The Regulation of Rubisco Activity in Response to Variation in Temperature and Atmospheric CO2 Partial Pressure in Sweet Potato1[w]

From: Plant Physiology | Date: October 1, 2005| Author: | Copyright information

The temperature response of net CO2 assimilation rate (A), the rate of whole-chain electron transport, the activity and activation state of Rubisco, and the pool sizes of ribulose-1,5-bisphosphate (RuBP) and 3-phosphoglyceric acid (PGA) were assessed in sweet potato (Ipomoea batatas) grown under greenhouse conditions. Above the thermal optimum of photosynthesis, the activation state of Rubisco declined with increasing temperature. Doubling CO2 above 370 μbar further reduced the activation state, while reducing CO2 by one-half increased it. At cool temperature (<16°C), the activation ...

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