Quantitative analysis of transpiration stream dynamics in an intact cucumber stem by a heat flux control method.
Quantitative analysis of transpiration stream dynamics in an intact cucumber stem by a heat flux control method.
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通过热通量控制方法对完整黄瓜茎中的蒸腾流动力学进行定量分析。
DOI：
10.1104/pp.89.2.643
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发表时间：
1989
期刊：
影响因子：
7.4
通讯作者：
H. Eguchi
中科院分区：
文献类型：
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作者：
M. Kitano;H. Eguchi
采用新型热通量控制方法系统测量了 10 叶期黄瓜植物 (Cucumis sativus L. cv. Chojitsu-Ochiai) 完整茎中蒸腾流的水通量，分辨率为 1 x 10(-3) 克每秒，时间常数为 1 分钟；两个热通量控制传感器连接到第七个节间和茎基部。当植物暴露在光照下时，蒸腾流对叶片蒸腾和根吸水有明显的响应，茎基部的水通量与稳态下每株植物的蒸腾速率相对应。根系吸水滞后于叶片蒸腾约10分钟。水通量动态受根部吸水滞后影响，叶片蒸腾量快速增加造成的暂时失水被茎部约5%的含水量缓冲。
Water flux of transpiration stream in an intact stem of the 10 leaf stage cucumber plant (Cucumis sativus L. cv. Chojitsu-Ochiai) was measured by a novel system of heat flux control method with a resolution of 1 x 10(-3) grams per second and a time constant of 1 minute; two heat flux control sensors were attached to the seventh internode and the stem base. The transpiration stream responded clearly to leaf transpiration and root water absorption when the plant was exposed to light, and the water flux at the stem base corresponded to the transpiration rate per plant in steady state. Root water absorption lagged about 10 minutes behind leaf transpiration. Dynamics of water fluxes were affected by the lag of water absorption in roots, and temporary water loss caused by rapid increase in leaf transpiration was buffered by about 5% of the water content in the stem.
DOI：
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