Abstract
ABSTRACTWe aimed to evaluate the technical efficiency of mini-cuttings technique on vegetative propagation of Paulownia fortunei (Seem.) Hemsl. var. Mikado, as well as the possible existence of anatomical barriers to its rooting. Therefore, plants originated from cuttings formed the mini-stumps and, consequently the clonal mini-garden, which was conducted in semi-hydroponic system. We evaluated the survival of mini-stumps and sprouts production for five successive collects, the percentage of mini-cuttings rooting and their anatomical description. The mini-cuttings were prepared with about 6 to 8 cm in length and two leaves reduced by about 50% in the upper third, being remained an area of, approximately 78 cm2 (10 cm diameter). The mini-cuttings were placed in tubes of 53 cm3, with substrate formed with fine vermiculite and carbonized rice hulls (1:1 v/v) and rooted in acclimatized greenhouse. After 30 days we evaluated the percentage of rooted mini-cuttings, radicial vigor (number and length of roots / mini-cutting), callus formation, emission of new shoots and maintenance of the original leaves. The mini-stumps showed 100% survival after five collects and an average production of 76-114 mini-cuttings/m2/month and rooting ranged from 70 to 90%. Mini-cuttings technique is efficient in to propagate adult propagules of the species and there are not anatomical barriers preventing roots emission.
Highlights
Vegetative propagation or cloning consist of multiplying asexually plant parts to generate new plants genetically identical to the mother tree, not occurring gene recombination (HARTMANN et al, 2011)
This study aimed to evaluate the technical efficiency of mini-cuttings technique for vegetative propagation of Paulownia fortunei var. mikado, as well as the possible existence of anatomical barriers to rooting mini-cuttings
Rooted cuttings of Paulownia fortunei var. mikado were transferred to semi-hydroponic system suspended in sand bed, spaced 20 cm x 20 cm, in February 2012, at the Forest Species Propagation Laboratory (Embrapa Forests, Colombo-PR)
Summary
Vegetative propagation or cloning consist of multiplying asexually plant parts (cells, tissues, organs) to generate new plants genetically identical to the mother tree, not occurring gene recombination (HARTMANN et al, 2011). The slowness in the germination process, combined with large phenotypic variation of sexual propagated trees, generates the need for more detailed studies with regarding alternatives to propagate the species (BERGMANN, 1997). In this sense, we can demonstrate the potential of mini-cutting technique for obtaining a large amount of seedlings in a short time
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