Abstract
In Neurospora crassa light signal can affect several morphogenesis including stimulation of carotenoid synthesis in mycelia, and 2)perithecial polarity. We have reported that mutation in nucleoside diphosphate kinase, ndk-1P72H showed lack of perithecial polarity. We present that superoxide and hydrogen peroxide may be included in the process of light signal transduction. Using a mutant in superoxide dismutase (Cu/Zn SOD), sod-1 we detected that the production of carotenoid in sod-1 under light was accelerated compared with that of wild type. The photoreceptor mutant wc-1 and wc-2 showed no production of carotenoid in the mycelia. However, double mutant, wc-1, sod-1 and wc-2 sod-1 did not show stimulation of carotenoid synthesis. The vvd mutation in VVD gene, which suppress the function of wc-1 and wc-2, showed enhanced production of carotenoid in the mycelia. The double mutant, vvd, sod-1 showed additive stimulation of carotenoid synthesis.
