Screening for temperature tolerance of some Aspergillus spp.

Three species of Aspergillus viz., A. fumigatus, A. nidulans and A. sparsus were isolated from different substrates at high temperature (45 oC) and were subjected for thermotolerance screening. Fresh and dry weight, absorbance by extract/spore suspension, spore count and enzyme activity were the parameters used to evaluate fungal species under different temperatures regimes i.e. 25±2 oC, 40±2 oC, 50±2 oC and 60±2 oC. Maximum thermotolerance was observed in A. fumigatus then A. sparsus and A. nidulans.