Biologia plantarum 2012, 56:78-82 | DOI: 10.1007/s10535-012-0019-0

Anatomy and osmotic potential of the Vitis rootstock shoot tips recalcitrant to cryopreservation

T. Ganino1,*, A. Silvanini1, D. Beghè1, C. Benelli2, M. Lambardi2, A. Fabbri1
1 Dipartimento di Biologia Evolutiva e Funzionale - Sezione Biologia Vegetale, Università degli Studi di Parma, Parma, Italy
2 Istituto per la Valorizzazione del Legno e delle Specie Arboree, CNR, Sesto Fiorentino, Italy

This study was carried out on Kober 5BB (Vitis Berlandieri × V. riparia) grape rootstock shoot tips during the preparatory steps preceding the direct immersion in liquid nitrogen, in order to overcome until now unsuccessful cryopreservation with this species. The exposure of shoot tips to 0.3-0.4 M sucrose leads to a high cell solute concentration. The treatment with plant vitrification solution (PVS2) alone, i.e., not followed by storage in liquid nitrogen, markedly affected shoot tip survival. After a 30 min exposure, regrowth percentage of shoot tips decreased from 94 % (control) to 57 %, and dropped to 15 % when the treatment was prolonged up to 60 min. After a 90 min exposure, no regrowth occurred. In addition, plantlets regenerated from shoot tips which underwent 60 min or more exposure to PVS2 showed signs of malformation. Microscope observations of shoot tips treated with 0.3 or 0.4 M sucrose and 30 min PVS2 showed the presence of cells starting to plasmolyze, localized in the area surrounding the apical meristem. A limited presence of starch grains in meristem and bract cells was also noted. However, the most conspicuous consequence of prolonged PVS2 treatment was convex plasmolysis. The phenomenon was dependent on the time of PVS2 exposure. Indeed, after a 30 min treatment, plasmolysis was minimal or absent, but it increased with longer exposure to PVS2 at 4 °C.

Keywords: grapevine; micropropagation; plant vitrification solution; plasmolysis; sucrose
Subjects: plant vitrification solution; plasmolysis; sucrose; in vitro culture; benzyladenine; anatomy - shoot tip; grapevine rootstock
Species: Vitis Berlandieri x V. riparia

Received: May 24, 2010; Accepted: December 6, 2010; Published: March 1, 2012Show citation

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Ganino, T., Silvanini, A., Beghè, D., Benelli, C., Lambardi, M., & Fabbri, A. (2012). Anatomy and osmotic potential of the Vitis rootstock shoot tips recalcitrant to cryopreservation. Biologia plantarum, 56(1), 78-82. doi: 10.1007/s10535-012-0019-0.
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