High CO sub 2 concentration alters carbohydrate partitioning in favor of shoots in tomato
- North Carolina State Univ., Raleigh (United States)
Two tomato cultivars were grown under ambient (350 {mu}1 1{sup {minus}1})or elevated (1,000 {mu}1 1{sup {minus}1}) levels of CO{sub 2} for 15 weeks. Stem and leaf dry biomass was significantly increased under high CO{sub 2} conditions, whereas there was no difference in root biomass in either cultivar. Carbon exchange rate was not enhanced by high CO{sub 2} after an initial increase. Leaf starch was dramatically increased in the high CO{sub 2}-grown plants, along with significant increases in leaf hexose and sucrose. There were no differences in stem or root carbohydrate concentrations between CO{sub 2} treatments. Partitioning of carbohydrates was thus altered in favor of above ground biomass at the expense of roots under conditions of high CO{sub 2}. Leaf nitrogen concentrations are decreased in the high CO{sub 2}-grown plants, indicating that the lack of partitioning to roots may have detrimental effects on leaf photosynthetic capacity. Fruit size and number were increased at high CO{sub 2}, with the enlarged fruit being potential sinks for nutrients and carbohydrates at the expense of roots.
- OSTI ID:
- 5559391
- Report Number(s):
- CONF-9107184-; CODEN: PPYSA
- Journal Information:
- Plant Physiology, Supplement; (United States), Vol. 96:1; Conference: Annual meeting of the American Society of Plant Physiology, Albuquerque, NM (United States), 28 Jul - 1 Aug 1991; ISSN 0079-2241
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CARBON DIOXIDE
BIOLOGICAL EFFECTS
PLANT TISSUES
METABOLISM
CARBOHYDRATES
FRUITS
LEAVES
NITROGEN
PHOTOSYNTHESIS
PLANT GROWTH
PLANT STEMS
STARCH
TISSUE DISTRIBUTION
TOMATOES
BODY
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DISTRIBUTION
ELEMENTS
FOOD
GROWTH
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
POLYSACCHARIDES
REAGENTS
SACCHARIDES
SYNTHESIS
TISSUES
560300* - Chemicals Metabolism & Toxicology
540110