Increases winter hardiness of plants when accumulating in a cell?

The accumulation of sugars in the cell and a decrease in the starch content in it. It is worth knowing that winter hardiness and frost resistance of plants develops in plants only by the beginning of the winter period. For example, winter rye can survive frosts down to minus thirty degrees. As a rule, winter crops are sown in the fall. Winter wheat can withstand temperatures down to minus twenty-five degrees.