Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 48:340-344 (1971)
© 1971 American Society of Plant Biologists

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Articles

Studies of Electron Transport in Dry and Imbibed Peanut Embryos 1

S. B. Wilson2 and Walter D. Bonner, Jr.

a Johnson Research Foundation, University of Pennsylvania, Philadelphia, Pennsylvania 19104

The respiration of isolated peanut (Arachis hypogea) embryos has been studied with dry and wet embryos and mitochondria prepared after various times of imbibition. Dry seeds respire slowly, apparently via a respiratory chain which is deficient in cytochrome c. Cytochrome c-deficient mitochondria have been prepared from the embryos up to 16 hours following imbibition. These mitochondria can metabolize reduced nicotinamide adenine dinucleotide and succinate, without respiratory control by ADP, but they do phosphorylate. Added cytochrome c increases both respiration and phosphorylation of these embryonic mitochondria. When growth starts, mitochondria appear which are similar to those isolated from other mature plant tissues; they have respiratory control and can actively metabolize succinate, malate, and reduced nicotinamide adenine dinucleotide. These latter mitochondria contain a concentration of cytochrome c comparable to that found in mitochondria isolated from other mature plant tissues. It is suggested that the earliest type of mitochondria may be required to control respiration in the dry and the recently wetted embryo.

2 Present address: Department of Biochemistry, University of Aberdeen, Aberdeen, AB9 1AS, Scotland.

1 This work was supported by a grant from the United States Atomic Energy Commission.




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O. Leprince and F. A. Hoekstra
The Responses of Cytochrome Redox State and Energy Metabolism to Dehydration Support a Role for Cytoplasmic Viscosity in Desiccation Tolerance
Plant Physiology, December 1, 1998; 118(4): 1253 - 1264.
[Abstract] [Full Text]


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Copyright © 1971 by the American Society of Plant Biologists