Vegetative propagation of mature dragon trees through epicormic shoots

Abstract

SUMMARYEpicormic shoots were induced in stumps and detached branches of adult Paulownia fortunei var. mikado plants to evaluate rooting potential. Stem cuttings obtained from shoots of stump were prepared with 12 cm in length and two leaves reduced to 78.5 cm² (10 cm diameter). Cuttings from shoots of branches were prepared with 8-10 cm in length, and two leaves reduced to 50 % of the original size. Anatomical analysis was performed to evaluate possible barriers to rhizogenesis. After disinfestation, indolebutyric acid (IBA) was applied (0, 500, 1,000, 1,500 and 2,000 mg L -1 ). Installation was made in plastic pots with a volume of 170 cm³ and 53 cm³, respectively for each type of cuttings, with fine vermiculite and carbonized rice hulls (1:1 v/v) as substrate. After 60 days in a greenhouse, cuttings from epicormic shoots of branches presented rooting (58.12 %) and the average length of the three longest roots/ cutting (4.76 cm) was higher than in cuttings from stumps. The highest number of roots/cutting (7.66) and percentage of cuttings with callus (27.50) was observed in cuttings from stumps. There were no anatomical barriers observed harming the roots formation in the two types of cuttings. The use of indolebutyric acid is not required to induce rooting.

MÉTODOS DE RESGATE E IDADES CRONOLÓGICAS DE PLANTAS-MATRIZES NO ENRAIZAMENTO DE BROTAÇÕES EPICÓRMICAS DE <i>Ilex paraguariensis</i>

“…A estaquia tem sido a técnica de propagação vegetativa utilizada em diversas espécies lenhosas (BITENCOURT et al, 2009;FERREIRA et al, 2010;STUEPP et al, 2014), por ser uma excelente ferramenta para auxiliar programas de melhoramento florestal (BRONDANI et al, 2008). No entanto, são escassos os estudos que buscam avaliar os efeitos da maturação na propagação vegetativa em erva-mate (WENDLING et al, 2013;STUEPP et al, 2016), limitando o seu sistema de produção de mudas, principalmente na busca pelo resgate de genótipos de avançada idade ontogenética (WENDLING et al, 2014).…”

VEGETATIVE RESCUE AND ROOTING OF CUTTINGS OF DIFFERENT STOCK PLANTS OF Sequoia sempervirens

“…Two commonly used procedures for the rescue of adult plants are felling and girdling to induce epicormic budding (STUEPP et al, 2014). These buds have morphological and physiological characteristics of juvenile plants, of fundamental importance for the recovery of the rizogenetic capacity (MELO et al, 2012;WENDLING et al, 2013).…”

Quality of clonal plants of Piptocarpha angustifolia in different renewable substrates and seasons of the year

“…The miniclonal garden was formed by P. angustifolia cuttings produced according to the plant rescue method through epicormic shoots (Stuepp et al, 2014). The cuttings were planted in a semi-hydroponic system with sand and were spaced at 20x20 cm in May 2013, following the method described in .…”