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.
Russian Journal of Plant Physiology – Springer Journals
Published: Jan 8, 2009
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