Fig. 4.

The method of V _v specification. a The cell packet that derived from the initial of rhizodermis and lateral part of the root cap; from this initial (circle) at first the cell triad (grey), then the whole packet are formed; the zones are as in Fig. 1, red lines mark u ₀ and v ₀. b The tetragon (black) describing the part of the cell packet localized in the lateral root cap and epidermis at the stage of the cell triad: AB, the length along v ₀; AC, length along u ₀. c The tetragons assumed to describe the whole cell packet (thin black) and the region of the cell packet localized in the lateral root cap and epidermis (grey dashed), i.e., without the part protruding from this zone. d The tetragons of different AC/AB ratios obtained in the course of the computer simulation at times corresponding to three different stages of the cell packet development. Assuming different values of the parameter d for constant AB determined by c = 0.8 the most realistic shapes corresponding to black tetragon in b and grey dashed tetragon in c are achieved for d = 0.12. For more explanation, see text