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Effects of Kaempferol on the Oxidative Properties of Intact Plant Mitochondria

Patrick Ravanel, Michel Tissut and Roland Douce
Plant Physiology
Vol. 69, No. 2 (Feb., 1982), pp. 375-378
Stable URL: http://www.jstor.org/stable/4267211
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Kaempferol on the Oxidative Properties of Intact Plant Mitochondria
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Abstract

The effects of kaempferol on the oxidative and phosphorylative properties of plant mitochondria from potato tubers and etiolated mung bean (Phaseolus aureus Roxb.) hypocotyls were investigated. Kaempferol inhibited the state 3 oxidation rate of malate, NADH, and succinate, but was without effect on the ascorbate-tetramethyl p-phenylenediamine oxidation rate. The inhibition was almost the same whether the mitochondria were in state 3 or in an uncoupled state 3. When 180 micromolar kaempferol was added during state 4, the tight coupling of succinate or NADH oxidation was not released. The results obtained indicate that kaempferol inhibits the mitochondrial electron flow at, or just after, the flavoprotein site.

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