Abstract
Four groups of five rapeseed plants (Brassica napus L.) were injected with sodium acetate-2-C14 at intervals between flowering and maturity. Two C14-labeled proteins were isolated from a water extract of the oil-free seed meal. The specific activities of the two proteins and of some amino acids isolated from them suggested rate differences in protein synthesis, or, alternatively, conversion of one protein into another. The results also showed that synthesis of these proteins occurs over a considerable period in the plant''s development.