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Distribution of Ribosomal Deoxyribonucleic Acid in Subcellular Fractions of Higher Plants ¹

^a Department of Botany, University of Georgia, Athens, Georgia 30602

Methods are described by which ribosomal DNA can be enriched in subcellular fractions of carrot and soybean. With both carrot and cucumber it was possible to obtain a distinct satellite DNA which contained the rDNA. Hybridization values greater than 0.49% were necessary before a satellite component was observed. Saturation hybridization values for soybean, carrot, and cucumber DNA were 0.2, 0.49, and 1.14%, respectively. These values were increased 1.6- and 2-fold in soybean and carrot, respectively, but enrichment was not obtained for cucumber.