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Changes in Intracellular pH Are Not Correlated with the Circadian Rhythm of Neurospora

Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138

Intracellular pH (pH_i) was measured during the circadian cycle of Neurospora. Internal pH of Neurospora cultures in liquid medium was assayed by the 5,5-dimethyl-2,4-oxazolidinedione method and gave values for pH_i which were similar to those previously obtained by other workers using pH-microelectrodes with agar-grown cultures. Cytoplasmic pH changed in liquid medium cultures, but these changes were not related to the circadian clock. Furthermore, treatments which raise or lower pH_i do not phase-shift the circadian rhythm. These results indicate that pH_i plays no specific role in regulating the circadian clock of Neurospora.

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