Home > Conference materials > Papers > Elevated temperature stimulates light-induced processes that contribute to protecting photosystem II against oxidative stress
Original title:
Elevated temperature stimulates light-induced processes that contribute to protecting photosystem II against oxidative stress
Authors:
Materová, Z. ; Štroch, Michal ; Holubová, I. ; Sestřenková, J. ; Oravec, Michal ; Večeřová, Kristýna ; Špunda, Vladimír Document type: Papers Conference/Event: Global Change: A Complex Challenge /4th/, Brno (CZ), 2015-03-23 / 2015-03-24
Year:
2015
Language:
eng Abstract:
We focused on elucidating the impact of elevated temperature on rapid induction of zeaxanthin (Z)- dependent photoprotection in two different plant species. The dynamics of violaxanthin (V) de-epoxidation under different illumination regimes was studied together with chlorophyll a fluorescence transients in Picea abies seedlings and Arabidopsis thaliana leaves pre-acclimated to temperatures ranging from 20 to 40°C. Whereas for spruce seedlings the rapid phase of V de-epoxidation (induced by either 10 s illumination or 10 light pulses 1 s in duration at 1 min intervals) was gradually stimulated upon increasing temperatures, for A. thaliana leaves considerable acceleration of V de-epoxidation occurred only at 40°C. Moreover, only for spruce seedlings was a considerable amount of Z accumulated after 10 × 1 s illumination. Elevated temperatures stimulated rapid formation of Z-dependent non-radiative dissipation of excitation energy within photosystem II (NRD) induced by 1 s light pulses only for spruce seedlings. The possible role of a specific fatty acid composition in spruce thylakoid membrane lipids in facilitated V de-epoxidation and NRD induction at elevated temperatures is discussed.
Keywords:
Picea abies; plant species; temperatures ranging Project no.: LO1415 (CEP), ED1.1.00/02.0073, GA13-28093S (CEP) Funding provider: GA MŠk, GA MŠk, GA ČR Host item entry: Global Change: A Complex Challenge : Conference Proceedings, ISBN 978-80-87902-10-3
Institution: Global Change Research Institute AS ČR
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Document availability information: Fulltext is available at the institute of the Academy of Sciences. Original record: http://hdl.handle.net/11104/0256899