Abstract

Strain CL ofPhysarum polycephalum forms multinucleate plasmodia within clones of uninucleate amoebae. The plasmodia have the same nuclear DNA content as the amoebae. Analysis of plasmodial development, using time-lapse cinematography, showed that binucleate cells were formed as a result of nuclear division in uninucleate cells. Binucleate cells developed into plasmodia by further nuclear divisions and cell fusions. No fusions involving uninucleate cells were observed. A temporary increase in cell and nuclear size occurred at the time of binucleate cell formation.

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