Growth response and drought susceptibility of sweetgum seedlings exposed to simulated acidic rain and ozone
Twelve-week-old sweetgum seedlings were exposed to ozone (O/sub 3/) at 0.00 (control) or 0.10 ppm, 4 hr/d, 3 d/wk in combination with simulated rain (pH 3.0 or 5.6, 1 hr/d, 2 d/wk at 0.75 cm/hr) for 10 wks. After treatment, all seedlings were submitted to two drought cycles. Leaf water potential, net photosynthesis (Pn), transpiration (Tr), stomatal conductance (Sc), root hydraulic conductivity (Lp) and plant biomass were measured. A significant increase in Lp occurred in plants exposed to rain at pH 3.0 compared to pH 5.6. However, no significant differences occurred between these treatments after drought stress. In contrast, 0.10 ppm O/sub 3/ did not significantly change Lp through the 10-wk-treatment, but drought stress reduced Lp in plants exposed to 0.10 ppm O/sub 3/ compared with controls. Shoot height growth was significantly increased by pH 3.0 rain treatment, however, root, shoot, and total dry weight were less in seedlings exposed to pH 3.0 rain compared with pH 5.6. There was no significant effects on Pn, Tr and Sc by pre-treatment with ozone and/or acidic rain.
- Research Organization:
- Virginia Polytechnic Institute and State Univ., Blacksburg
- OSTI ID:
- 6060276
- Report Number(s):
- CONF-8707108-
- Journal Information:
- Plant Physiol., Suppl.; (United States), Vol. 83:4; Conference: Annual meeting of the American Society of Plant Physiologists, St. Louis, MO, USA, 19 Jul 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ACID RAIN
BIOLOGICAL EFFECTS
OZONE
BIOMASS
DROUGHTS
HYDRAULIC CONDUCTIVITY
LEAVES
PHOTOSYNTHESIS
PLANT GROWTH
POTENTIAL ENERGY
ROOTS
SEEDLINGS
STOMATA
TRANSPIRATION
TREES
WATER
ATMOSPHERIC PRECIPITATIONS
CHEMICAL REACTIONS
ENERGY
ENERGY SOURCES
GROWTH
HYDROGEN COMPOUNDS
OPENINGS
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
RAIN
RENEWABLE ENERGY SOURCES
SYNTHESIS
560300* - Chemicals Metabolism & Toxicology
551000 - Physiological Systems