Abstract
Softwood stem cuttings of Cryptomeria japonica (L.f.) D. Don `Yoshino' consisting of (1) tips (terminal 20 cm) of first order-laterals (secondary axes), (2) the distal half (terminal 10 cm) of tips of first-order laterals, (3) the proximal half (basal 10 cm) of tips of first-order laterals or (4) tips (terminal 10 cm) of second-order laterals (tertiary axes) were treated with 0, 3000, 6000 or 9000 ppm 1H-indole-3-butyric acid (IBA) and placed under intermittent mist for 12 weeks. IBA treatments did not effect percent rooting, root number, root length, or root dry weight Tips of first-order laterals and the proximal half of first-order laterals yielded the highest rooting percentages (75% and 78%, respectively), whereas the distal half of the first-order laterals and tips of second order laterals rooted in lower percentages (50% and 34%, respectively). Tips of first-order laterals and the proximal half of first-order laterals both produced 4.5 roots per cutting. Root length, root area and root dry weight were also highest with these two branch positions.
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