DNA CONTENT, RIBOSOMAL-RNA GENE NUMBER, AND PROTEIN CONTENT IN SOYBEANS

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Abstract
Six cultivars [''Provar'', ''Pando'', ''Amsoy'', ''Wayne'', ''Sioux'' and ''Clark 63''] and 5 plant introductions of Glycine max L. Merr. varied in picograms of DNA per cell 1.84-2.61, and in number of rRNA genes per 2 C nucleus 960-2431 (Laboratory 1, Ames [Iowa, USA]) and 768-2095 (Laboratory 2, Rhinelander [Wisconsin]. The parameters did not correlate with seed protein content, which varied from 32.8% to 52.6%. With these materials, use of the rRNA locus size as a breeding tool for increasing percentage protein content by use of cytogenetic and genetic manipulations is not warranted.