摘要
1 Introduction Since differential thermal analysis(DTA) was used to detect a specific exothermic event associated with cold injury, organic supercooling has been reported in over 240 species of 33 angiospermous families and one gymnospermous family. Several hypotheses about the mechanism of the supercooling of flower buds have been proposed, e.g. lower water potential, tissue compactness, ice nucleation factors and the tissue barrier against
