Effect of Strontium Replacement for Calcium on Production of Motile Cells in <i>Protosiphon</i>

Abstract

Protosiphon botryoides Klebs grows without evident zoosporogenesis in inorganic media in which strontium is substituted for calcium. Growth is 50 to 90 percent of that obtained with calcium; when sodium is substituted for calcium, there is no appreciable growth. Motility was observed at or above CaCl(2). 2H(2)O levels of 5 mg/lit., with or without strontium.