Activity of the photosynthetic apparatus at periodic elevation of CO₂ concentration

We studied the influence of prolonged (a few weeks) and short-term (a few hours) periodical elevation of the ambient CO₂ concentration ([Ca]) on the photosynthetic apparatus and carbohydrate content in the third leaf of three-week-old cucumber (Cucumis sativus L.) plants. On the basis of experimenta...

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Bibliographic Details
Published in:Russian journal of plant physiology 2009, Vol.56 (1), p.6-13
Main Author: Kosobryukhov, A. A
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
carbohydrates
CO₂ concentration
Cucumis sativus
Life Sciences
photosynthesis
Plant Physiology
Plant Sciences
Research Papers
ribulose-bisphosphate carboxylase
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Summary:We studied the influence of prolonged (a few weeks) and short-term (a few hours) periodical elevation of the ambient CO₂ concentration ([Ca]) on the photosynthetic apparatus and carbohydrate content in the third leaf of three-week-old cucumber (Cucumis sativus L.) plants. On the basis of experimental data and subsequent modeling, we revealed the limiting processes in the photosynthetic apparatus functioning: Rubisco activity, the rate of ribulose bisphosphate (CO₂ acceptor) regeneration, the rate of triose phosphate utilization in the Calvin cycle, and the influence of stomata on the photosynthesis rate. An increase in soluble carbohydrate content and a decrease in starch accumulation at a short-term [Ca] elevation indicate an important role of carbohydrate accumulation and their partition between organs in the regulation of the photosynthesis. We concluded that periodic [Ca] elevation can be used to improve plant productivity.
ISSN:1021-4437
1608-3407
DOI:10.1134/S1021443709010026