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Photomorphogenesis in Phycomyces: Dependence on environmental conditions

Luis M. Corrochano and Enrique Cerdá-Olmedo
Planta
Vol. 174, No. 3 (1988), pp. 309-314
Published by: Springer
Stable URL: http://www.jstor.org/stable/23379263
Page Count: 6
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Photomorphogenesis in Phycomyces: Dependence on environmental conditions
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Abstract

The production of two kinds of vegetative reproductive structures, microphores and macrophores, by Phycomyces blakesleeanus Bgff. depends on plating density, ventilation, asparagine supply, and illumination. Quantitative determinations of these variables lead us to propose a new experimental system for developmental photobiology: standard plastic Petri plates containing 25 ml minimal medium are inoculated with 105 viable, heat-activated spores and incubated, unpiled and unsealed, at 22° C. After 4 d microphores are counted and macrophores are weighed. Both microphorogenesis and macrophorogenesis are governed by light. Photosensitivity is a developmental phenomenon which occurs 32 to 68 h after inoculation, just before the beginning of vegetative reproduction in the dark controls. The maximum photosensitivity occurs 48 h after inoculation.

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