Plant Physiology 50:171-175 (1972)
© 1972 American Society of Plant Biologists
Articles
Effects of Medium Composition and Carbon Dioxide on Circadian Conidiation in Neurospora1,2
Malcolm L. Sargent and
Sara H. Kaltenborn
a Department of Botany, University of Illinois, Urbana, Illinois 61801
Efforts to significantly perturb the timing mechanism, and thus the period, of the rhythm responsible for circadian conidiation in bd, a strain of Neurospora crassa, by altering the medium composition have been unsuccessful. Various salt solutions, sugars, and amino acids do, however, have pronounced effects on growth and conidiation, and thus on the expression and persistence of rhythmicity.
Aeration stimulates conidiation in growth-tube cultures, thereby allowing experiments which demonstrate that nearly all strains and species of Neurospora are capable of circadian conidiation. These results extend to Neurospora the generalization that physiological and developmental regulation in all eukaryotic organisms has a circadian component. Aeration also increases the persistence of circadian conidiation suggesting that the damping of rhythmicity previously observed on certain media represents the cessation of conidiation, rather than the stopping of a timing mechanism.
Aeration is apparently effective in that it maintains CO2 levels in growth-tube cultures below a critical concentration. Carbon dioxide was shown to inhibit conidiation in both wildtype and bd strains, with the latter being about 200 times more resistant than the former.
1 This work was supported by a National Institutes of Health grant (GM-16541) to M.L.S. and a National Institutes of Health traineeship to S.H.K.
2 Portions of this work were presented at the Xth International Congress of Microbiology, Mexico City, Mexico in August, 1970.
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