Growth and yield response of sweet potato to atmospheric CO/sub 2/ enrichment. [Ipomoea batatas]
Tuber growth of sweet potato (Ipomoea batatas) is a sink that may be limited by source capacity under present ambient CO/sub 2/ levels. Hence, sweet potato may demonstrate more response to predicted increases in atmospheric CO/sub 2/ than many other annual plants. The present investigation was undertaken to determine the long-term effects of CO/sub 2/ enrichment on some physiological parameters, growth, and yield, as well as on the source-sink relationship in sweet potato at different stages of growth. Plants of the cultivar Georgia Jet were grown in controlled environment chambers at 350, 675, and 1000 ..mu..L L/sup -1/ CO/sub 2/. The temperature was 28/sup 0/C during 14-h days and 20/sup 0/C during 10-h nights. The photosynthetic photon flux density was 550 ..mu..mol m/sup -2/ s/sup -1/. The length of main stem, total branch length, number of branches, and leaf area were increased for plants grown at 675 or 1000 ..mu..L L/sup -1/ CO/sub 2/. The production of total dry matter of plants increased at each harvest interval in response to CO/sub 2/ enrichment but it was greatest in 1000 ..mu..L L/sup -1/ CO/sub 2/. Specific leaf weight also increased with increased CO/sub 2/ concentration. The number and diameter of tubers increased at high CO/sub 2/ concentration. At the final harvest, the dry weight of roots and tubers increased 1.8 and 2.6 times in plants grown at 675 and 1000 ..mu..L L/sup -1/ CO/sub 2/, respectively, compared to those grown at 350 ..mu..L L/sup -1/ CO/sub 2/. Carbon dioxide enrichment resulted in the modulation of sink capacity to enhance the production of tubers in sweet potato.
- Research Organization:
- Tuskegee Institute, AL
- DOE Contract Number:
- AS05-83ER60166
- OSTI ID:
- 6384856
- Journal Information:
- Crop Sci.; (United States), Journal Name: Crop Sci.; (United States) Vol. 25:6; ISSN CRPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ATMOSPHERES
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROLLED ATMOSPHERES
DATA
DOSE-RESPONSE RELATIONSHIPS
EXPERIMENTAL DATA
GROWTH
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT GROWTH
SINKS
SYNTHESIS
TUBERS