Ferredoxin-quinone reductase benefits cyclic electron flow around photosystem 1 in tobacco leaves upon exposure to chilling stress under low irradiance

Title:

Ferredoxin-quinone reductase benefits cyclic electron flow around photosystem 1 in tobacco leaves upon exposure to chilling stress under low irradiance

Creator:

Li, X.-G., Xu, P.-L., Zhao, J.-P., Meng, J.-J., and He, Q.-W.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:27c309dd-e3db-4e8c-8c70-08de960c0394
uuid:27c309dd-e3db-4e8c-8c70-08de960c0394
issn:0300-3604
doi:10.1007/s11099-006-0035-4

Subject:

chlorophyll fluorescence, cyclic electron flow, ferrodoxin quinone reductase, Nicotiana, non-photochemical quenching, photosystem 2, and xanthophyll cycle

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The function of chloroplast ferredoxin quinone reductase (FQR)-dependent flow was examined by comparing a wild type tobacco and a tobacco transformant (ΔndhB) in which the ndhB gene had been disrupted with their antimycin A (AA)-fed leaves upon exposure to chilling temperature (4 °C) under low irradiance (100 µmol m-2 s-1 photon flux density). During the chilling stress, the maximum photochemical efficiency of photosystem (PS) 2 (Fv/Fm) decreased markedly in both the controls and AA-fed leaves, and P700+ was also lower in AA-fed leaves than in the controls, implying that FQR-dependent cyclic electron flow around PS1 functioned to protect the photosynthetic apparatus from chilling stress under low irradiance. Under such stress, non-photochemical quenching (NPQ), particularly the fast relaxing NPQ component (qf) and the de-epoxidized ratio of the xanthophyll cycle pigments, (A+Z)/(V+A+Z), formed the difference between AA-fed leaves and controls. The lower NPQ in AA-fed leaves might be related to an inefficient proton gradient across thylakoid membranes (ΔpH) because of inhibiting an FQR-dependent cyclic electron flow around PS1 at chilling temperature under low irradiance. and X.-G. Li ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

349-354

Source:

Photosynthetica | 2006 Volume:44 | Number:3

Harvested from:

CDK

Metadata only:

false