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The xanthophyll cycle pigments in Secale cereale leaves under combined Cd and high light stress conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
30409 44477 2008 6 PDF Available
Title
The xanthophyll cycle pigments in Secale cereale leaves under combined Cd and high light stress conditions
Abstract

Leaves of Secale cereale seedlings were exposed to high light illumination (1200 μmol m−2 s−1) and Cd ions at 5 or 50 μM concentrations. Influence of these stress factors on violaxanthin cycle pigments content was analysed chromatographically. Chlorophyll a fluorescence induction was used to analyse response of PSII to stress conditions and contribution of light-harvesting complex (LHCII) in non-photochemical quenching of excitation energy. The Cd-induced all-trans violaxanthin isomerization was analysed by HPLC technique in acetonitrile:methanol:water (72:8:3, v/v) solvent mixture. Interestingly, in the control and Cd-treated leaves subjected to high light, photochemical utilization of absorbed energy increased. This indicates plant adaptation to high light stress. In control plants high light caused zeaxanthin formation, however, the presence of Cd in the nutrient solution resulted in reduction of the second step of violaxanthin de-epoxidation process and anteraxanthin accumulation. In this study we have also shown, that non-photochemical quenching can be independent of anteraxanthin and zeaxanthin content. The particular increase in the cis isomers fraction in Cd-treated leaves has been explained in terms of a direct metal–pigment interaction as confirmed by Cd-induced all-trans violaxanthin isomerization in organic solvent, leading to formation of 13-cis, 9-cis and 15-cis isomers.

Keywords
Xanthophyll cycle; Cd; Heavy metal stress; Xanthophyll isomerization
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The xanthophyll cycle pigments in Secale cereale leaves under combined Cd and high light stress conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 90, Issue 1, 30 January 2008, Pages 47–52
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us