Figure 4.

Overview of the main elements in the regulatory system involved in the initiation of the formation of primordia in basidiomycetes. PR = Photoreceptor. (adapted from Nagy et al. [4]). Initiation of fruiting body development in A. bisporus is influenced by carbon dioxide, temperature and the removal of a self-produced inhibitor (either ethylene or C₈-compounds or perhaps both?). Light is not known to be involved in the fruiting process of A. bisporus. Details on how these factors link to mating type and transcription factors are presently not known.