Benomyl stimulation of peroxyacetyl nitrate injury to petunia
Petunia cv. white cascade seeds were germinated in vermiculite and transplanted to a steam treated 2:1 sand soil mixture. Twenty-four days after transplanting, a soil drench of 0, 60, 80, 100 or 120 ..mu..g benomyl/g soil was applied. Seven days later plants were exposed to 745 ..mu..g/m/sup 3/ (0.15 ppm) peroxyacetyl nitrate (PAN) for 1.5 h in a controlled environment chamber. The experiment was repeated twice with 10 plants per treatment per replicate. Percent foliar PAN injury per plant was evaluated 96 h after exposure. There was a statistically significant increase in PAN injury to plants treated with benomyl. Control plants exhibited 23% injury while plants treated with 60-120 ..mu..g benomyl/g soil sustained PAN injury on 35-39% of the foliage. A second set of experiments was conducted to determine the threshold concentration at which benomyl would stimulate PAN injury. Plants received benomyl treatments of 0, 20, 40, 60, 80, 100 and 120 ..mu..g/g soil and were exposed to PAN as before. This experiment was repeated 3 times with 10 plants per treatment per replicate. Benomyl stimulated PAN injury was again apparent. Control plants exhibited 41% foliar injury; plants which received 20, 40, 60, 80, 100, and 120 ..mu..g benomyl/g soil sustained 42, 42, 47, 46, 48, and 49% foliar injury respectively. The statistically significant threshold for benomyl stimulation of PAN injury was 60 ..mu..g/g soil. Since benomyl has been documented as an antisenescent, it may stimulate PAN injury by maintaining plants at the age of maximum sensitivity.
- Research Organization:
- Pennsylvania State Univ., University Park
- OSTI ID:
- 5483349
- Journal Information:
- Proc. Amer. Phytopathol. Soc.; (United States), Journal Name: Proc. Amer. Phytopathol. Soc.; (United States) Vol. 2; ISSN PAPSD
- 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.
ATMOSPHERES
BIOLOGICAL EFFECTS
CONTROLLED ATMOSPHERES
ESTERS
FUNGICIDES
INJURIES
LEAVES
NITRATES
NITRIC ACID ESTERS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORNAMENTAL PLANTS
OXYGEN COMPOUNDS
PEROXYACETYL NITRATE
PESTICIDES
PLANTS
RESPONSE MODIFYING FACTORS
TOXICITY