Abstract
Estimations on nuclear DNA content, nuclear area and nuclear dry mass were made on 13 species of Crotalaria, with the help of Vicker's M 85 microdensitometer and Vicker's interferometer. Highly significant differences for all three characters were found between species. DNA density (DNA/area) increased with increase in DNA content. The cultivated species, C. juncea had a lower DNA density relative to its DNA content.—Nuclear DNA made only a small fraction of nuclear dry mass (1∶15). Although total dry mass and non-nucleolar nuclear dry mass showed significant regression on DNA content, the nucleolar dry mass gave a much wider scatter, indicating that nucleolar mass is not equally dependent on nuclear DNA content.
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