Cold tolerance in plants

If you are a gardener in an area with cold winters, you will know that most plants do not grow over the winter and survive the conditions in a dormant state. The first cold snap will kill off flowering annuals, which then overwinter as seeds. Early growth in the spring will be destroyed by a late frost and so careful gardeners will cover the emerging shoots of their early potatoes with earth to protect them. Plants are subjected to chilling stress at temperatures in the range 0-15 C and to...