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Abstract
Clonal analysis of leaf morphogenesis in maize and tobacco presents a picture of this phenomenon that differs in several important respects from classical views of leaf morphogenesis. This approach demonstrates that 1) the leaf primordium and the leaf blade are derived from a relatively large group of cells in each of several tissue layers rather than from a small number of cells in 1 or 2 layers, 2) these founder cells do not function as “stem” cells; each founder cell lineage has a limited and characteristic destiny, 3) neither the orientation of cell division at the margin of the blade, nor the frequency of cell division in this region indicates the existence of a marginal meristem, and 4) both the rate and duration of cell division exhibit considerable spatial and temporal variation during the expansion of the leaf blade.
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