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Cupric carbonate controls green ash root morphology and root growth



Cupric carbonate controls green ash root morphology and root growth



Hortscience 24(2): 262-264



Dormant 1-year-old bare-root green ash (Fraxinus pennsylvanica Marsh.) seedlings were grown in CuCO3-treated (inner surfaces of plastic containers were painted with 100 g CuCo3/liters flat-white exterior acrylic latex paint) and untreated plastic containers to study the effects of CuCO3 on root growth. Plants grown in CuCO3-treated containers were nearly 50% taller than plants grown in untreated containers (119 vs. 81 cm, respectively). Root contacting CuCO3-treated surfaces had near zero elongation rates within 3 days. Roots inhibited by contacting CuCO3-treated surfaces were not killed and resumed elongation rates similar to non-CuCO3-treated roots within 3 to 6 days of release from CuCO3. Roots contacting CuCO3-treated surfaces were 50% shorter (14 vs. 28 cm), branched closer to the root apex (2.4 vs. 4.7 cm), and had more higher-order lateral roots (10.6 vs. 7.6) than roots contacting untreated container surfaces. Seedlings grown in CuCO3-treated containers had higher Cu concentrations in main roots, tips, stems, and foliage than seedlings grown in untreated containers.

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