Detoxification of SO sub 2 by apoplastic enzymes

Conference · Tue May 01 04:00:00 EDT 1990 · Plant Physiology, Supplement; (USA)

OSTI ID:5628858

Pfanz, H ^[1]

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1. Lehrstuhl fuer Botanik II, Wuerzburg (West Germany)

When taken up by leaves, SO{sub 2} can affect various sites like biomembranes or enzymes, and may cause intracellular acidification. It is known that plants are capable of detoxifying SO{sub 2} in different cell organelles by oxidation or reductive metabolization and thereby decrease of even avoid damage. Detoxification via oxidation also takes place in the aqueous phase of the cell wall. Fumigation of leaves with SO{sub 2} resulted in an increase in the amount of extractable soluble cell wall peroxidase. We have isolated soluble and cell wall bound peroxidases from barley leaves and spruce needles, both of which are capable of oxidizing sulfite to sulfate in vitro and in situ (ca. 2 {mu}mol SO{sub 3}{sup 2{minus}} oxidized mg{sup {minus}1} Chl and h). To what extent this process contributes to the overall detoxification of leaves to SO{sub 2} is not known at present.

• OSTI ID: 5628858
• Report Number(s): CONF-9007196--
• Conference Information: Journal Name: Plant Physiology, Supplement; (USA) Journal Volume: 93:1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110
550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
BARLEY
BIOCHEMICAL REACTION KINETICS
CELL CONSTITUENTS
CEREALS
CHALCOGENIDES
CONIFERS
DETOXIFICATION
ENZYME ACTIVITY
GRAMINEAE
KINETICS
LILIOPSIDA
MAGNOLIOPHYTA
ORGANOIDS
OXIDES
OXYGEN COMPOUNDS
PINOPHYTA
PLANTS
REACTION KINETICS
SPRUCES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TREES