Plant Physiology 64:1000-1004 (1979)
© 1979 American Society of Plant Biologists
Articles
Effects of Temperature Perturbations on Circadian Conidiation in Neurospora1
Cynthia D. Francis and
Malcolm L. Sargent2
a Departments of Botany, and Genetics and Development, University of Illinois, Urbana, Illinois 61801
Studies on the circadian rhythm of conidiation in the bd strain of Neurospora crassa Shear and Dodge have shown that temperature step-up and step-down perturbations produce phase advances and delays, respectively. Pulse-up and pulse-down treatments lead to both phase advances and delays. The resulting phase shifts can be very large, and few to no transients are observed.
Small amplitude temperature cycles are capable of entraining the circadian rhythm, and holding bd at low temperatures appears to stop the circadian oscillator late in the subjective night (circadian time 2200). Aspects of the temperature responses that are somewhat unusual include the high sensivity, the lack of transients, and the phase at which the oscillator stops under low temperatures.
2 Author to whom reprint requests should be addressed.
1 This work was supported by National Institute of General Medical Sciences Grant GM 16541.
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