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The Journal of General Physiology, Vol 19, 45-60, Copyright © 1935 by The Rockefeller University Press

ARTICLE

THE REVERSIBLE HEAT ACTIVATION INDUCING GERMINATION AND INCREASED RESPIRATION IN THE ASCOSPORES OF NEUROSPORA TETRASPERMA

David R. Goddard 1

1 From the Laboratories of The Rockefeller Institute for Medical Research, New York, and the Marine Biological Laboratory, Woods Hole

The heat activation of Neurospora tetrasperma ascospores is a reversible process, since activated spores may be returned to secondary dormancy by preventing respiration, and these secondarily dormant spores may be induced to germinate by reheating. Activation of the spores brings about a large increase in respiration prior to the germination of the spores. As the spores are reversibly activated or deactivated the rate of respiration is increased or is decreased. By poisoning the cells with iodoacetamide it is possible to prevent all germination without greatly inhibiting this increase in respiration. Precisely with the beginning of germination a secondary rise in respiration occurs. The respiration of the spores is cyanide sensitive. The heat activation has a critical temperature at about 49 to 52°C.; and at a constant temperature within this range, the percentage of the spores activated as plotted against the time, follows an S-shaped population curve.

Accepted on January 31, 1935


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