The Progression of Cavitation in Earlywood Vessels of Fraxinus mandshurica var japonica during Freezing and Thawing.
The Progression of Cavitation in Earlywood Vessels of Fraxinus mandshurica var japonica during Freezing and Thawing.
复制标题
水曲柳早材导管在冻融过程中空化的进展。
DOI：
10.1104/pp.121.3.897
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发表时间：
1999
期刊：
影响因子：
7.4
通讯作者：
Jun Ohtani
中科院分区：
文献类型：
--
作者：
Yasuhiro Utsumi;Y. Sano;Ryo Funada;Seizo Fujikawa;Jun Ohtani
为了研究落叶环状多孔树的大直径早期容器中的空化进程，以水曲柳盆栽幼树为研究对象。被冷冻然后解冻。用冷冻扫描电子显微镜观察了当年早期珍稀动物血管在冻结和解冻过程中管腔内水分含量和分布的变化。当样品被冷冻时，当年的大多数早期器皿都装满了水。在随后的解冻后，当年早期容器的空化百分比随着时间的推移而逐渐增加。当年的所有早期容器都在24小时内出现空化，只有有限的水留在早期容器的管腔中。冷冻切除的茎段解冻后，也观察到早期血管的类似空化现象。相比之下，当年晚材的许多容器在冻结和解冻期间保持了卢米纳的水分。这些观察表明，当年日本沼虾早期血管的空化不是在冻结过程中产生的，而是在冻结后的复温过程中进行的。
For an examination of the progression of cavitation in large-diameter earlywood vessels of a deciduous ring-porous tree, potted saplings of Fraxinus mandshurica var japonica Maxim. were frozen and then thawed. The changes in the amount and distribution of water in the lumina of the current year's earlywood vessels during the course of the freezing and thawing were visualized by cryo-scanning electron microscopy. When samples were frozen, most of the current year's earlywood vessels were filled with water. After the subsequent thawing, the percentage of cavitated current-year earlywood vessels gradually increased with time. All of the current year's earlywood vessels were cavitated within 24 h, and only limited amounts of water remained in the lumina of earlywood vessels. Similar cavitation of earlywood vessels was observed after thawing of frozen, excised stem pieces. In contrast, many vessels of the current year's latewood retained water in the lumina during freezing and thawing. These observations indicate that the cavitation of the current year's earlywood vessels is not produced during freezing but progresses during rewarming after freezing in F. mandshurica var japonica.