Arctic Life/Arctic Fungi/Im Not Thirsty

From Arctic Bioscan Wiki

In the polar deserts of Canada's High Arctic, the lack of water is a constant threat to survival. However, xerophilic fungi are capable of survival and growth during periods of water stress. In fact, some of these fungi can thrive with water activity (water available in the substrate for use) as low as 0.65, whereas most vascular plants wilt when water activity falls below 0.98! This tolerance of water scarcity is aided by compounds such as proline, glycerol, and mannitol, which enable enzymes to function efficiently under water stress.