Xanthophyll cycle activity in detached barley leaves senescing under dark and light

Title:

Xanthophyll cycle activity in detached barley leaves senescing under dark and light

Creator:

Špundová, M., Strzałka, K., and Nauš, J.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:dd30944c-7e01-4560-8de0-9873076f16df
uuid:dd30944c-7e01-4560-8de0-9873076f16df
issn:0300-3604
doi:10.1007/s11099-005-7124-7

Subject:

ageing, carotenoids, chlorophyll fluorescence induction, de-epoxidation state, Hordeum vulgare, and photosystem 2

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Senescence-induced changes in the xanthophyll cycle activity and chlorophyll (Chl) fluorescence parameters were compared in detached barley (Hordeum vulgare L.) leaf segments kept for 6 d in darkness or under continuous " white light" (90 μmol m-2 s-1). Before detachment of the leaf segments, the plants were grown at periodic regime [12 h light (90 μmol m-2 s-1)/12 h dark]. The de-epoxidation state of the xanthophyll cycle pigments (DEPS) in the leaf samples was determined immediately (the actual DEPS), after 1 h of dark-adaptation (the residual DEPS), and during 14 min of a high-irradiance (HI) exposure (500 μmol m-2 s-1) (HI-induced DEPS). In the light-senescing segments, senescence was delayed pronouncedly compared to dark-senescing ones as the Chl content, the photosystem 2 photochemistry, and electron transport processes were highly maintained. Further, the actual DEPS increased, probably due to the increased mean photon dose. The HI-induced increase in the DEPS was stimulated in the light-senescing segments, whereas it was slowed down in the dark-senescing ones. However, after the 14 min HI-exposure of the dark-senescing segments the HI-induced DEPS was not markedly lower than in the mature leaves, which indicated the maintenance of the xanthophyll cycle operation. and M. Špundová, K. Strzałka, J. Nauš.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

117-124

Source:

Photosynthetica | 2005 Volume:43 | Number:1

Harvested from:

CDK

Metadata only:

false