Ozone injury on Bel W-3 tobacco controlled by at least two genes
Tobacco varieties differ widely in susceptibility to injury by ozone in polluted air. Ordinarily, this injury appears as small flecks on the upper surface of the leaf. The highly susceptible variety Bel W-3, commonly used as an indicator plant for ozone, develops both the flecking plus larger brown or white spots which interfere with the assessment of injury. The highly resistant breeding line 6524 develops no spots but only a few flecks under like conditions. The F/sub 1/ of Bel W-3 x 6524 is intermediate, showing flecks but fewer spots than Bel W-3. The F/sub 2/, however, segregated into 40% highly resistant, 10% highly susceptible, and 50% intermediate individuals. When exposed to ozone, resistant plants developed only a few small flecks, and susceptible plants responded as does Bel W-3. Among the plants in the intermediate group were individuals that formed only larger brown or white spots without fleck. Plants with the severe spot reaction showed injury on the calyx remnant surrounding the seed pod. Microbial infection was not involved. This is the first evidence that the severe symptoms of ozone injury on Bel W-3 are a combination of reactions controlled by at least two separate genes.
- Research Organization:
- Connecticut Agricultural Experiment Station Valley Lab., Windsor
- OSTI ID:
- 6296396
- Journal Information:
- Phytopathology; (United States), Journal Name: Phytopathology; (United States) Vol. 58; ISSN PHYTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
BIOLOGICAL VARIABILITY
BIOLOGY
CHLOROSIS
GENES
GENETIC VARIABILITY
GENETICS
LEAVES
NICOTIANA
OZONE
PATHOLOGICAL CHANGES
PLANTS
POLLUTION
SENSITIVITY
TOXICITY