Abstract
InNeurospora crassa X- and gamma-ray induced inactivation- and reversion-rates for conidia of HNO2 induced mutants were measured. With constant radiation dose inactivation rate is lowest for conidia of medium moisture content. It increases for higher and also for very low moisture content. The semilogarithmic plot of inactivation data for conidia irradiated in suspension or at medium moisture content results in a shouldered curve. A formal analysis using the number of nuclei of multinucleated conidia as numerical reference indicates that ca. 0.5 hits per nucleus are needed to inactivate such a conidium. The data for extremely dry conidia plotted from 0–210 kr likewise closely approximate a single hit curve with a steeper slope than that of the corresponding curve for conidia of medium moisture content.
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