Role of the reversible xanthophyll cycle in the photosystem II damage and repair cycle in Dunaliella salina SCIE SCOPUS

Cited 47 time in WEB OF SCIENCE Cited 0 time in Scopus
Title
Role of the reversible xanthophyll cycle in the photosystem II damage and repair cycle in Dunaliella salina
Author(s)
Jin, ES; Yokthongwattana, K; Polle, JEW; Melis, A
Publication Year
2003-05
Abstract
The Dunaliella salina photosynthetic apparatus organization and function was investigated in wild type (WT) and a mutant (zea1) lacking all beta,beta-epoxycarotenoids derived from zeaxanthin (Z). The zeal mutant lacked antheraxanthin, violaxanthin, and neoxanthin from its thylakoid membranes but constitutively accumulated Z instead. It also lacked the so-called xanthophyll cycle, which, upon irradiance stress, reversibly converts violaxanthin to Z via a de-epoxidation reaction. Despite the pronounced difference observed in the composition of beta,beta-epoxycarotenoids between WT and zea1, no discernible difference could be observed between the two strains in terms of growth, photosynthesis, organization of the photosynthetic apparatus, photo-acclimation, sensitivity to photodamage, or recovery from photo-inhibition. WT and zeal were probed for the above parameters over a broad range of growth irradiance and upon light shift experiments (low light to high light shift and vice versa). A constitutive accumulation of Z in the zeal strain did not affect the acclimation of the photosynthetic apparatus to irradiance, as evidenced by indistinguishable irradiance-dependent adjustments in the chlorophyll antenna size and photosystem content of WT and zeal strain. In addition, a constitutive accumulation of Z in the zeal strain did not affect rates of photodamage or the recovery of the photosynthetic apparatus from photo-inhibition. However, Z in the WT accumulated in parallel with the accumulation of photodamaged PSII centers in the chloroplast thylakoids and decayed in tandem with a chloroplast recovery from photo-inhibition. These results suggest a role for Z in the protection of photodamaged and disassembled PSII reaction centers, apparently needed while PSII is in the process of degradation and replacement of the D1/32-kD reaction center protein.
ISSN
0032-0889
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5509
DOI
10.1104/pp.102.019620
Bibliographic Citation
PLANT PHYSIOLOGY, v.132, no.1, pp.352 - 364, 2003
Publisher
AMER SOC PLANT BIOLOGISTS
Subject
GREEN-ALGA DUNALIELLA; LIGHT-HARVESTING COMPLEX; CHLOROPHYLL ANTENNA SIZE; VIOLAXANTHIN DE-EPOXIDASE; ARABIDOPSIS-THALIANA; HIGHER-PLANTS; IRRADIANCE-STRESS; BETA-CAROTENE; IN-VIVO; PHOTOSYNTHETIC APPARATUS
Type
Article
Language
English
Document Type
Article
Publisher
AMER SOC PLANT BIOLOGISTS
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