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Independence of propagation ability and developmental processes in irradiated cellular slime-moulds.

SummaryWhen assayed for reproductive ability, the cellular slime mould Dictyostelium discoideum NC-4 is resistant to 60Co gamma-rays (D10 = 300 krads) whereas a derived mutant, γs-13, is much more sensitive (D10 = 4 krads). If ability to proceed through development to form normal-appearing spores (a process requiring neither DNA synthesis nor cell division) is assayed after irradiation of amoeboid cells, the γs-13 strain is more sensitive than NC-4, but the differential sensitivity is only about 4× at the 20 per cent level (270 krads for NC-4). When the reproductive ability of these spores is determined, those of γs-13 are mostly inviable at doses above 20 krads, while those of NC-4 are largely viable up to 200 krads. Quantitatively, the proportion of viable spores among those produced closely follows the proportion of viable cells in the irradiated population used to initiate development. The greatest diminution of spore production occurs for irradiation done at the beginning of aggregation; however, the...