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For many plants, growth in elevated CO} leads to reduced rates of photosynthesis. To examine the role that leaf ontogeny plays in the acclimation response, we monitored photosynthesis and some related parameters at short intervals throughout the ontogenetic development of tobacco (Nicotiana tahacum L.) leaves under ambient (350 /iL L'') and high (950 )iL L'') CO, conditions. The pattern of photosynthetic rate over time was similar between the two treatments and consistent with the expected pattern for a typical dicot leaf. However, the photosynthesis pattern in high-C02-grown tobacco was shifted temporally to an earlier maximum and subsequent senescent decline. Ribulose-1,5bisphosphate carboxylase/oxygenase activity appeared to be the nuun factor regulating photosynthetic rates in both treatments. Therefore, we propose a new model for interpreting the acclimation response. Lowered photosynthetic rates observed during acclimation appear to be the result of a shift in the timing of the normal photosynthetic ' Department of Botany, Iowa State University, Ames, Iowa 50011 " Interdepartmental Plant Physiology Major, Iowa State UniversiQr, Ames, Iowa 5(X)11

Carbohydrate regulation of leaf development: Investigating the role of source strength, carbon partitioning and hexokinase signaling in regulating leaf senescence