Inhibition of foliar respiration in ozone-exposed Pinto bean plants

Journal Article · Sat Jan 01 04:00:00 EST 1972 · Phytopathology; (United States)

OSTI ID:5518304

Ripaldi, C P; Brennan, E; Leone, I A

A frequent and early symptom of ozone toxicity in Pinto bean (Phaseolus vulgaris) following fumigation (0.30-.035 ppm O/sub 3//3-4 hr) is water-soaking of the foliage. After 24 hr, characteristic necrotic stipple or bleaching develops. The authors found a significant inhibition of respiration concurrent with the water-soaking (control 2.62 and O/sub 3/ 1.89 ..mu..liters O/sub 2//mg dry wt per hr). This contrasts with the increased respiration rate that accompanies visible injury. Macdowall also reported an inhibition of respiration prior to the occurrence of necrosis, and subsequent stimulation with necrosis. Vacuum infiltration of healthy bean foliage with water also decreased respiration, but the inhibition was not of the magnitude found in ozonated tissue; nor was the external symptom the same under both conditions. Replacing ambient air with 100% O/sub 2/ in the Gilson respirometer flasks increased the rate of the ozonated bean foliage to that of the controls (control, 2.31 and O/sub 3/, 1.64 ..mu..liters/mg dry wt per hr; control + 100% O/sub 2/, 2.72 and O/sub 3/ + 100% O/sub 2/, 2.40 ..mu..liters O/sub 2//mg dry wt per hr). These data support the hypothesis that O/sub 2/ diffusion was limited in the early stages of ozone damage.

• Research Organization: Rutgers Univ., New Brunswick, NJ
• OSTI ID: 5518304
• Journal Information: Phytopathology; (United States), Journal Name: Phytopathology; (United States) Vol. 62:5; 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.
AIR POLLUTION
ELEMENTS
HYDROGEN COMPOUNDS
INHIBITION
INJURIES
LEAVES
LEGUMINOSAE
NECROSIS
NONMETALS
OXYGEN
OXYGEN COMPOUNDS
OZONE
PATHOLOGICAL CHANGES
PHASEOLUS
PLANTS
POLLUTION
RESPIRATION
TOXICITY
WATER