Abstract
This study identified and characterized four cadmium-resistant mutants of Neurospora crassa. One of these mutants maps to linkage group II and the other three map to linkage group VII, whereas a naturally occurring resistant trait in a strain from Japan resides at a distinct but unmapped locus. Transport of cadmium into Neurospora cells occurs by more than a single uptake system and involves both energy-dependent and -independent components. The resistant mutants transport cadmium in the same manner as does the cadmium-sensitive wild-type strain. Cadmium resistance in these mutants does not appear to result from an increase in cytosolic heat-stable cadmium-binding proteins. Cadmium does not induce the typical heat-shock response in conidia. Under various growth conditions, each of the mutants exhibited morphological alterations, possibly involving the cell wall or plasma membrane.
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