ENHANCING THE ROOTING OF CANADA YEW STEM CUTTINGS WITH IBA TREATMENTS

摘要

Studies on rooting stem cuttings of Taxus canadensis Marsh., a shrub containing an anti-cancer chemical, paclitaxel, are reported. Dipping the stem base in a powder (0.8% IBA) improved neither the rooting nor the growth of adventitious roots (comparedwith controls) regardless of predetermined clone rooting abilities. Quick dips in concentrated IBA (0, 0.5, 1.0 1.5 and 2.0% in 50% ethanol) stimulated rooting, with 0.5% and 1.0% producing the best survival, while the 2% dip gave the best root growth.Clone ortets classified as good or recalcitrant (difficult to root) did not differ significantly in their Ingestad nutrient ratios and in foliar ma-cronutrient concentrations, except for Ca, which had a greater concentration and larger ratio in the recalcitrant category. Concentrations of N and P were positively correlated with the rooting percentage, whereas K and Mg concentrations were negatively correlated.