查看文章

Light regulates many developmental and physiological processes in a large number of organisms. The best‐known light response in the fungus Mucor circinelloides is the biosynthesis of β‐carotene. Here, we show that M. circinelloides sporangiophores also respond to light, exhibiting a positive phototropism. Analysis of both responses to different light wavelengths within the visible spectrum demonstrated that phototropism is induced by green and blue light, whereas carotenogenesis is only induced by blue light. The blue regulation of both responses suggests the existence of blue‐light photoreceptors in M. circinelloides. Three white collar‐1 genes (mcwc‐1a, mcwc‐1b and mcwc‐1c) coding for proteins showing similarity with the WC‐1 photoreceptor of Neurospora crassa have been identified. All three contain a LOV (light, oxygen or voltage) domain, similar to that present in fungal and plant blue‐light …