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- Title
Violaxanthin cycle pigment de-epoxidation and thermal dissipation of light energy in three boreal species of evergreen conifer plants.
- Authors
Yatsko, Ya.; Dymova, O.; Golovko, T.
- Abstract
We studied carotenoid composition and chlorophyll fluorescence in two-year-old needles from Siberian spruce ( Picea obovata (L.) Karst.), Siberian fir ( Abies sibirica L.), and common juniper ( Juniperus communis L.). The highest values of maximum PSII photochemical activity ( F/ F) equaling 0.82-0.85 were observed in July-September. The decrease in F/ F in December-March was more pronounced in juniper (down to 0.15) than in spruce and fir (0.45-0.50). In May, we observed a nearly complete recovery in maximum PSII photochemical activity in fir and spruce (0.72-0.77), while in juniper, the F/ F value was notably lower (0.65-0.67). The amount of thermal dissipation of energy absorbed by PSII LHC did not exceed 30% in summer and equaled 60-90% in winter and early spring. The carotenoid pool consisted mainly of xanthophylls, among which lutein (70%), neoxanthin (7-10%), and a violaxanthin cycle (VXC) component - violaxanthin (3-15%) were constantly present. The accumulation of two other VXC pigments-zeaxanthin and antheraxanthin, was noted in December-March. In July, these xanthophylls were not identified. We discovered a direct connection between VXC pigment de-epoxidation level and light energy thermal dissipation in boreal conifer leaves. Such association reflects the non-species-specific character of the mechanism for quenching zeaxanthin-dependent nonphotochemical chlorophyll fluorescence in PSII LHC in winter and spring.
- Subjects
PLANT pigments; PLANT species; CONIFERS; SIBERIAN spruce; JUNIPERUS communis; CAROTENOIDS; SPRUCE
- Publication
Russian Journal of Plant Physiology, 2011, Vol 58, Issue 1, p169
- ISSN
1021-4437
- Publication type
Article
- DOI
10.1134/S1021443711010249