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. 1987 Aug;84(4):1385–1390. doi: 10.1104/pp.84.4.1385

Pontentiometric Cyanine Dyes Are Sensitive Probes for Mitochondria in Intact Plant Cells 1

Kinetin Enhances Mitochondrial Fluorescence

Zhanjiang Liu 1,2,3, W R Bushnell 1,2,3, Robert Brambl 1,2,3
PMCID: PMC1056783  PMID: 16665615

Abstract

Selected fluorescent dyes were tested for uptake by mitochrondria in intact cells of barley, maize, and onion. The cationic cyanine dye 3,3′-diheptyloxacarbocyanine iodide [DiOC7(3)] accumulated in mitochondria within 15 to 30 minutes without appreciable staining of other protoplasmic constituents. The number, shape, and movement of the fluorescent mitochondria could be seen readily, and the fluorescence intensity of the mitochondria could be monitored with a microscope photometer. Fluorescence was eliminated in 1 to 5 minutes by the protonophore carbonyl cyanide m-chlorophenylhydrazone (CCCP) indicating that maintenance of dye concentration was dependent on the inside-negative transmembrane potential maintained by functional mitochondria. Fluorescence of prestained mitochondria was enhanced within 5 to 10 minutes after addition of 0.1 millimolar kinetin to cells. The fluorescence in kinetintreated cells was dissipated by CCCP. These results suggest that kinetin interacted with respiratory processes resulting in higher potential across the mitochondrial membrane.

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