Development Genetics Epigenetics and Enviromental Regulation

xxxii,535 hal,;ill,;27 c

Carbon-dioxide inhibits phorogenesis in phycomyces and blue-light overcomes this inhibition

Carbon dioxide inhibits phorogenesis in Phycomyces as does a gas produced by Phycomyces. We have isolated mutants which are supersensitive (B451, B452) or resistant (B455, B457) to the gas. These mutants are also supersensitive or resistant to CO2. We conclude that the gas is CO2. A pulse of blue, but not red, light overcomes this inhibition. The CO2 sensitive step is completed 5\u201310 h before the appearance of visible sporangiophore initials

Blue light induced differentiation in Phycomyces blakesleeanus : The Blue Light Syndrome

We have heard at this conference that blue light has several effects in many plants and microorganisms. Blue light has several physiological effects in the same organism: Phycomyces blakesleeanus. The oldest effects known are phototropism and a light-induced growth response (for a review see Bergman et al. 1969; Russo and Galland 1979). For thirty years it has been known that blue light also induces \u3b2-carotene (Garton et al. 1951). A few years ago Bergman (1972) showed that short pulses of blue light on a growing mycelium leads to an ordered spatial distribution of the production of sporan-giophores. We have further investigated the action of blue light on the differentiation of Phycomyces