Abstract
A heterophyllous plant of Ludwigia arcuata, displays developmental plasticity; ethylene-treated young leaves matured into spoon-shaped leaves, while untreated leaves matured into round-shaped aerial leaves. Comparison of developmental process between such spoon-shaped and control leaves revealed that the alternation of distribution, orientation, and frequency of cell divisions was induced. Here we intend to clarify the relationship between cell division pattern and leaf shape formation and try to establish a dynamic model of leaf development. This model follows subsequent three conditions: preservation of cell-cell relationships (1), recovery of cell size to original ones after division (2) and parameters such as distribution, orientation, and frequency of cell division being considered (3). Computer simulation on these was reflected in the growth for the leaf transverse directions. However, this consideration is not sufficient to the longitudinal direction, implying growth for longitudinal direction needs more considerations. Details on modeling will be explained by the next speaker.
