| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2013: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
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| Outline of Final Research Achievements |
Ray parenchyma cells are a proposed pathway for the radial movement of some elements from the sapwood to the heartwood in the tree trunk. However, this function has not been demonstrated. In order to reveal the radial pathway of minerals in the tree trunk, a solution of the stable isotope cesium (Cs) was injected into the outer sapwood of Japanese cedar trees, and its radial movement through the xylem was traced at the cellular level using cryo-scanning electron microscopy/energy-dispersive X-ray spectroscopy (cryo-SEM/EDX) and inductively coupled plasma mass spectrometry (ICP-MS). Our findings provide the experimental facts that Cs is actively moved radially from sapwood toward intermediate wood through the ray parenchyma cells.
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