FIG. 7.

Viability of conidiospores of wild-type strain NW131 and ΔmpdA strain NW306 upon incubation at 50°C. Suspensions containing approximately 10⁸ spores ml⁻¹ in 0.05% (wt/vol) Tween 80- 0.9% (wt/vol) NaCl were incubated at 50°C for the indicated times. Spore viability was established by diluting aliquots, plating on complete medium containing 1% (wt/vol) glucose, and determining the number of CFU after 24 h of growth at 30°C. Symbols: ▴, wild-type strain NW131; ▪, ΔmpdA strain NW306. Data are averages of two independent determinations and standard deviations.