Water movement in a plant sample by neutron beam analysis as well as positron emission tracer imaging system
Water movement in a plant sample by neutron beam analysis as well as positron emission tracer imaging system
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DOI：
10.1023/a:1022252419649
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发表时间：
2003-01-01
影响因子：
1.6
通讯作者：
Tsiji, A
中科院分区：
文献类型：
--
作者：
Nakanishi, TM;Okuni, Y;Tsiji, A
我们提出了水成像的植物样品的中子束和正电子发射示踪成像系统（PETIS）。前一种方法提供了植物样品中的静态水分剖面以及埋在土壤中的根附近的静态水分剖面。本文不仅介绍了X射线胶片，而且还介绍了利用冷却CCD摄像机的CT方法。通过非破坏性的水图像的X射线胶片，根系的发展以及二维水运动向根进行了分析。空间水图像由180个CT投影图像构建，所述CT投影图像在旋转样品的同时通过CCD相机以一度的间隔拍摄。在大豆根的情况下，有一个水梯度向根在土壤中，并给出了最小值约1毫米远的根表面。随着根系的发育，根系吸水部位逐渐下移。我们还提出了真实的时间水运动的PETIS，水被标记的正电子发射核素，O-15。O-15-水在植物内的运输是相对缓慢的，只有在最低的节间，根和第一叶之间，在20分钟的测量中观察到水的吸收。
We present water imaging of a plant sample both by neutron beam and positron emission tracer imaging system (PETIS). The former method provided static water profile in a plant sample as well as that in the vicinity of a root imbedded in soil. Not only X-ray film but also CT method using a cooled CCD camera is presented. Through non-destructive water image in an X-ray film, root development as well as 2-dimensional water movement toward the root was analyzed. Spatial water image was constructed from 180 CT projection images, taken at an interval of one degree while rotating the sample, through a CCD camera. In the case of a soybean root, there was a water gradient toward a root in soil and gave minimum value at about 1 mm far from the surface of a root. The water absorbing part in a root was gradually shifted downward with the root development. We also present real time water movement by PETIS, where water was labeled with a positron emitting nuclide, O-15. The transportation of O-15-water within a plant was relatively slow and water uptake was observed only at the lowest internode, between a root and the first leaf, during 20-minute measurement.