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Abscisic acid induced protection against photoinhibition of PSII correlates with enhanced activity of the xanthophyll cycle
Author(s) -
Ivanov A.G.,
Krol M.,
Maxwell D.,
Huner N.P.A.
Publication year - 1995
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(95)00872-7
Subject(s) - violaxanthin , antheraxanthin , xanthophyll , photoinhibition , abscisic acid , zeaxanthin , non photochemical quenching , chemistry , quenching (fluorescence) , photoprotection , lutein , carotenoid , photochemistry , botany , photosynthesis , photosystem ii , biology , biochemistry , fluorescence , physics , quantum mechanics , gene
The exogenous application of abscisic acid (ABA) to barley seedlings resulted in partial protection of the PSII photochemistry against photoinhibition at low temperature, the effect being most pronounced at 10 −5 M ABA. This was accompanied by higher photochemical quenching (qP) in ABA‐treated leaves. A considerable increase (122%) in the amount of total carotenoids and xanthophylls (antheraxanthin, violaxanthin and zeaxanthin) was also found in the seedlings subjected to ABA. The activity of the xanthophyll cycle measured by the epoxidation state of xanthophylls under high‐light treatment was higher in ABA‐treated plants compared with the control. This corresponds to a higher value (0.411) of non‐photochemical quenching (qNP) observed in ABA‐treated than in control (0.306) leaves.