Nucleic acids and protein metabolism in barley seedlings. II. Interrelations of the different organs

The RNase activity, the acid-soluble, soluble N, RNA, DNA and protein contents have been followed in the shoot, the roots, the scutellum and the endosperm of germinating barley. A correlation between RNase activity and RNA content has been observed in the growing organs. Results suggest the existence of a translocation of macromolecules associated with synthetic processes. Three phases can be recognized during the germination of barley seeds grown on water in the absence of photosynthesis: (1) a 3-day period in which translocation predominates; (2) another 3-day period in which synthesis takes over; and (3) a long etiolation period associated with catabolic processes. On the basis of our results the possible role of RNase as a morphogenetic substance is suggested.