Notes: Production, Propagation, and Shoot Elongation of Cuttings from Sheared 1-Year-Old Douglas-fir Seedlings

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Eight rapidly grown 1-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings which had been sheared at 5 months and again at 7 months of age yielded 28 to 82 (mean of 45) rooted cuttings. Auxin pretreatment did not influence the percentage of cuttings that finally rooted, but it did significantly accelerate root initiation and promote subsequent shoot elongation by the ramets. Clonal differences in shoot elongation after one growing season were highly significant. Rooted cuttings grew nearly as rapidly as seedlings (4.8 vs 6.0 mm/wk); many exhibited plagiotropism but some began to assume an upright habit by the end of the rooting year. The technique holds promise for rapidly cloning experimental material and superior genotypes. Forest Sci. 21:298-300.

Keywords: Auxin; Pseudotsuga menziesii; clonal differences; mass propagation; plagiotropism

Document Type: Miscellaneous

Affiliations: Project Leader, Forest Tree Physiology Research, Tree Improvement Group, Weyerhaeuser Company Forestry Research Center, Centralia, Washington 98531

Publication date: September 1, 1975

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