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Plant and Cell Physiology Advance Access published online on December 15, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci244
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received October 28, 2005
Accepted December 11, 2005

Regular Paper

Effects of Elevated CO2 on the Capacity of Photosynthesis with a Single Leaf and a Whole Plant and on Growth in a Radish

Hideaki Usuda 1 *

1 School of Medicine, Teikyo University, 359 Ohtsuka, Hachioji, 192-0395, Japan

* To whom correspondence should be addressed.
Hideaki Usuda, E-mail: husuda{at}main.teikyo-u.ac.jp


  Abstract

The atmospheric concentration of CO2 will likely rise to about 700 µmol mol-1 by the end of this century. Effects of elevated growth CO2 on photosynthesis is still not fully understood. Effects of elevated growth CO2 on the capacity of photosynthesis with a single leaf and a whole plant were investigated with a radish cultivar of White Cherish. The plants were grown under ambient (ca. 400 µmol mol-1) or elevated CO2 (ca. 750 µmol mol-1). The rates of net photosynthesis per leaf area with a whole plant and a single leaf of variously aged plants (15 to 26 days after planting) were measured under ambient and elevated CO2. The rates of photosynthesis were increased by 20-28% by elevated CO2. There was no effect of elevated growth CO2 on the rate of photosynthesis clearly indicating no downward acclimation of photosynthesis to elevated CO2. Elevated CO2 increased dry weight accumulation by more than 27%. The effect of elevated CO2 on other growth characteristics will be also shown.

Keywords: elevated CO2; down-regulation of photosynthesis; radish.
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