mechanisms, involving reorganization of pigment-protein complexes and upregulation of other photoprotective reactions, are probably essential for Arabidopsis plants to cope with photo-oxidative stress induced by short sunflecks without suffering from severe photoinhibition and lipid peroxidation.
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|a Non-photochemical quenching Photoprotection
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|a Xanthophyll cycle
700 1 _ |a Dreissen, A.
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700 1 _ |a Luo, F.-L.
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700 1 _ |a Matsubara, S.
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773 _ _ |a 10.1007/s11120-012-9757-2
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