The Constancy of the Buoyant Density of Chloroplast and Mitochondrial Deoxyribonucleic Acids in a Range of Higher Plants

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Abstract
A previous report (4) gave buoyant density values for chloro-plast and mitochondrial DNAs prepared from spinach, lettuce, broad bean, and sweet pea by the DNase technique, which takes advantage of the property of intact organelles to resist exogenous DNase action (3). With these higher plants, the buoyant densities of the chloroplast and mitochondrial DNAs fell into two distinct groups, with values centered around 1.697 and 1.706 g cm-3, respectively. It was felt, however, that this constancy could not be interpreted as significant since the densities of the nuclear DNAs of these plants were all in the range 1.694 to 1.695 g cm-3.