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Two grapevine clones of two different species of the genus Vitis were cultured in vitro for 14 months without renewal of the culture medium. This long-term storage experiment was in three successive phases: (1) culture of microcuttings at 21 °C for the first month; (2) storage with slow growth at + 12 °C for 11 months; (3) return to 21 °C for 2 months. Shoot and root growth, dry matter content of the plants and uptake of carbohydrates were measured during each phase of culture. Considerable differences in behaviour were observed between the two varieties studied.

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