Effects of SO/sub 2/ on stomatal metabolism in Pisum sativum L

Journal Article · Sat Jan 01 04:00:00 EST 1983 · Plant Physiol., Suppl.; (United States)

OSTI ID:6830409

Rao, I M; Amundson, R G; Alshcer-Herman, R; Anderson, L E

Pea (Pisum sativum L. cv 'Little Marvel') plants were exposed to SO/sub 2/ for short term (3 hours) and long term (2 days) at 0.2 and at 0.5 microliter per liter (ppm) levels. The effect of this treatment on the activity of phosphoenolpyruvate carboxylase, NAD- and NADP-malate dehydrogenases, and alanine aminotransferase from epidermis and whole leaves was investigated. Short-term exposure to SO/sub 2/ at 0.2 or 0.5 ppm decreased the activity of the carboxylase and the dehydrogenases in the epidermis. In contrast, the activity of the same three enzymes increased in whole leaves with either short- or long-term exposure to SO/sub 2/. Alanine aminotransferase in epidermis or whole leaves was not much affected by short-term exposure, but the epidermal activity was decreased and whole leaf activity was increased with long-term exposure. SO/sub 2/ exposure which was initiated prior to illumination decreased the free thiol content of both epidermis and of whole leaf. Net photosynthesis was reversibly inhibited by long-term exposure to SO/sub 2/ at 0.5 ppm. No effect of 0.5 ppm SO/sub 2/ on stomatal conductance was detectable after 3 hours. Stomatal conductance appeared to decrease after longer exposure times (2 days) at 0.5 ppm.

• Research Organization: Univ. of Illinois, Chicago
• OSTI ID: 6830409
• Journal Information: Plant Physiol., Suppl.; (United States), Journal Name: Plant Physiol., Suppl.; (United States) Vol. 72; ISSN PPYSA
• Country of Publication: United States
• Language: English

Related Subjects

553000 -- Agriculture & Food Technology
560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
60 APPLIED LIFE SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
FOOD
INHIBITION
KINETICS
LEGUMINOSAE
METABOLISM
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PEAS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PISUM
PLANTS
POLLUTION
REACTION KINETICS
STOMATA
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SYNTHESIS
VEGETABLES