Lead effects on corn mitochondrial respiration

Journal Article · Fri Mar 06 04:00:00 EST 1970 · Science (Washington, D.C.); (United States)

DOI:https://doi.org/10.1126/science.167.3923.1376· OSTI ID:6308599

Koeppe, D E; Miller, R J

Oxidation of exogenous nicotinamide-adenine dinucleotide and succinate by corn mitochondria was measured as a function of lead chloride concentration. Lead chloride (50 to 62 micromoles per liter) stimulated oxidation of exogenous reduced nicotinamide-adenine dinucleotide by 174 to 640% depending on the reaction mediums, whereas lead chloride (12.5 micromoles per liter) inhibited succinate oxidation by more than 80%. When inorganic phosphate was included in reaction mediums the subsequent addition of lead was without effect due to the low solubility of lead phosphate. If addition of lead was followed by addition of phosphate the inhibition of succinate oxidation by lead was released, but there was no reduction in the stimulation of oxidation of reduced nicotinamide-adenine dinucleotide by lead. The effects of lead on plant growth might be accentuated under conditions of phosphate deficiency.

• Research Organization: Univ. of Illinois, Urbana
• OSTI ID: 6308599
• Journal Information: Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 167:3923; ISSN SCIEA
• Country of Publication: United States
• Language: English

Related Subjects

550500 -- Metabolism
560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CELL CONSTITUENTS
CEREALS
COMPARATIVE EVALUATIONS
ELEMENTS
GRASS
GROWTH
LEAD
MAIZE
METALS
MITOCHONDRIA
NONMETALS
NUTRIENTS
ORGANOIDS
PHOSPHORUS
PLANT GROWTH
PLANTS
RESPIRATION