Acclimation to high CO/sub 2/ in monoecious cucumbers. II. Carbon exchange rates, enzyme activities, and starch and nutrient concentrations. [Cucumis sativus L]
Carbon exchange capacity of cucumber (Cucumis sativus L.) germinated and grown in controlled environment chambers at 1000 microliters per liter CO/sub 2/ decreased from the vegetative growth stage to the fruiting stage, during which time capacity of plants grown at 350 microliters per liter increased. Carbon exchange rates (CERs) measured under growth conditions during the fruiting period were, in fact, lower in plants grown at 1000 microliters per liter CO/sub 2/ than those grown at 350. Progressive decreases in CERs in 1000 microliters per liter plants were associated with decreasing stomatal conductances and activities of ribulose bisphosphate carboxylase and carbonic anhydrase. Leaf starch concentrations were higher in 1000 microliters per liter CO/sub 2/ grown-plants than in 350 microliters per liter grown plants but calcium and nitrogen concentrations were lower, the greatest difference occurring at flowering. Sucrose synthase and sucrose-P-synthase activities were similar in 1000 microliters per liter compared to 350 microliters per liter plants during vegetative growth and flowering but higher in 350 microliters per liter plants at fruiting. The decreased carbon exchange rates observed in this cultivar at 1000 microliters per liter CO/sub 2/ could explain the lack of any yield increase when compared with plants grown at 350 microliters per liter.
- Research Organization:
- North Carolina State Univ., Raleigh
- OSTI ID:
- 5614999
- Journal Information:
- Plant Physiol.; (United States), Vol. 80:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM
CHEMICAL ANALYSIS
CARBON DIOXIDE
BIOLOGICAL EFFECTS
CUCUMBERS
BIOLOGICAL ADAPTATION
CARBON DIOXIDE FIXATION
ENZYME ACTIVITY
PLANT GROWTH
NITROGEN
STARCH
CARBONIC ANHYDRASE
CARBOXYLASE
EXPERIMENTAL DATA
EXPOSURE CHAMBERS
FLOWERS
GERMINATION
LEAVES
NUTRIENTS
PRODUCTIVITY
QUANTITY RATIO
RIBULOSE
SACCHAROSE
SEEDS
STOMATA
ALKALINE EARTH METALS
CARBOHYDRATES
CARBON COMPOUNDS
CARBON OXIDES
CARBON-CARBON LYASES
CARBON-OXYGEN LYASES
CARBOXY-LYASES
CHALCOGENIDES
DATA
DISACCHARIDES
ELEMENTS
ENZYMES
FOOD
GROWTH
HYDRO-LYASES
INFORMATION
KETONES
LYASES
METALS
MONOSACCHARIDES
NONMETALS
NUMERICAL DATA
OLIGOSACCHARIDES
OPENINGS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PENTOSES
PLANTS
POLYSACCHARIDES
REAGENTS
SACCHARIDES
VEGETABLES
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)