Dark respiration and carbohydrate status of two forest species grown in elevated carbon dioxide. [Liriodendron tulipifera L. ; Quercus alba L]

Conference · Wed May 01 00:00:00 EDT 1991 · Plant Physiology, Supplement; (United States)

OSTI ID:5518342

Wullschleger, S D; Norby, R J ^[1]; Hendrix, D L ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. Western Cotton Research Lab., Phoenix, AZ (United States)

Carbon assimilation is often increased by CO{sub 2} enrichment, but the response of dark respiration and carbohydrate metabolism to elevated CO{sub 2} is less well documented. The authors examined the diurnal response of these two processes in yellow-poplar (Liriodendron tulipifera L.) and white oak (Quercus alba L.) seedling exposed to CO{sub 2} enrichment under field conditions. One-year-old seedlings of yellow-poplar and white oak were grown in open-top chambers and exposed to ambient, +150 {mu}mol mol{sup {minus}1}, or +300 {mu}mol mol{sup {minus}1} CO{sub 2} concentrations. After 24 weeks, mature leaves of yellow-poplar and white oak seedlings grown at high CO{sub 2} showed a 37% and 52% reduction in nighttime respiration, respectively. Morning starch levels for yellow-poplar and white oak grown at +300 {mu}mol mol{sup {minus}1} increased 72% and 40%, respectively, compared to ambient-grown plants. Yellow-poplar and white oak seedlings grown at high CO{sub 2} contained 17% and 27% less morning sucrose, respectively than did plants grown at ambient CO{sub 2} concentration. Starch accumulation and the subsequent depletion of sucrose for plants grown under CO{sub 2} enrichment, resulted in a pronounced rise in the starch/sucrose ratio with increasing CO{sub 2} concentration. The diurnal pattern of dark respiration suggested that a relationship with carbohydrate status might exist.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5518342
• Report Number(s): CONF-9107184--
• Journal Information: Plant Physiology, Supplement; (United States), Journal Name: Plant Physiology, Supplement; (United States) Vol. 96:1; ISSN PPYSA; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110*
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CARBOHYDRATES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
DAILY VARIATIONS
EXPOSURE CHAMBERS
METABOLISM
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLANTS
RESPIRATION
TOXICITY
TREES
VARIATIONS