A. HANSEN postulated already in 1879 that plants are totipotent. He referred to the power of regeneration of Begonia which can develop new plantules of leaf cuttings, a feature still used by gardeners today. His statement was generalized by G. HABERLAND (Universität Graz). But proof was supplied only recently with the regeneration of a differentiated plant cell into a complete plant. Successful research into plant cells is dependent on the development of expandable methods for the cultivation of tissues, single cells and protoplasts. In the following are several studies that contributed essentially outlined.
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