Effect of high CO/sub 2/ on growth and carbohydrate partitioning in pea (Pisum sativum L. ) plants

Conference · Tue Apr 01 04:00:00 EST 1986 · Plant Physiol., Suppl.; (United States)

OSTI ID:5089580

Potter, J R

Beginning at 10 days of age, pea plants were exposed to air with normal (350 ppm) or high (1200 ppm) CO/sub 2/ levels until the plants were 20 days old. Growth was exponential between 10 and 20 days regardless of CO/sub 2/ treatment, and relative growth rates (RGR) under normal and high CO/sub 2/ were 0.20 and 0.24 g x g/sup -1/ x day/sup -1/ respectively. Also high CO/sub 2/ stimulated net assimilation rates (NAR) about 34%. While high CO/sub 2/ did not affect partitioning of dry matter into root, stem, or leaf mass, it decreased the partitioning of new dry matter into new leaf area by 12%, hence the failure of high CO/sub 2/ to stimulate RGR as much as it stimulated NAR. This decrease in partitioning into new leaf area elicited by high CO/sub 2/ was due mainly to the continuous accumulation of leaf starch which reached nearly 3.0 mg x cm/sup -2/. However, this accumulation of starch was not associated with a decline in NAR or photosynthesis. Even for high CO/sub 2/ treatments, transport of photosynthate during photoperiods greatly exceeded the rate necessary to deplete leaf starch during the dark period, indicating that there is unused transport capacity.

• Research Organization: Dept. of Agriculture, Corvallis, OR
• OSTI ID: 5089580
• Conference Information: Journal Name: Plant Physiol., Suppl.; (United States) Journal Volume: 80:4
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
BIOLOGICAL ACCUMULATION
BIOLOGICAL EFFECTS
CARBOHYDRATES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
GROWTH
LEAVES
LEGUMINOSAE
MICROORGANISMS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PISUM
PLANT GROWTH
PLANTS
POLYSACCHARIDES
REAGENTS
RHIZOBIUM
SACCHARIDES
STARCH
STIMULATION