Abstract
AbstractRespiration has been measured in the dark before and after addition of salts to suspensions of Chlorella in distilled water. An immediate and marked, but transient, increase in oxygen uptake rate was observed with several alkali (Na, K, Rb) and heavy metal (Zn, Ce) salts. Comparison of this salt stimulated respiration (S.S.R.) with ion flux rates showed that, in contrast to higher plant cells, with Chlorella no simple relationship exists between S.S.R. and rate of salt uptake. An osmotic effect and direct action of salts with mitochondrial electron transport were excluded as causes of S.S.R. More likely, salt stimulated ATP hydrolysis at the plasmalemma acts upon electron flow to oxygen via respiratory control.
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