Plant Physiol. Drug Metab Dispos
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Plant Physiology 53:928-930 (1974)
© 1974 American Society of Plant Biologists

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A Direct Comparison between Circadian and Noncircadian Rhythms in Neurospora crassa1

Jerry F. Feldman and Marian N. Hoyle

a Department of Biological Sciences, State University of New York at Albany, Albany, New York 12222

A method has been devised for observing both circadian and noncircadian rhythms in a single wild type strain of Neurospora crassa. This method allows a direct comparison of the properties of the two types of rhythm. The circadian rhythm of conidiation always entrains to a light-dark cycle, damps out in constant light, and has a temperature-compensated period length. The noncircadian rhythm of hyphal branching, expressed by the same strain under different environmental conditions, does not entrain to a light-dark cycle, persists in constant light, and its period length is temperature-dependent. These results suggest that the two rhythms have different underlying mechanisms and demonstrate that the differences in the rhythms previously observed in different strains (patch, band, and clock) are not due to genetic differences between these strains but rather are inherent properties of the rhythms themselves.

1 This work supported in part by Research Grant GM-19850 from the National Institute of General Medical Sciences.




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[Abstract] [PDF]


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Copyright © 1974 by the American Society of Plant Biologists