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Cyto physiological research on sporogenesis in coprinus congregatus an introduction to the study of meiosis under varying light and temperature conditions



Cyto physiological research on sporogenesis in coprinus congregatus an introduction to the study of meiosis under varying light and temperature conditions



Cryptogamie Mycologie 3(4): 391-408



The nuclear behavior of hymenial cells and the physiological stages of development of C. congregatus fruiting bodies are correlatively determined by daily light and dark periods. Primordia development was characterized at a standard temperature of 25.degree. C by the following successive phases: a first photo-stimulated phase (2.5-3.5 days); a photo-inhibited phase (4 or 5 h of minimum darkness), this dark period can be substituted by a lowering of the temperature (e.g., 25 to 10.degree. C for 6 h); a 2nd photo-stimulated phase (few hours); and a photo-insensitive phase. Statistical analysis of meiosis and a comparison of cytological and morphological development of the fruiting bodies were conducted. Light provided at the end of the first photo-stimulated phase is necessary for meiosis initiation. Lowering the temperature suppressed meiotic arrest at the nuclear fusion stage in the absence of the photo-inhibited phase. The kinetics of meiosis were similar whether darkness or a lower temperature was applied to satisfy the photo-inhibited phase.

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