Influence of time and pollutant concentration on the response of three deciduous tree species to ozone

Journal Article · Fri Jan 01 04:00:00 EST 1971 · Phytopathology; (United States)

OSTI ID:5195046

Kohut, R

The responses of tulip poplar (Liriodendron tulipifera), hybrid poplar (Populus N.E. maximowiezii x trichocarpa), and English oak (Quercus robur) to exposures of ozone were studied. A total of 280 trees from 2 to 5 years old with 10- to 11-week-old foliage were exposed to 10, 25, or 40 pphm ozone for 2, 4, 6, and 8 hr. All fumigations were conducted at 24C, 75% relative humidity, and 2400 ft-c. Evaluation of injury was made 5 days after exposure; all trees were compared with unexposed checks. Only slight injury was noted on 10-week-old foliage of tulip and hybrid poplars at 10 pphm. At 25 pphm, the degree of injury on tulip poplar was directly related to length of exposure. The injury at 8 hr was more than twice that at 4 hr. At 25 pphm, the amount of injury produced on hybrid poplar was directly related to exposure time through 6 hr; at 8 hr the injury decreased to the level observed at the 4-hr exposure. Eleven-week-old foliage of English oak, resistant at 25 pphm, showed injury at 40 pphm. Symptom severity increased through 6 hr of exposure and then diminished. This type of response has been observed by others and ascribed to stomatal closure.

• Research Organization: Pennsylvania State Univ., University Park
• OSTI ID: 5195046
• Journal Information: Phytopathology; (United States), Journal Name: Phytopathology; (United States) Vol. 61:2; ISSN PHYTA
• 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.
AGE DEPENDENCE
BIOLOGICAL EFFECTS
BIOLOGICAL FUNCTIONS
COMPARATIVE EVALUATIONS
DOSE-RESPONSE RELATIONSHIPS
FUNCTIONS
INJURIES
OAKS
OPENINGS
OZONE
PLANTS
POPLARS
RESPONSE MODIFYING FACTORS
STOMATA
TREES