Effects of ozone on the growth, yield, and partitioning of dry matter in cotton

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · J. Environ. Qual.; (United States)

DOI:https://doi.org/10.2134/jeq1979.00472425000800040007x· OSTI ID:5655458

Oshima, R J; Braegelmann, P K; Flagler, R B; Teso, R R

Cotton (Gossypium hirsutum L.) Alcala SJ-2 was grown in an activated carbon-filtered greenhouse and exposed to biweekly 6-hour ozone fumigations at a concentration of 490 ..mu..g m/sup -3/. Two ozone treatments were used, differing in age at initial exposure and total ozone dose. Sacrificial harvests were taken from all treatments at 14-day intervals to monitor plant response and to provide the basis for growth analysis techniques. Ozone reduced the vegetative growth and boll production in both ozone treatments. The dry weights of all partitioned plant parts were reduced with the largest reductions occurring in roots and bolls. Fumigated plants initially produced fewer leaves with significantly less leaf area. A period of stimulated leaf and branch production followed the initial growth depression. Boll production was depressed 48% in both ozone treatments. Mean relative growth rates of partitioned plant parts were extremely good predictors of absolute responses. Mean net assimilation rates of ozone-stressed plants were reduced throughout growth. The ozone-treated plants were characterized by larger mean leaf area ratios, which accounted for elevated plant mean relative growth rates at 64 days of age.

• Research Organization: Univ. of California, Riverside
• OSTI ID: 5655458
• Journal Information: J. Environ. Qual.; (United States), Journal Name: J. Environ. Qual.; (United States) Vol. 8:4; ISSN JEVQA
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL ACCUMULATION
BIOLOGICAL EFFECTS
BUILDINGS
COTTON PLANTS
DATA
DATA COMPILATION
DATA FORMS
GRAPHS
GREENHOUSES
GROWTH
INFORMATION
LEAVES
NUMERICAL DATA
OZONE
PLANT GROWTH
PLANTS
WEIGHT