Malone Michael W, Yoder Jacob, Hunter James F, Espy Michelle A, Dickman Lee T, Nelson Ron O, Vogel Sven C, Sandin Henrik J, Sevanto Sanna
Los Alamos National Laboratory Los Alamos, NM, USA.
Front Plant Sci. 2016 May 6;7:564. doi: 10.3389/fpls.2016.00564. eCollection 2016.
Using a simple low-field NMR system, we monitored water content in a living tree in a greenhouse over 2 months. By continuously running the system, we observed changes in tree water content on a scale of half an hour. The data showed a diurnal change in water content consistent both with previous NMR and biological observations. Neutron imaging experiments show that our NMR signal is primarily due to water being rapidly transported through the plant, and not to other sources of hydrogen, such as water in cytoplasm, or water in cell walls. After accounting for the role of temperature in the observed NMR signal, we demonstrate a change in the diurnal signal behavior due to simulated drought conditions for the tree. These results illustrate the utility of our system to perform noninvasive measurements of tree water content outside of a temperature controlled environment.
我们使用一个简单的低场核磁共振系统，在两个月的时间里监测了温室中一棵活树的含水量。通过持续运行该系统，我们在半小时的时间尺度上观察到了树木含水量的变化。数据显示，含水量的日变化与之前的核磁共振和生物学观测结果一致。中子成像实验表明，我们的核磁共振信号主要是由于水在植物中快速运输，而不是由于其他氢源，如细胞质中的水或细胞壁中的水。在考虑了温度对观测到的核磁共振信号的影响后，我们证明了模拟干旱条件下树木日信号行为的变化。这些结果说明了我们的系统在温度控制环境之外进行树木含水量非侵入性测量的实用性。
