Changes in supercooling and freezing processes accompanying leaf maturation in Buxus
Changes in supercooling and freezing processes accompanying leaf maturation in Buxus
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黄杨叶成熟过程中过冷和冷冻过程的变化
DOI：
10.1093/oxfordjournals.pcp.a074598
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发表时间：
1971
影响因子：
4.9
通讯作者：
S. Kaku
中科院分区：
文献类型：
--
作者：
S. Kaku
从成核理论的角度，研究了黄杨完整叶片的成熟度和大小对冻结温度的影响。在叶片活跃生长期间，过冷程度取决于叶片的成熟程度，但不受叶片大小的影响。叶片完全成熟后，叶片大小对过冷的影响起主导作用。一般来说，半成熟叶片的过冷程度最大；随着成熟度的提高，这种情况逐渐减少。叶片活跃生长期间的过冷变化与冻结模式的变化密切相关，特别是冰核位置逐渐向中叶脉顶端过渡。这两种相关的变化可能依赖于成熟过程中气管元件的结构变化。生长叶片中年龄诱导的过冷变化取决于成核器的质量方面，而成熟叶片中大小诱导的变化取决于成核器的数量方面。
The influence of maturity and size on freezing temperatures of intact leaves ofBuxuswas 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.