Elevated temperature stimulates light-induced processes that contribute to protecting photosystem II against oxidative stress

0456341 - ÚVGZ 2016 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Materová, Z. - Štroch, Michal - Holubová, I. - Sestřenková, J. - Oravec, Michal - Večeřová, Kristýna - Špunda, Vladimír
Elevated temperature stimulates light-induced processes that contribute to protecting photosystem II against oxidative stress.
Global Change: A Complex Challenge : Conference Proceedings. Brno: Global Change Research Centre, The Czech Academy of Sciences, v. v. i., 2015 - (Urban, O.; Šprtová, M.; Klem, K.), s. 138-141. ISBN 978-80-87902-10-3.
[Global Change: A Complex Challenge /4th/. Brno (CZ), 23.03.2015-24.03.2015]
Grant CEP: GA MŠMT(CZ) LO1415; GA MŠMT(CZ) ED1.1.00/02.0073; GA ČR GA13-28093S
Institucionální podpora: RVO:67179843
Klíčová slova: plant species * Picea abies * temperatures ranging
Kód oboru RIV: BO - Biofyzika

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.
Trvalý link: http://hdl.handle.net/11104/0256899