Journal
CANADIAN JOURNAL OF PLANT SCIENCE
Volume 94, Issue 6, Pages 1075-1083Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.4141/CJPS2013-151
Keywords
Carbon dioxide enrichment; productivity; photosynthesis; respiration; cereals; Brassicaceae
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Using four model plants, two members of the Gramineae, rye and wheat, and two Brassicaceae, Brassica napus and Arabidopsis thaliana, two fundamental approaches were exploited to determine how regulating source-sink development would alter photosynthesis, productivity and yield during long-term acclimation to elevated CO2. In one approach we exploited the cold acclimation response of winter wheat, rye and Brassica napus. In the other approach we modified the dark respiration in Arabidopsis thaliana to alter availability of respiratory substrates required for anabolic processes, such as fatty acid metabolism, thus reducing sink limitations on canopy phot osynthesis at elevated CO2. Taken together, the data show the importance of maintaining strong demand from active sinks when the aboveground canopy is being exposed to elevated levels of the primary substrate of photosynthesis, CO2.
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