Abstract
The rates of increase in DNA, RNA and fresh weight were determined for a series of stages of cotyledon development in three varieties of Pisum sativum. The average amounts of DNA in the cells of the cotyledon (up to 64C) were directly proportional to the average weights of the cells for the whole of the period of development in the case of two-seeded varieties, and for the first part of the developmental period for the large-seeded variety. Increases in RNA values for all three varieties were proportional to cell weight in the early stages but at later stages RNA values decreased. A hypothesis for the regulation of DNA and RNA synthesis by the cell volume is proposed.
Published Version
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