Effects of ozone on carbon allocation and partitioning in loblolly pine seedlings

Conference · Wed May 01 04:00:00 EDT 1991 · Plant Physiology, Supplement; (United States)

OSTI ID:5599000

Tomlinson, P T ^[1]; Friend, A L ^[2]

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1. North Central Forest Experiment Station, Rhinelander, WI (United States)
2. Mississippi State Univ., Mississippi State (United States)

The effects of O{sub 3} on carbon allocation and partitioning were studied in two-year old loblolly pine (Pinus taeda L.) seedlings during the second season of exposure to charcoal-filtered air (CF) or twice-ambient levels of O{sub 3} (2X) in open-top chambers at Oak Ridge National Laboratory (Oak Ridge, TN). CF and 2X treatments were supplied from May to October in 1988 and 1989. Entire shoots were exposed to {sup 14}CO{sub 2} at times between Dec. 1988 and Aug. 1989: (1) during winter dormancy (no O{sub 3}), (2) just prior to spring bud burst (no O{sub 3}), and (3 and 4) during expansion of the first and third growth flushes (with O{sub 3}). Allocation and metabolism were most sensitive to ozonation in developing shoots. A greater amount of total plant {sup 14}CO{sub 2} was found in expanding buds and foliage of 2X-compared to CF-grown seedlings. More bud {sup 14}CO{sub 2} was partitioned into starch and a lower percentage into protein of 2X-compared to CF-grown seedlings. A greater percentage of foliage {sup 14}CO{sub 2} was found in starch and sugars of 2X-compared to CF-grown seedling. In general, O{sub 3} effects were greater during active shoot growth stages and few interactions between plant growth stage and O{sub 3} were identified. Allocation and metabolism of photosynthate within the plant was more strongly affected by stage of plant growth than by O{sub 3}.

• OSTI ID: 5599000
• Report Number(s): CONF-9107184--
• Conference Information: Journal Name: Plant Physiology, Supplement; (United States) Journal Volume: 96:1
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CARBON 14 COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CONIFERS
EXPOSURE CHAMBERS
GROWTH
LABELLED COMPOUNDS
LEAVES
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PINES
PINOPHYTA
PLANT GROWTH
PLANTS
SEEDLINGS
SYNTHESIS
TREES