Contrasting changes of photosystem 2 efficiency in Arabidopsis xanthophyll mutants at room or low temperature under high irradiance stress

Title:

Contrasting changes of photosystem 2 efficiency in Arabidopsis xanthophyll mutants at room or low temperature under high irradiance stress

Creator:

Peng, Chang-Lian and Gilmore, A. M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:02726a11-629b-4a75-b50a-5831e0c921de
uuid:02726a11-629b-4a75-b50a-5831e0c921de
issn:0300-3604
doi:10.1023/B:PHOT.0000011956.29950.97

Subject:

antheraxanthin, β-carotene, chlorophyll, fluorescence, light-harvesting complex, lutein, neoxanthin, violaxanthin, and zeaxanthin

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We compared the responses of wild type (WT) and three mutants including npq1 (lutein-replete and violaxanthin deepoxidase-deficient), lut2 (lutein-deficient), and lut2-npq1 (double mutant) to high irradiance (HI, 2 000 μmol m-2 s-1) at both low (LT, 5 °C) and room (25 °C) temperature. Xanthophyll-dependent energy dissipation was highest in the WT, followed by the lut2, npq1, and npq1-lut2. At 25 °C the relative stress tolerance expressed by Fv/Fm was consistent with the energy dissipation capacity for the first 2 h of treatment. After 3-4 h, the Fv/Fm levels in lut2 and npq1 converged. Under combined LT and HI the relative tolerance sequence was in contrast to the energy dissipation capacity being WT > npq1> lut2 > lut2-npq1. There were little or no significant change in the contents of xanthophylls and carotenes or the chlorophyll (Chl) a/b ratio in any of the materials. Thus lutein (L) substitution possibly alters the conformation/organisation of L binding proteins to enhance damage susceptibility under HI at LT. The enhanced vulnerability is not compensated for the energy dissipation capacity in the lut2 background at LT. and Chang-Lian Peng, A. M. Gilmore.

Language:

Multiple languages

Rights:

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

Coverage:

233-239

Source:

Photosynthetica | 2003 Volume:41 | Number:2

Harvested from:

CDK

Metadata only:

false