Photosynthetic CO 2 -Assimilation, Chlorophyll Fluorescence and Zeaxanthin Accumulation in Field Grown Maple Trees in the Course of a Sunny and a Cloudy Day
Journal of Plant Physiology, ISSN: 0176-1617, Vol: 148, Issue: 3, Page: 399-412
1996
- 108Citations
- 40Captures
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Article Description
Changes in photosynthetic CO 2 fixation, variable chlorophyll fluorescence ratios, carotenoid composition, zeaxanthin accumulation and the de-epoxidation state DEPS of the zeaxanthin cycle were simultaneously determined in leaves of field-grown maple trees ( Acer platanoides L.) on a sunny and a cloudy day in August. In the course of the sunny day the photosynthetic net CO 2 assimilation rates P N rose with the PPFD in the morning and were then predominantly determined by the stomata opening (partial closure at noon and further closure in the afternoon as seen from the decrease in gH 2 O-values). When the rate of CO 2 -fixation began to decrease at a high sun irradiance (high PPFD) at about 10:00 am (partial closure of stomata), large zeaxanthin amounts were accumulated in a biphasic process: 1) by a fast phototransformation of existing violaxanthin into zeaxanthin and 2) by a slow but continuous increase of the zeaxanthin level of 50 to 60 % via de novo biosynthesis. A strong zeaxanthin accumulation depends on a high proton gradient and only proceeded when P N was light-saturated and was reduced by a partial closure of stomata. The zeaxanthin accumulation in the morning followed the rise in PPFD with some delay as well as the zeaxanthin retransformation to violaxanthin at the PPFD decrease in the late afternoon and evening.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0176161796802720; http://dx.doi.org/10.1016/s0176-1617(96)80272-0; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0029843233&origin=inward; http://linkinghub.elsevier.com/retrieve/pii/S0176161796802720; http://api.elsevier.com/content/article/PII:S0176161796802720?httpAccept=text/xml; http://api.elsevier.com/content/article/PII:S0176161796802720?httpAccept=text/plain; https://linkinghub.elsevier.com/retrieve/pii/S0176161796802720; http://dx.doi.org/10.1016/s0176-1617%2896%2980272-0; https://dx.doi.org/10.1016/s0176-1617%2896%2980272-0
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