Abstract—The formation of sporangiophores from mature Phycomyces mycelium is inhibited in a closed system. Irradiation of the mycelium with blue light reverses the inhibition of spordngiophore formation. Dose response curves for this reaction are established for wild type. β‐caroteneless mutants and for mutants that are deficient in phototropism. Phototropic‐negative mutants. altered in genes madA and madB , have a raised threshold in this light reaction. whereas mutants deficient in genes madD to madG are unaffected. β‐caroteneless mutants deficient in genes carA, carB , or carR have a threshold raised by a factor of 100–2000 depending on the amount of residual synthesis of β‐carotene.
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Galland et al. (1979) studied this question.