Osmotic adjustment in five tree species under elevated CO sub 2 and water stress. [Platanus occidentalis L. ; Liquidambar styraciflua L. ; Quercus rubra L. ; Acer saccharum Marsh; Liriodendron tulipifera L]
- Oak Ridge National Lab., TN (United States)
- Pennsylvania State Univ., University Park (United States)
Since osmotic adjustment to water stress requires carbon assimilation during stress, the stimulation of photosynthesis by elevated CO{sub 2} may enhance osmotic adjustment. Osmotic adjustment of American sycamore (Platanus occidentalis L.), sweetgum (Liquidambar styraciflua L.), sugar maple (Acer saccharum Marsh.), yellow-poplar (Liriodendron tulipifera L.), and northern red oak (Quercus rubra L.) to water stress was assessed under ambient and elevated CO{sub 2} (ambient +300 {mu}L L{sup {minus}1}), with seedlings grown in 8-L pots in four open-top chambers, fitted with rain exclusion canopies. Trees were subjected to repeated water stress cycles over a six-week period. Well-watered trees were watered daily to maintain a soil matric potential > {minus}0.3 MPa, whereas stressed trees were watered when soil matric potential declined to < {minus}0.9 MPa. Gas exchange and water relations were monitored at the depth of stress and after rewatering. All species displayed an increase in leaf-level water-use efficiency (net photosynthesis/transpiration). Leaves of sycamore and sweetgum displayed an adjustment in osmotic potential at saturation (pressure-volume analysis) of 0.3 MPa and 0.6 MPa, respectively. Elevated CO{sub 2} did not enhance osmotic adjustment in leaves of any of the species studied. Studies to characterize organic solute concentrations in roots are ongoing to determine if osmotic adjustment occurred in the roots.
- OSTI ID:
- 5559252
- 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
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Related Subjects
540210 -- Environment
Terrestrial-- Basic Studies-- (1990-)
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DIFFUSION
DROUGHTS
ENVIRONMENTAL EFFECTS
EXPOSURE CHAMBERS
OSMOSIS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
SEEDLINGS
SYNTHESIS
TREES