ΔpH-dependent fluorescence quenching and its photoprotective role in the unicellular red alga Rhodella violacea

Title:

ΔpH-dependent fluorescence quenching and its photoprotective role in the unicellular red alga Rhodella violacea

Creator:

Ritz, M., Neverov, K. V., and Etienne, A.-L.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:1fc1bb0a-6ffb-4ed6-9ded-9dcca718ebd5
uuid:1fc1bb0a-6ffb-4ed6-9ded-9dcca718ebd5
issn:0300-3604
doi:10.1023/A:1007164207022

Subject:

chlorophyll irradiance, light-harvesting chlorophyll protein complex, photoinhibition, photosystems 1 and 2, and phycobilisome

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Plants have developed various photoprotective mechanisms to resist irradiation stress. One of the photoprotective mechanisms described in the literature for LHC2-containing organisms involves a down-regulation of photosystem (PS) 2 occurring simultaneously with the build-up of a proton gradient across the thylakoid membrane (ΔpH). It is often correlated with deepoxidation of xanthophylls located in LHC2. In Rhodophyta instead of LHC2, the peripheral antenna of PS2 consists of a large extramembrane complex, the phycobilisome (PBS), which transfers its excitation to the core antennae of PS2 composed of the CP43 and CP47 protein-chlorophyll complexes and there is no xanthophyll cycle. In the red alga Rhodella violacea a ΔpH-dependent chlorophyll (Chl) a fluorescence quenching can be formed. We characterised this quenching, studied the effects of various irradiances and inhibitors. Under photoinhibitory conditions, the ΔpH-dependent Chl fluorescence quenching exerts a photoprotective role and delays the kinetics of photoinhibition. It is the first time that such a photoprotective mechanism is described in PBS-containing organisms. and M. Ritz, K. V. Neverov, A.-L. Etienne.

Language:

Multiple languages

Rights:

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

Coverage:

267-280

Source:

Photosynthetica | 1999 Volume:37 | Number:2

Harvested from:

CDK

Metadata only:

false