Beauveria bassiana is an entomopathogenic fungus that is widely used in Thailand to control
pest insects. However, the increasing temperature has influenced the insect control
efficiency of the fungus. Therefore, determination of thermotolerant isolates of B. bassiana
that can grow and remain pathogenic at higher temperatures than its current optimum
temperature may be a better way to control pest insects in a high temperature environment.
Three isolates of B. bassiana obtained from the Rice Department, Thailand were selected for
mutagenesis using ethyl methanesulfonate (EMS) with subsequent screening at high temperatures
(33 and 35°C). In addition, the recovery of fungal growth after exposure to a high
temperature for a period of time (5–15 days) and then transferring to 25°C was evaluated.
No isolates were found that grew at 35°C but one mutant isolate (BCNT002MT) produced
larger diameter colonies and more spores than the corresponding wild type (WT) at 33°C.
Growth and spore production of the BCNT002MT isolate were greater than its WT when
incubated at 25°C for 14 days following exposure to 33°C for 7 days. In addition, the spore
germination level (%) of BCNT002MT was significantly higher than its WT during culture
at 25°C after prior exposure to 33°C for 5, 10 and 15 days. The pathogenicity against the
brown planthopper, Nilaparvata lugens (Stål), of this mutant isolate was also prominent.
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