Metal-accelerated oxidation in plant cell death

Conference · Sat May 01 00:00:00 EDT 1993 · Plant Physiology; (United States)

OSTI ID:6028327

Czuba, M ^[1]

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1. National Research Council, Ottawa, Ontario (Canada)

Cadmium and mercury toxicity is further enhanced by external oxidizing conditions O[sub 3] or inherent plant processes. Lepidium sativum L, Lycopersicon esculentum Mill., or Phaseolus vulgaris L, were grown inpeat-lite to maturity under continuous cadmium exposure followed by one oxidant (O[sub 3]-6 hr. 30 pphm) exposure, with or without foliar calcium pretreatments. In comparison, Daucus carota, L and other species grown in a 71-V suspension, with or without 2,4-D were exposed continuously to low levels of methylmercury during exponential growth and analyzed in aggregates of distinct populations. Proteins were extracted and analyzed. Mechanisms of toxicity and eventual cell death are Ca-mediated and involve chloroplast, stomatal-water relations and changes in oxidant-anti-oxidant components in cells. Whether the metal-accelerated oxidative damage proceeds to cell death, depends on the species and its differential biotransformation system and cell association component.

• OSTI ID: 6028327
• Report Number(s): CONF-9307119--
• Journal Information: Plant Physiology; (United States), Journal Name: Plant Physiology; (United States) Vol. 102:1; ISSN 0032-0889; ISSN PLPHAY
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALKALINE EARTH METALS
BIOLOGICAL EFFECTS
CADMIUM
CALCIUM
CELL CONSTITUENTS
CHEMICAL REACTIONS
CHLOROPLASTS
ELEMENTS
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MERCURY
METALS
OPENINGS
OXIDATION
PHASEOLUS
PLANT CELLS
PLANTS
STOMATA
TOXICITY