Sugar transport in Neurospora conidia: Influence of pH and starvation

Summary Uptake of ¹⁴C-sorbose and ¹⁴C-3-O-methylglucose by ungerminated conidia of Neurospora crassa was measured by means of the millipore filter technique.Initial rates of uptake of both sorbose and 3-O-methylglucose exemplify a marked dependence on pH of the incubation medium in the range between pH 3.5 and 6.5. The optimal pH for uptake of both sugars is close to 4.75.When ungerminated conidia are starved with buffer for prolonged periods of time prior to assaying their transport capacity, in contrast to findings for germinated conidia and mycelia no de-repression of the glucose-repressible sugar transport system is effectuated.