Effects of light and temperature on sporangiophore initiation inPilobolus crystallinus(Wiggers) Tode

摘要

Sporangiophore initiation inPilobolus crystallinusgrown in white light was induced by either a dark or a low-temperature treatment. The period of darkness necessary to induce sporangiophore initiation was shortened by lowering the temperature. Arrhenius plots for the sporangiophore-suppressing reaction in both light and darkness consisted of two straight lines with a Q10of about 2 at lower temperatures and 8–11 at higher temperatures. The temperature at which the Q10changed was the lower, the higher the fluence rate: 14° C at 8 W/m2, 19.5° C at 0.24 W/m2and 24.5° C in darkness. Possible interpretations of these results are briefly prese