, rootstock calibre, grafting technique, etc. In 2011, the key points which need to be further examined are the optimal bud residual moisture content, the slow cooling, rewarming and rehydration phases, as well as some technical questions related to grafting, morphotypes, rehydration phase (technique used and duration)

A. Peyrière, F. Montpellier, R. Volk, J. Bonnart, and . Waddell, JKI Dresden-Pillnitz

L. E. Towill, P. L. Forsline, C. Walters, J. W. Waddell, and J. Laufmann, Cryopreservation of Malus Germplasm using a winter vegetative bud method: results from 1915 accessions, CryoLetters, vol.25, pp.323-334, 2004.

L. E. Towill and D. D. Ellis, Cryopreservation of dormant buds, Plant Cryopreservation, a Practical Guide, Reed BM, pp.421-435, 2008.