Journal Article

Effects of Elevated CO<sub>2</sub> on the Capacity for Photosynthesis of a Single Leaf and a Whole Plant, and on Growth in a Radish

Hideaki Usuda

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 2, pages 262-269
Published in print February 2006 | ISSN: 0032-0781
Published online February 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pci244
Effects of Elevated CO2 on the Capacity for Photosynthesis of a Single Leaf and a Whole Plant, and on Growth in a Radish

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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The atmospheric concentration of CO2 will probably rise to about 700 µmol mol–1 by the end of this century. The effects of elevated growth CO2 on photosynthesis are still not fully understood. Effects of elevated growth CO2 on the capacity for photosynthesis of a single leaf and a whole plant were investigated with the radish cultivar White Cherish. The plants were grown under ambient (∼400 µmol mol–1) or elevated CO2 (∼750 µmol mol–1). The rates of net photosynthesis per leaf area with a whole plant and a single leaf of plants of various ages (15–26 d 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 >27%. The effect of elevated CO2 on other growth characteristics will also be shown.

Keywords: Down-regulation of photosynthesis; Elevated CO2; Radish; DAP, days after planting; FACE, free-air CO2 enrichment; HL, high light; LA, leaf area; LAR, leaf area ratio; LWR, leaf weight ratio; ML, medium light; NAR, net assimilation rate; RGR, relative growth rate; SLA, specific leaf area

Journal Article.  7353 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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