MICROPROPAGATION OF THE GRAPEVINE - RESULTS OF 10 YEARS OF EXPERIMENTS IN THE CHAMPAGNE VINEYARD AND RESULTS OF THE FIRST VINIFICATIONS

The traditional technique of grapevine propagation through woody graft ing multiplication could be usefully complemented by the in vitro micr o-propagation process and by the green grafting method. In this work, the possibilities and limits of the in vitro propagation process were studied. About two hectares of experimental in vitro grapevines were p lanted in a Champagne vineyard, and their viticultural and enological characteristics were studied over a period of 10 years. Compared to co ntrol vines, no morphological difference and no phylloxera damage were observed on the 41 B (Vitis vinifera cv. Chasselas X Vitis berlandier i) and 333EM (Vitis vinifera cv. Cabernet Sauvignon X Vitis berlandier i) from in vitro propagated vines, planted in the field in 1985, after the plants had reached eight years of age. However, some leaves and o ne-year-old stem of in vitro propagated Chardonnay and Pinot noir vine s showed some vegetative differences compared to the control vines. As a consequence of poor flower differentiation, the in vitro grapevine production was about 50% lower than the production from control vines for the four first years, but the developed berries were normal (shape , size, maturity). All abnormal differences progressively disappeared after seven years. In vitro and control fermentation and tasting resul ts from 1989 to 1993 were similar. No significant preferences in Chard onnay and Pinot noir base wines from micro-propagation and control gra pevines were detected by a panel of trained judges.