Rooting of Cuttings of Acer Rubrum l. And Eucalyptus Camaldulensis Dehn.

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Abstract
Rooting of cuttings of A. rubrum and E. camaldulensis taken from seedlings grown under controlled conditions was stimulated by auxin treatments. Indolyl-butyric acid at a concentration of 1.0 mg/l was the optimal auxin treatment. Rooting of cuttings was affected by the light conditions under which seedlings were grown. In addition to auxin, leaves were essential for optimal rooting. Nitrogen compounds alone or together with sucrose appeared to play some role in this leaf effect, at least with A. rubrum cuttings, but this did not appear to be a direct role. Gibberellic acid and kinetin both inhibited rooting when applied at the base of A. rubrum cuttings. This inhibitory effect of gibberellic acid was noted even in the presence of added auxin. In contrast to its effect when applied at the base, kinetin stimulated rooting of A. rubrum cuttings when applied to the leaves. There was no evidence that this stimulatory effect was due to changes in the auxin-kinetin balance. Variation in rooting of replicate cuttings was observed; this variation in rooting of A. rubrum cuttings was correlated positively with the amount of anthocyanin found in the leaves. A possible link between rooting and anthocyanin synthesis is discussed and a speculative scheme of reactions important in root initiation is presented.

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