A Classical Apple Experiment
A commercial apple tree consists of two parts grafted together. The upper, the scion, determines the main characteristics of the fruit and leaves, while the lower, the root-stock, largely determines the size and development of the tree. At the beginning of the century it was generally accepted that a root-stock propagated asexually, for example by cuttings or from a stool-bed, gave a dwarf tree, whereas one propagated sexually, that is from seed, gave a large tree.
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