Influence of peroxyacetyl nitrate on stomatal conductance of primary bean leaves as it relates to macroscopic and microscopic symptom expression. [Phaseolus vulgaris L. cv]

Journal Article · Fri Dec 31 23:00:00 EST 1976 · Proc. Amer. Phytopathol. Soc.; (United States)

OSTI ID:6167593

Metzler, J T; Pell, E J

Phaseolus vulgaris L. cv. Provider seedlings were grown in sand culture in a controlled environment chamber. Six-day-old plants were exposed to one of the following dosages of PAN: 1) 271 ..mu..g/m/sup 3/ for 1 hr (subthreshold); 2) 405 ..mu..g/m/sup 3/ for 0.5 hr (subthreshold); 3) 405 ..mu..g/m/sup 3/ 1 hr (above threshold); and 4) 360 ..mu..g/m/sup 3/ for 1 hr (threshold). Exposures were conducted at 75% RH and 25 C beginning at 1100 hours. Stomatal conductance of primary leaves was measured at 1200 hours and 2100 hours on 3 consecutive days beginning one day prior to exposure. No macroscopic symptoms were observed on plants exposed to dosages 1 or 2 and stomatal conductance for these plants remained similar to that of controls. Typical abaxial glazing was observed at dosages 3 and 4 and stomatal conductance for these plants was higher at the 2100 hour reading each night after exposure and lower for the 1200 hour reading one day after exposure. An additional histological study was conducted on primary leaf tissue of plants exposed to dosage 3. Small numbers of abaxial epidermal and spongy mesophyll cells were plasmolized 3 hr after exposure. By 6 and 9 hr after exposure large but similar percentages of epidermal and mesophyll cells were collapsed. Greater numbers of cells adjacent to stomata were injured than at other locations. Guard cells remained intact and normal in appearance.

• Research Organization: Pennsylvania State Univ., University Park
• OSTI ID: 6167593
• Journal Information: Proc. Amer. Phytopathol. Soc.; (United States), Journal Name: Proc. Amer. Phytopathol. Soc.; (United States) Vol. 4; ISSN PAPSD
• 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 EFFECTS
ESTERS
HISTOLOGICAL TECHNIQUES
INJURIES
LEAVES
NITRATES
NITRIC ACID ESTERS
NITROGEN COMPOUNDS
OPENINGS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PEROXYACETYL NITRATE
STOMATA
SYMPTOMS