Application of vitrification-derived cryotechniques for long-term storage of poplar and aspen (Populus spp.) germplasm

Authors

• Ivaylo Tsvetkov Forest Research Institute, 132, Kl. Ohridski Blvd., 1756 Sofia, Bulgaria
• Carla Benelli IVALSA/Istituto per la Valorizzazione del Legno e delle Specie Arboree, NationalResearch Council (CNR), 50019 Sesto Fiorentino, Firenze, Italy
• Maurizio Capuana IGV/Istituto di Genetica Vegetale, National Research Council (CNR), 50019Sesto Fiorentino, Firenze, Italy
• Anna De Carlo IVALSA/Istituto per la Valorizzazione del Legno e delle Specie Arboree, NationalResearch Council (CNR), 50019 Sesto Fiorentino, Firenze, Italy
• Maurizio Lambardi IVALSA/Istituto per la Valorizzazione del Legno e delle Specie Arboree, NationalResearch Council (CNR), 50019 Sesto Fiorentino, Firenze, Italy

DOI: https://doi.org/10.2137/145960609789267515

Keywords:

aspen, cryopreservation, droplet vitrification, encapsulation-vitrification, Populus spp., PVS2 vitrification

Abstract

The application of three different vitrification-based freezing strategies for the cryostorage of white poplar (Populus alba L.) and hybrid aspen (P. tremula L. × P. tremuloides Michx.) have been assessed. The PVS2 vitrification protocol was successfully applied to two white poplar in vitro clones stored for more than 6 months in slow-growth conditions (4 °C, in darkness) and showing clear signs of explant etiolation and decay. After 60 min of PVS2 treatment, P. alba L. (cv. Villafranca) explants isolated from axillary buds demonstrated significantly better potential for post-freeze regrowth (64%) compared to those obtained from apical buds (17%). Similarly, a high level of survival (78%) of the frozen hybrid aspen shoot tips was recorded following the application of the same technique. Using the encapsulation-vitrification procedure, no toxic effects of the PVS2 treatment were noticed after 120 min exposure, however none of the cryopreserved (poplar and aspen) explants survived after 3 weeks. In contrast, the droplet-vitrification technique appeared to be very efficient in the cryopreservation of white poplar shoot tips, which increases the opportunities for wider application of this method in other woody species.;