Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Physiologia plantarum
57 (1983), S. 0
ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Rooted cuttings of three clones of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] were growing plagiotropically two seasons after propagation. The oblique growth habit of cuttings was due, in part, to dorsoconvex curvature of the wood of the original 12-cm cuttings after rooting. In cross sections taken 1.5–2.0 cm from the bases of cutting stems, the total widths of xylem and compression wood were significantly greater on the morphologically upper (convex) than on the lower sides of the stems. This was due to an asymmetry in the growth ring produced the season following rooting. In nearly every cross section examined, 80–90% of the width of the upper side of this growth ring was compression wood. Examination of cross sections taken 1.5–2.0 cm from the distal ends of the wood of original cuttings revealed a shift in the position of compression wood formation during the second season. As the distal portions of their stems were displaced from the vertical by curvature, cuttings of two clones produced compression wood on their lower sides in this region. Cuttings from the third clone, which showed the least basal curvature, continued forming compression wood on their upper sides in the distal portions of the original cuttings.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1983.tb02303.x
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