Effect of glucose on thermotolerance and biocontrol efficacy of the antagonistic yeast Pichia guilliermondii
2014
Sui, Yuan | Liu, Jia
Glucose is widely used as a protectant for biocontrol agents against various stresses during formulation process. However, the information about its effect on thermotolerance and the related mode of action remain largely unknown. In the present study, glucose at 10% (w/v) showed unexpected highly protectant effect on cell viability of the antagonistic yeast, Pichia guilliermondii, exposed to high temperature of 45°C. Compared to non-glucose treatment control, glucose-treated yeast cells showed higher intracellular amounts of glucose, trehalose and ATP in response to heat stress. Moreover, glucose-treated cells had significantly lower ROS accumulation and mitochondrial impairment at 45°C. These results indicate that glucose can protect P. guilliermondii cells from oxidative damage caused by heat stress, resulting in the maintenance of high viability. Importantly, biocontrol efficacy of P. guilliermondii was maintained as well by glucose after high temperature treatment.
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