Changes in supercooling and freezing processes accompanying leaf maturation in Buxus
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The influence of maturity and size on freezing temperatures of intact leaves of Buxus was investigated from the standpoint of nucleation theory. During active leaf growth the extent of supercooling was dependent on the degree of leaf maturity, but was unaffected by leaf size. After leaves were fully matured, the effect of leaf size predominated in supercooling. In general, the greatest supercooling was seen in semi-mature leaves; this gradually decreased as maturity advanced. This change in supercooling during active leaf growth corresponded closely to changes in the freezing pattern, especially to a gradual transition of ice nucleation sites to the apical part of the mid-vein. These two correlative changes are probably dependent on structural changes in tracheary elements that accompany maturation. Age-induced changes in supercooling in growing leaves are dependent on qualitative aspects of nucleators, whereas size-induced changes in mature leaves are dependent on quantitative aspects of nucleators.
- 日本植物生理学会の論文
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