In contrast to the yellowish colonies of the wild-type, Δ
chsA mutant, and Δ chsC mutant strains, the color
of which resulted from the pigmented conidia, a newly derived Δ
chsA Δ chsC double mutant (A237SΔAC mutant)
formed whitish colonies, indicating that they produced few conidia
(Fig. 5 a).