Studies of the rooting of cuttings ofHydrangea macrophylla: DNA and protein changes

摘要

The anatomy of root initiation ofHydrangea macrophyllaand associated changes in protein and DNA synthesis during adventitious root formation are described. Observations showed that adventitious roots originated from preformed root initials in the phloem ray parenchyma cells. The roots appeared 10 to 12 days after the cuttings were made.The total protein content of the root initials increased over 100% in the first 4 days, while there was no rapid increase in DNA content of the cells until the sixth day. The estimated mean content of total protein per cell stabilized on or before the sixth day from the time the cuttings were made, and thenceforth appeared to come into equilibrium with the rate of cell division.