Summary: C-Labelled conidia incubated at 2 °C or 22 °C released a glucose-rich exudate, primarily during the first 30 min after wetting. There was no evidence that this exudate was required for germination. Conidia first incubated for 2-8 h on soil or in a model system imposing fungistasis (where exudation occurred), and then transferred to germination-conducive conditions, germinated as rapidly as conidia held constantly in a conducive environment. Exudate applied exogenously did not consistently stimulate germination, and uptake of C-labelled exudate was not detected before germ tubes emerged. Germination was not stimulated by brief exposures to glucose during the period of greatest exudate release, and glucose oxidase did not reduce germination. The results suggest that the initial loss of the glucose-rich exudate cannot directly account for the inhibition of germination of nutrient-independent propagules in soil.


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