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. 1983 May;72(1):129-33.
doi: 10.1104/pp.72.1.129.

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

C H Johnson  1
Affiliations

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

C H Johnson. Plant Physiol. 1983 May.

Abstract

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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