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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Uptake and Transport of Positron-emitting Tracer (↑(18)F) in Plants
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Uptake and Transport of Positron-emitting Tracer (↑(18)F) in Plants

机译：正电子发射示踪剂（↑（18）F）在植物中的吸收和运输

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The transport of a positron-emitting isotope introduced into a plant was dynamically followed by a special observation apparatus called 'Positron-Emitting Tracer Imaging System' to observe the damage and recovery functions of plants in vivo. in the system, annihilation γ-rays from the positron emitter are detected with two planar detectors (5 ×6 cm↑(2)). The water containing ca. 5 MBq/ml of ↑(18)F was fed to the cut stem of soybean for 2 rain and then the images of tracer activity were recorded for 30-50 min. When the midrib of a leaf near the petiole was cut just before measurement, the activity in the injured leaf was decreased but detected even at the apex. This result suggests that the damaged leaf recovered the uptake of water through the lamina. Maximum tracer activities in leaves of unirradiated plant were observed within 10 min, whereas those of irradiated plant at 100 Gy were observed after over 25 min. The final activity of irradiated plant after 30 min was lower than that of unirradiated plant. In case of beans, there was a difference in the absorption behavior of the ↑(18)F-labeled water between unirradiated and irradiated samples. These results show that the system is effective to observe the uptake and transportation of water containing positron emitting tracer for the study of damage and recovery functions of plants. #1997 Elsevier Science Ltd
机译：引入植物的正电子发射同位素的运输动态地跟随着称为“正电子发射示踪剂成像系统”的特殊观察装置，以观察植物在体内的破坏和恢复功能。在该系统中，用两个平面探测器（5×6 cm↑（2））探测到来自正电子发射器的an灭γ射线。水中约含将5 MBq / ml的↑（18）F喂入切下的大豆茎中2分钟，然后记录示踪剂活性图像30-50分钟。当刚好在测量前切开叶柄附近的叶片的中脉时，受伤叶片的活性降低，但即使在顶点也能检测到。该结果表明，受损的叶片通过叶片恢复了对水分的吸收。在10分钟内观察到未辐照植物叶片的最大示踪剂活性，而在25分钟后观察到100 Gy辐照植物的示踪剂最大活性。 30分钟后辐照植物的最终活性低于未辐照植物。对于豆类，未经辐照和经辐照的样品在↑（18）F标记的水上的吸收行为有所不同。这些结果表明，该系统可有效观察含正电子的示踪剂对水的吸收和运输，从而研究植物的破坏和恢复功能。 ＃1997爱思唯尔科学有限公司

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