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Article
Osmotic Response of Sugar Beet Source Leaves at CO2Compensation Point
Plant Physiology
  • Theodore C. Fox
  • Donald R. Geiger, University of Dayton
Document Type
Article
Publication Date
1-1-1986
Abstract
As sugar beet source leaves lowered the CO2 concentration to compensation point in a closed atmosphere, leaf thickness and relative water content Dec.reased. Leaf water potential Dec.lined rapidly from −0.5 to −1.4 megapascals. At 340 microliters CO2 per liter, water potential and sucrose, glucose, and fructose contents were steady in photosynthesizing source leaves. Within 90 minutes after leaves were exposed to a CO2 concentration at the compensation point, leaf sucrose content Dec.lined to 60% of the preteatment level, rapidly in the first 30 minutes and then more slowly. During the subsequent 200 minutes, sucrose content increased to 180% of pretreatment level. Glucose and fructose remained unchanged during the treatment. Degradation of starch was sufficient to account for the additional sucrose that accumulated. Labeled carbon lost from starch appeared in sucrose and several other compounds that likely contributed to the recovery in leaf water content.
Inclusive pages
239-241
ISBN/ISSN
0032-0889
Publisher
American Society of Plant Biologists
Peer Reviewed
Yes
Disciplines
Citation Information
Theodore C. Fox and Donald R. Geiger. "Osmotic Response of Sugar Beet Source Leaves at CO2Compensation Point" Plant Physiology Vol. 80 (1986)
Available at: http://works.bepress.com/donald_geiger/30/