Abstract
Mechanisms of adaptation of the photosynthetic apparatus at the level of pigment complex in a shade-tolerant bugle plant (Ajuga reptans L.) grown at full solar irradiation in an open plot were studied. In “sun” plants, the content of photosynthetic pigments decreased markedly as compared to “shade” plants grown under a forest canopy at 5–10% of the full solar irradiation. In leaves of sun plants, the portion of β-carotene and lutein in the carotenoid spectrum was higher than in shade plant leaves, antheraxanthin and zeaxanthin were present, and de-epoxidation of violaxanthin was by an order of magnitude higher in sun plant leaves reaching 40%. The data obtained indicate the role of the violaxanthin cycle in the protection of photosynthetic apparatus in a shade-tolerant plant against destruction under excessive irradiation.
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Abbreviations
- DEPS:
-
de epoxidation state of the violaxanthin cycle
- LHC:
-
light-harvesting complex
- NPQ:
-
nonphotochemical fluorescence quenching
- PAR:
-
photosynthetically active radiation
- SLW:
-
specific leaf weight
- VC:
-
violaxanthin cycle
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Original Russian Text © O.V. Dymova, T.K. Golovko, 2007, published in Fiziologiya Rastenii, 2007, Vol. 54, No. 1, pp. 47–53.
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Dymova, O.V., Golovko, T.K. Pigment apparatus in Ajuga reptans plants as affected by adaptation to light growth conditions. Russ J Plant Physiol 54, 39–45 (2007). https://doi.org/10.1134/S1021443707010062
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DOI: https://doi.org/10.1134/S1021443707010062