Abstract
The soluble sulfur pool of wild-type Neurospora was examined in extracts from mycelia, conidia, and ascospores. The soluble sulfur pools of the regulatory mutants cys-3 and scon c, and of several cysteineless mutants, were also studied. While the sulfur pool of mycelia is complex, the conidial sulfur pool contains only a few specialized components, including choline- O-sulfate and cysteine. A third component of the conidial pool, also found in mycelia has been shown to contain adenine, guanine, ribose, phosphate, cysteine, and homocysteine. Cys-3 and the other cysteine-less mutants, which are unable to utilize exogenous choline- O-sulfate, were found to contain normal levels of this compound in their conidia. The sulfur pool in conidia of scon c was characterized by normal proportions of each of the components, but the size of the total sulfur pool was significantly altered in this strain. Ascospores were found to contain only choline- O-sulfate (80%) and cysteine (20%) in their soluble sulfur pool, but the presence of some insoluble sulfur storage compound was suggested by an increase in the total size of the soluble sulfur pool observed during spore germination.
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