Oxidant injury to shade tobacco cultivars developed in Connecticut for weather fleck resistance
Thirteen tobacco (Nicotiana tabacum) cultivars developed by the cigar industry for resistance to weather fleck in Connecticut were tested at Beltsville, Maryland for their responses to air pollutants. Most of the improved cultivars showed significantly more resistance to ozone than AST-C (Bel-C), a cultivar no longer grown because of its susceptibility to weather fleck. Two-hour fumigations at 10 pphm ozone inflicted less than 10% injury on commercial cultivars. The same dosage injured about 20% of the leaf surfaces of Bel-C. The increase in leaf injury to the commercial cultivars was more pronounced between ozone rates of 15 and 20 pphm, compared to 10 and 15 pphm. Ozone used at 20 and 25 pphm produced about 25% injury on the two most resistant selections. The same rates destroyed 60 to 70% of the leaves of Bel-C. Weather fleck evaluations in the field disclosed that photochemical oxidants injured less than 3% of the leaf area of three commercial cultivars, but damaged 55% of the leaf surfaces of Bel-C. Improved cultivars displayed less than 20% fleck damage in the first and second harvests compared to 75% damage in the same two harvests of Bel-C. 12 references, 2 figures, 2 tables.
- OSTI ID:
- 5552985
- Journal Information:
- Agron. J.; (United States), Journal Name: Agron. J.; (United States) Vol. 64:2; ISSN AGJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
COMPARATIVE EVALUATIONS
CONNECTICUT
DOSE-RESPONSE RELATIONSHIPS
FEDERAL REGION I
INJURIES
LEAVES
NICOTIANA
NORTH AMERICA
OZONE
PHOTOCHEMICAL OXIDANTS
PLANTS
SENSITIVITY
USA
VARIATIONS