Carbon assimilation and export in sugar beet leaves. [Beta vulgaris]

Conference · Wed Apr 01 04:00:00 EST 1987 · Plant Physiol., Suppl.; (United States)

OSTI ID:6065286

Tucci, M A; Geiger, D K; Servaites, J C

Net carbon exchange rates (NCE), starch accumulation rates, gas exchange, and the maximum amount of carbon available for export were studied in Beta vulgaris L. following a 25% increase or a 25% decrease in ambient CO/sub 2/ (340 ..mu..l/L). Changing CO/sub 2/ by 25% above or below ambient had no effect on the ratio of internal CO/sub 2/ to ambient CO/sub 2/. Stomatal aperature adjusted in both cases to maintain the same relative stomatal limitation to NCE. Increasing CO/sub 2/ 25% increased NCE and water use efficiency, but slightly decreased stomatal conductance by 9% below leaves maintained at ambient. In contrast, a 25% reduction in CO/sub 2/ decreased NCE and water use efficiency. Decreasing CO/sub 2/ caused an increase in conductance also by 9%. Increasing CO/sub 2/ increased starch storage by 36%, but caused no change in the ratio of starch accumulation to NCE. A reduction in CO/sub 2/ caused a 60% decrease in the rate of starch storage and decreased the ratio of starch accumulation to NCE by one-half. The maximum amount of carbon available for export was increased 25% by increasing CO/sub 2/, but decreased by 5% following a reduction in CO2 level. These data are evidence that export rates are maintained at the expense of starch synthesis during periods of low NCE.

• Research Organization: Univ. of Dayton, OH
• OSTI ID: 6065286
• Report Number(s): CONF-8707108-
• Conference Information: Journal Name: Plant Physiol., Suppl.; (United States) Journal Volume: 83:4
• Country of Publication: United States
• Language: English

Related Subjects

550200 -- Biochemistry
551000 -- Physiological Systems
560300* -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BEETS
BIOLOGICAL EFFECTS
BIOLOGICAL FUNCTIONS
BIOSYNTHESIS
CARBOHYDRATES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
FOOD
FUNCTIONS
METABOLISM
OPENINGS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
POLYSACCHARIDES
REAGENTS
SACCHARIDES
STARCH
STOMATA
SUGAR BEETS
SYNTHESIS
TRANSLOCATION
VEGETABLES