Propagation of Ornamental Plants
8(2): 93-98, 2008
MICROPROPAGATION AND IN VITRO CONSERVATION OF VIRUS-FREE ROSE GERMPLASM
Alberto Previati1, Carla Benelli2, Francesco Da Re1, Aylin Ozudogru2**, and Maurizio Lambardi2*
1Experimental Centre for Flower and Horticulture “Po di Tramontana”, Veneto Agricoltura, 7 Moceniga str., 45010 Rosolina (Rovigo), Italy 2IVALSA/Trees and Timber Institute, CNR (National Research Council), Scientific Pole, 10 Madonna del Piano str., 50019 Sesto Fiorentino (Firenze), Italy, *Fax: +39 055 5225656, *E-mail: lambardi@ivalsa.cnr.it **Current address: Gebze Institute of Technology, 41400 Gebze-Kocaeli, Turkey
Abstract
Today, the propagation and the production of roses should be in accordance with the EU regulations, mainly concerning the commercialization of plants free from “quality pathogens”, i.e., ApMV, ArMV and PNRSV viruses. Hence, the possibility of recovering virus-free material by means of thermotherapy and shoot-tip culture, as well as propagating and preserving high-quality shoot cultures in vitro, should be considered of strategic importance. Here, effective protocols of micropropagation, in vitro thermotherapy, synthetic seed preparation and slow growth storage are reported for an ancient hybrid tea rose, the ‘Rosa Sant’Antonio di Padova’, and a selection of Rosa City Flor®, the ‘Domenica’. Virus-free shoot culture lines were obtained by the treatment of single shoots at 37ºC for 2 weeks, followed by shoot-tip excision and culturing in gelled BA-containing MS medium. Synthetic seeds of ‘Rosa di Sant’Antonio di Padova’ were produced by hardening 3% Na-alginate beads, containing apical buds, in 100 mM CaCl2·2H2O solution for 30 min. All the synseeds were then able to “germinate” in 10-11 days, independently from the presence of sucrose in the “artificial endosperm” of the bead. As for slow growth storage, both the cultivars could be successfully conserved at 4ºC in the dark inside glass jars for up to 6 months, while the conservation inside plastic cylinders and gas-permeable plastic bags was less effective. In addition, promising results were achieved with the cryopreservation of ‘Domenica’ by means of the treatment of shoot tips with a vitrification solution (PVS2) for 60 min, followed by their direct immersion in liquid nitrogen.
Key words: cryopreservation, micropropagation, rose, slow growth storage, synthetic seeds, thermotherapy
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