An analysis of long-distance water transport in the soybean stem using H215O

Tomoyuki Ohya, Keitaro Tanoi, Yousuke Hamada, Hirotaka Okabe, Hiroki Rai, Junko Hojo, Kazutoshi Suzuki, Tomoko M. Nakanishi

研究成果: Contribution to journalArticle査読

17 被引用数 (Scopus)


The lateral water movement in the intact stem of a transpiring soybean plant was analyzed quantitatively by a real-time measurement system utilizing labeled water, H215O and gamma ray detectors. A large volume of water escaping from xylem vessels during its transport was detected. The escape of water was not influenced by evaporation from the stem surface or mass flow in the sieve tubes. It was assumed that the total amount of water transported through xylem vessels was kept almost completely constant along the internode. As a result, most of the escaped water was found to re-enter the xylem vessels, i.e. water exchange occurred. The analysis of radiographs of tritiated water suggested that the self-diffusion effect of water was strong for lateral water movement, although another driving force besides thermal motion was included in the process, and that the process was also affected by the water permeability of the plasma membrane. An analysis based on a mathematical model showed that the net volume of water which escaped from xylem vessels was not dependent on the transpiration rate of the plant.

ジャーナルPlant and Cell Physiology
出版ステータス出版済み - 5 2008

All Science Journal Classification (ASJC) codes

  • 生理学
  • 植物科学
  • 細胞生物学


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