species required light. However, the most cultivated mushroom
(A. bisporus) produces primordia in the darkness (Kurtzman and
Martinez-Carrera, 2013). Sakamoto et al. (2007) observed that formation
of Flammulina velutipes’s fruiting bodies can be induced
in complete darkness but under these conditions, fruiting bodies
formed elongate stipe, had a poorly developed pileus and lacked a
hymenium, suggesting that they cannot mature in complete darkness.
However, after light treatment of the pinhead fruiting body,
a pileus develops normally immediately, and the stipe also thickens
and becomes increasingly pigmented. Aschan-Aberg showed
that blue light was required for normal basidiomata growth of F.
velutipes (Aschan-Aberg, 1960). Blue light between 400 and 480 nm
was also required for some Coprinus species (Carlile, 1965). Recent
advances infungalphotobiologyusingmolecular tools andgenomic
analysis have shown specific phytochromes, photoreceptor proteins,
transcription factors, light-regulated genes, and to a certain
extent common regulatory pathways leading to mushrooms development
and spore viability. It seems likely that all mushrooms,
which require light, use a common regulatory pathway for basidioma
development (Kurtzman and Martinez-Carrera, 2013). The
formation of primordial for G. spectabilis in the darkness can be a
useful sign. It can be considered as a biological indicator that mushroom
metabolism is ready for fruiting, showing to the mushroom
growers the end ofthe incubation phase. Thus bags can be removed
and blocks can be transferred to the production room.