Abstract
Plantlets of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), taken at transplantation and at 7 weeks after transplantation to greenhouse conditions, were compared morphologically to 7–9 week-old greenhouse-grown seedlings. Compared to seedlings, new transplants had poorly-developed root systems as indicated by a high needle surface area/root surface area ratio and shoot dry weight/root dry weight, and low root surface area, lateral root number, root length and root surface area/root dry weight. Although plantlet morphology had improved after 7 weeks, roots still were not as well-developed as seedling roots. Results also indicated that plantlets may have utilized nutrient reserves from persistent needles to support new root growth, in the absence of posttransplantation shoot growth.
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