Physiological and growth responses of differentially irrigated cotton to ozone (journal version)

Technical Report · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6277987

Temple, P J; Kupper, R S; Lennox, R L; Rohr, K

This study was conducted to determine the physiological and growth responses of cotton (Gossypium hirsutum L.) to the interaction of ozone (O/sub 3/) and drought stress. Cotton (cv SJ-2) was grown in open-top chambers in the field at three levels of soil water and exposed to charcoal-filtered air, nonfiltered air (NF), and NF x 1.25, and NF x 1.5 ambient O/sub 3/ concentrations in Riverside, CA from June to October 1986. Ozone-reduced carbon fixation an average of 74.6% in optimally watered (OW) plots, 63.4% in suboptimal (SO) plots, but only 19.3% in severely water-stressed (SS) plots. Leaf and stem biomass in OW and SO plots showed similar linear reductions in mass in response to increased O/sub 3/ concentrations, but SS plots showed no response to O/sub 3/ except at the highest O/sub 3/ treatment (seasonal 12-h O/sub 3/ mean of O-111 ppm 218 microgm(sup -3)). These results showed that moderately water-stressed cotton had similar physiological and growth responses to O/sub 3/ as well-watered plants, but severely water-stressed cotton showed little response to O/sub 3/ at ambient O/sub 3/ concentrations.

• Research Organization: Environmental Protection Agency, Corvallis, OR (USA). Environmental Research Lab.
• OSTI ID: 6277987
• Report Number(s): PB-89-144513/XAB; EPA-600/J-88/222
• Country of Publication: United States
• Language: English

Related Subjects

500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
BIOLOGICAL EFFECTS
BIOMASS
CARBON DIOXIDE FIXATION
CHEMICAL REACTIONS
COTTON PLANTS
DATA
DROUGHTS
ENERGY SOURCES
ENVIRONMENTAL IMPACTS
GROWTH
INFORMATION
IRRIGATION
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NUMERICAL DATA
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT GROWTH
PLANTS
POLLUTION
RENEWABLE ENERGY SOURCES
STATISTICAL DATA
SYNTHESIS