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Single-node cuttings of `Autumn Flame' and `Indian Summer' red maple  (Acer rubrum  L. and  A. ×  freemanii E. Murray) were placed in subirrigated perlite that was kept at 29, 33, or 36 C at the cut ends for 3 weeks. Number and mass of roots and pigment quality and transpiration of leaves were greater for `Autumn Flame' than `Indian Summer' and decreased with increasing temperature for both cultivars. Rooting percentage at 29, 33, and 36 C was 75, 75, and 25 for `Autumn Flame' and 13, 13, and 0 for `Indian Summer'. Earlier work has shown &gt; 90% of cuttings of both cultivars root at ≈ 22 C, and plants of `Autumn Flame' are more heat resistant than those of `Indian Summer'. Results of this experiment suggest the effect of heat on rooting of cuttings might be used to predict genotypic differences in heat resistance of whole plants.

566 PB 003 HEAT EFFECTS ON ROOTING SOFTWOOD CUTTINGS OF `AUTUMN FLAME' AND `INDIAN SUMMER' RED MAPLE