Microchemical Studies of Rooting and Non-Rooting Rose Cuttings

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Abstract
Adventitious roots are produced in humid air on the new shoots from cuttings of Dorothy Perkins (D. P.) and not from like portions of American pillar (A. p.). Microchemical examination showed that D. P. cuttings contained more reserve starch than A. p. At the time of rooting, D. P. had considerable reserve starch remaining, while during a similar period the reserve starch of A. p. was depleted. Changes in the reserves were the same in both roses. As the starch in the canes was hydrolyzed, reducing sugars increased, especially in the new branches. Asparagin was abundant in the branches after 8-11 days. Only slight differences in anatomy of the over-wintered canes were noted. A swelling at the base of new branches of D. P. was produced by an unusual development of secondary phloem. Adventitious roots were initiated in this region. These changes did not occur in A. p. branches. Rooting from the bases of young shoots of D. P. seemed to be related to the high content of reserve starch.

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