Study of the tolerance for low temperature of woody plants

木本植物耐低温能力的研究

• 批准号: 13460063
• 负责人: TANGE Takeshi
• 金额: $ 9.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13460063/
• 关键词: Cryptomeria japonica; water relations; Pressure-Volume method; tolerance for low temperature; soil temperature; osmotic adjustment; cell wall elasticity; sink-source relation; 水分生理特性; シンクーソース関係; 植物ホルモン; 耐凍性; 水ストレス; シンク-ソース関係; 浸透ポテンシャル; フェノロ

In temperate evergreen tree species, lowering of the turgor loss point of shoot and of the osmotic potential at full turgor from autumn into winter have been well known. These changes in shoot water relations closely relate to the tolerance to low temperature and frost in winter. We tested a hypothesis that such seasonal change in shoot water relations is driven by root temperature by manipulating temperature of root and shoot of Cryptomeria japonica seedlings separately. In field condition, the lowering of the turgor loss point of shoot becomes clear when the temperature was under 5℃. This change in shoot water relations might represent adaptive responses to increased root hydraulic resistance at low temperature, when the viscosity of water was increased. The lowering of the turgor loss point was accelerated by root cooling and delayed by root warming. However, shoot warming did not give any effect on the shoot water relations under the low root temperature (<5℃) in winter. The change in shoot water relations by root cooling needed about 1 week and was reversible by warming of the seedling or the root. The lowering of the turgor loss point was driven much more by the increasing in cell wall elasticity than by the osmotic adjustment such as increase in sugar content. From these results, we clarified that the changes in the shoot water relations from autumn to winter was the response to the decrease of root (soil) temperature and the adaptive response to the winter cold. It was considered that frost injury of Cryptomeria japonica in late autumn and early spring was occurred under the condition when soil temperature was higher than 5℃.

在温带的常绿植物中，从秋季到冬季的Furgor渗透潜力的繁殖点已经众所周知。芽的水关系是由tomeria japonica幼苗的根部生根温度分别在野外条件下驱动的，当温度低于5°C时，芽的损失点会明确。在低温下，水的降低是通过根冷却来加速的，并通过根变暖延迟射门室的变化大约需要1周，并且通过幼苗或根的变暖是可逆的。 suga r含量的增加，我们从秋季到冬季的射击水关系的变化是对根（土壤）温度降低的反应和对冬季寒冷的自适应反应。当土壤温度高于5°C时，早春发生了早春。

项目成果

Root temperature drives acclimation of shoot water relations to winter in Cryptomeria japonica seedling

根温驱动柳杉幼苗芽水关系对冬季的适应

• 发表时间: 2005
• 期刊: Tree Physiology (in press)
• 作者: NORISADA;M.;HARA;M.;YAGI;H.;TANGE;T.
• 通讯作者: T.