Rooting and early shoot characteristics of Picea abies (L.) Karst. cuttings originating from shoots with enforced vertical growth
1988
Bentzer, B.G. (Hilleshoeg AB, Landskrona (Sweden))
Picea abies mother-plants from 10 serially propagated clones (14 years old, chronologically) were treated in four different ways: (1) control with intact, non-manipulated plants; (2) like (1) but with the leader cut off; (3) intact plants but with all branches of the upper two whorls forced to grow in a vertical way; and (4) like (3) but with the leader cut off. Cuttings from four positions (cutting-types) on the mother-plants were collected, rooted and evaluated for rooting %, number of main roots, number of lateral roots, plagiotrophy, needle symmetry on leader and growth of leader. Treatments 3 and 4 resulted in cuttings with more plagiotrophic growth but with better rooting, more lateral roots and better growth than did cuttings from treatments 1 and 2. The genotype had a significant influence on rooting. Number of main roots was significantly influenced by the genotype and the cutting-type, but not of the mother-plant treatment. Symmetry of needles on the leader was fairly weakly influenced by genotype and cutting-type yet not influenced by mother-plant treatment. Clone effect was significant for leader growth.
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