Biology Reference
In-Depth Information
FIGURE 4.9
Tip growth of the hyphae of a basidiomycete fungus.
on the side-walls of hyphal cells can develop a 'tip' character themselves, and this tip then
begins to extend as a branch; in this way, a network can be built up
16
(
Figure 4.9
).
This chapter has presented only the briefest outline of cellular morphogenesis, with the
aim of illustrating typical changes of shape and of sketching some of the ways in which
the morphogenesis of cells can contribute directly to the form of the organism. The variety
of cell shapes is far wider than those listed above, and the shapes themselves can become
fantastically complicated, especially amongst unicellular plankton. The examples on which
this chapter has focused have been chosen because they represent the types of cell morpho-
genesis that have been studied most closely. The molecular mechanisms that drive cell
morphogenesis are the focus of the next two chapters.
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