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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

SANTELICES, RÓMULO  and  CABELLO, ÁNGEL. Effect of indolebutyric acid, bottom heat, substrate, and parent tree on rooting capacity of Nothofagus glauca (Phil.) Krasser stem cuttings . Rev. chil. hist. nat. [online]. 2006, vol.79, n.1, pp.55-64. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2006000100005.

Nothofagus glauca (Phil.) Krasser is a tree of conservation concern that is characteristic for the mesomorphic zone of Chile. Techniques for vegetative propagation of this species are not well known. In this study, the rooting capacity of stem cuttings was investigated. Using vegetative material collected in November 1995 and 1997, the effect of indolebutyric acid (IBA = 0, 0.5, 1, and 2 %), bed rooting system (bottom heating and without temperature control), substrate (sawdust and bark compost of Pinus radiata D. Don), and parent tree on rhizogenesis was analyzed. Experiments were conducted for 2.5-4 months in a greenhouse. The greenhouse was equipped with an automatic misting system and bottom heating that maintained a temperature of 21-25 °C at the stem base. Results indicate that N. glauca can be propagated from stem cuttings collected from root sprouts in November. Rooting capacity increased with IBA concentrations up to 1 % (88 % of the stem cuttings presented rooting), and decreased at a concentration of 2 %. The presence of leaves was fundamental for the survival and rhizogenesis _ only those stem cuttings with leaves managed to survive and induce root formation. No effect of basal temperature was noted on the rooting capacity consequently, temperature controlled rooting beds are not necessary. Sawdust produced more roots and was the most effective substrate. A marked influence of the parent tree on rooting capacity was observed as well in terms of the percentage of cuttings with roots (6.7-80 % rooting) as in length and quantity of the developed roots

Keywords : Nothofagus glauca; cuttings; indolebutyric acid; substrate; parent tree.

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