EX VITRO SYSTEM FOR Acer palmatum PLANTS PROPAGATION BY MINI-CUTTINGS TECHNIQUE

Abstract

This study presents an efficient system with high productivity and quality for Acer palmatum propagation. We evaluated the efficiency of mini-cuttings technique, management of mini-stumps, production of shoots, rooting and root vigor of mini-cuttings on two seasons. The mini-stumps were planted in pots of two liters, put up in two environments (full sunlight area and shade house) and submitted to weekly fertigation. Over six collections, we evaluated the survival and productivity of clonal mini-garden (Experiment I). From these, we performed two experiments with mini-cuttings: Experiment II -mini-cuttings originated from two environments, with 8±1 cm, put to root in two seasons (Spring and Summer); Experiment III -minicuttings originated from full sunlight area, with 4±1, 6±1, 8±1, 10±1 cm, put to root in Summer. The mini-cuttings planting was made in plastic tubes of 55 cm³, filled with fine vermiculite and carbonized rice hulls (1:1 v/v), in a greenhouse with intermittent irrigation system. The high rooting (95.0%), mini-stumps survival (100%) and mini-cuttings production (217.5 mini-cuttings m -2 month -1 ) in clonal mini-garden conducted in full sunlight area shown the technique viability for the species. Mini-cuttings of 8±1 cm favored rooting (96.3%). The mini-cuttings technique is viable for Acer palmatum propagation. SISTEMA EX VITRO DE PRODUÇÃO DE MUDAS DE Acer palmatum POR MINIESTAQUIARESUMO: Um sistema de produção de mudas eficiente, com elevada produtividade e qualidade é apresentado neste estudo para Acer palmatum. Avaliou-se a eficiência da miniestaquia, manejo das minicepas e produção de brotos em duas estações no enraizamento e vigor radicial de miniestacas. As minicepas foram plantadas em vasos de dois litros, acondicionadas em dois ambientes (pleno sol e casa de sombra) e submetidas a fertirrigação semanal. Ao longo de seis coletas avaliou-se a sobrevivência e produtividade do minijardim clonal (Experimento I). A partir destes, realizou-se dois experimentos de miniestaquia: Experimento II-miniestacas de dois ambientes, com 8±1 cm, instaladas em duas estações do ano (primavera e verão); Experimento III-miniestacas de pleno sol, com 4±1, 6±1, 8±1, 10±1 cm, instaladas no verão. O plantio das miniestacas foi realizado em tubetes de 55 cm³, preenchidos com vermiculita de granulometria fina e casca de arroz carbonizada (1:1 v/v), acondicionados em casa de vegetação com sistema de irrigação intermitente. O elevado enraizamento (95,0%), sobrevivência de minicepas (100%) e produção de miniestacas (217,5 miniestacas m -2 mês -1

VIABILITY OF THE MINI-CUTTING TECHNIQUE IN THE PRODUCTION OF Drimys brasiliensis Miers SEEDLINGS

“…This results exposeEsses resultados emphasize the adequate the environmental conditions (temperature and umidity) of the greenhouse, also justifying by the high numbers of mini-cuttings with sproutingst and that mantained their original leaves (Table 1) RODRIGUES, 2001;BORGES et al, 2011). Similar results were observed by Stuepp et al (2016) in studies with mini-cuttings of the Acer palmatum, a arboreal species, in which the average of survival of the mini-cuttings was of 17.5% and mortality of 18.8%, with rooting of approximately 95%.…”

Pruning management of mini-stumps for mass propagation of blueberry

“…bras., Brasília, v.56, e02486, 2021 DOI: 10.1590/S1678-3921.pab2021.v56.02486 of propagule donor matrices (Xavier et al, 2013). This control occurs through the management of the clonal mini-garden and, when done properly, can amplify morphophysiological characteristics of interest for rhizogenesis, such as youthful vigor, potentiating the rooting success of mini-cuttings (Stuepp et al, 2016). The mini-cutting technique was initially developed for forest species, but has been considered for the vegetative propagation of fruit trees that do not need to reach a high degree of maturity (Stuepp et al, 2018), such as blueberry.…”

Use of KOH in IBA dissolution and substrate formulation in the rooting of Acer palmatum Thunb. cuttings

“…The seed-propagation of the species has the need of long stratification periods to overcome their dormancy (Toth and Garret, 1989). Because of this limitation, there is a need for studies that investigate new ways of propagating the species (Stuepp et al, 2016). One way to overcome such issue is the vegetative propagation by cuttings, which has numerous advantages, such as allowing large-scale propagation from propagating material from a few, or even a single, matrix plant in shortterm and low cost, simple execution and high uniformity of seedlings (Fachinello et al, 2005).…”

“…One way to overcome such issue is the vegetative propagation by cuttings, which has numerous advantages, such as allowing large-scale propagation from propagating material from a few, or even a single, matrix plant in shortterm and low cost, simple execution and high uniformity of seedlings (Fachinello et al, 2005). Some techniques have already been used to vegetatively propagate the species of A. palmatum, such as herbaceous cuttings and mini-cuttings (Emer et al, 2016;Stuepp et al, 2016).…”