Journal of Experimental Botany, Vol 49, 1869-1879, Copyright © 1998 by Oxford University Press
B Logan, B Demmig-Adams, W Adams and S Grace
The acclimation of photochemistry, xanthophyll cycle-dependent energy
dissipation, and antioxidants was characterized in leaves of
Cucurbita pepo L. and Vinca major
L. that developed under photosynthetic photon flux densities (PPFDs)
ranging from deep shade to full sunlight in the field. The predominant
acclimatory response of leaf pigment composition was an increase in the
xanthophyll cycle pool size with increasing growth PPFD. In both species,
the estimated rate of thermal energy dissipation at midday increased with
increasing PPFD and midday levels of zeaxanthin and antheraxanthin per
chlorophyll were closely correlated with the levels of non-photochemical
fluorescence quenching under all growth PPFD regimes. However, at full
sunlight there appeared to be considerably higher levels of xanthophyll
cycle dependent energy dissipation in V. major
compared with pumpkin while estimated rates of photochemistry exhibited the
reverse trend. Leaf activities of the antioxidant enzymes ascorbate
peroxidase and superoxide dismutase, as well as ascorbate content,
increased with increasing growth PPFD in both plant species.
Activities/contents were higher under 100% full sunlight and increased more
strongly from intermediate growth PPFDs to 100% full sunlight in
V. major than in C. pepo. These
patterns of acclimation are similar to those exhibited by xanthophyll
cycle-dependent energy dissipation. The patterns of acclimation of
glutathione reductase are discussed in the context of the multiple roles
for reduced glutathione. Catalase acclimated in a manner consistent with
its role in scavenging H2O2 generated via photorespiration and/or
mitochondrial respiration. Leaf
ARTICLES
Antioxidants and xanthophyll cycle-dependent energy dissipation in Cucurbita pepo L. and Vinca major L. acclimated to four growth PPFDs in the field
Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder, CO 8039-0334, USA; Permanent address: Department of Biology, Bowdoin College, Brunswick, ME 04011, USA; Present address: Biodynamics Institute, 711, Choppin Hall, Louisiana State University, Baton Rouge, LA 70809, USA; Corresponding author e-mail: barbara.demmig-adams@colorado.edu
-tocopherol did not exhibit growth PPFD-dependent
trends.Key words: Antioxidation, Cucurbita
pepo, light acclimation, Vinca major,
xanthophyll cycle.
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