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Science 6 March 1970:
Vol. 167. no. 3923, pp. 1376 - 1378
DOI: 10.1126/science.167.3923.1376
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Articles

Lead Effects on Corn Mitochondrial Respiration

David E. Koeppe 1 and Raymond J. Miller 1

1 Department of Agronomy, University of Illinois, Urbana 61801

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 percent depending on the reaction mediums, whereas lead chloride (12.5 micromoles per liter) inhibited succinate oxidation by more than 80 percent. 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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Microbial Uptake of Lead.
T. G. Tornabene and H. W. Edwards (1972)
Science 176, 1334-1335
   Abstract »    PDF »
Lead and Mercury Burden of Urban Woody Plants.
W. H. Smith (1972)
Science 176, 1237-1238
   Abstract »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)