ISHS Acta Horticulturae 630: XXVI International Horticultural Congress: Nursery Crops; Development, Evaluation, Production and Use
IMPROVING VEGETATIVE PROPAGATION OF SUGAR MAPLE (ACER SACCHARUM MARSH.) |
| Authors: | C. Richer, J.A. Rioux, D. Tousignant, N. Brassard |
| Keywords: | phenological markers, stem water, light exclusion, hormones |
| Abstract:
The water content of the stem base and the number of pairs of scales on the terminal bud were identified as phenological markers of the optimum collection time for cuttings on 9-yr-old sugar maple trees. Seasonal progression of these indicators also reflected meteorological particularities during the growth season in 1999 (warm and early spring) and 2000 (cool and rainy). Results indicated that in Quebec the period to collect sugar maple cuttings spans over approximately 6 weeks in June and July with significant year-to-year variations. Total or partial light exclusion treatments on 2- and 9-yr-old trees before harvesting cuttings, did not stimulate root formation for field plants (9-yr-old), but etiolation treatment stimulated rooting of cuttings from plants forced in greenhouse (2-yr-old). There was no difference in the ability to stimulate rooting between the 15 hormonal/chemical treatments applied on 23 9-yr-old trees. However, a large variability between them was obtained. The most common hormonal treatments (Stim-Root® no. 2, IBA and NAA solutions) confirmed that variability. A study on 35 9-year-old trees grown from seeds originating from five climatic zones in Quebec showed that the clone effect is more important than the provenance effect. The last two experiments did not reveal any interaction between clones and treatments. | |
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