Li Denghua, Li Ganqiong, Li Jianzheng, Xu Shiwei
Agricultural Information Institute of Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Key Laboratory of Agricultural Monitoring and Early Warning Technology, Ministry of Agriculture and Rural Affairs, Beijing 100081, China.
Membranes (Basel). 2022 Mar 24;12(4):358. doi: 10.3390/membranes12040358.
Real-time noninvasive monitoring of crop water information is an important basis for water-saving irrigation and precise management. Nano-electronic technology has the potential to enable smart plant sensors to communicate with electronic devices and promote the automatic and accurate distribution of water, fertilizer, and medicine to improve crop productivity. In this work, we present a new flexible graphene oxide (GO)-based noninvasive crop water sensor with high sensitivity, fast responsibility and good bio-interface compatibility. The humidity monitoring sensitivity of the sensor reached 7945 Ω/% RH, and the response time was 20.3 s. We first present the correlation monitoring of crop physiological characteristics by using flexible wearable sensors and photosynthesis systems, and have studied the response and synergistic effect of net photosynthetic rate and transpiration rate of maize plants under different light environments. Results show that in situ real-time sensing of plant transpiration was realized, and the internal water transportation within plants could be monitored dynamically. The synergistic effect of net photosynthetic rate and transpiration of maize plants can be jointly tested. This study provides a new technical method to carry out quantitative monitoring of crop water in the entire life cycle and build smart irrigation systems. Moreover, it holds great potential in studying individual plant biology and could provide basic support to carry out precise monitoring of crop physiological information.
作物水分信息的实时无创监测是节水灌溉和精准管理的重要依据。纳米电子技术有潜力使智能植物传感器与电子设备通信，并促进水、肥料和药物的自动精准分配，以提高作物产量。在这项工作中，我们展示了一种新型的基于柔性氧化石墨烯（GO）的无创作物水分传感器，它具有高灵敏度、快速响应和良好的生物界面兼容性。该传感器的湿度监测灵敏度达到7945 Ω/%RH，响应时间为20.3秒。我们首次利用柔性可穿戴传感器和光合作用系统对作物生理特征进行关联监测，并研究了不同光照环境下玉米植株净光合速率和蒸腾速率的响应及协同效应。结果表明，实现了对植物蒸腾作用的原位实时传感，并且能够动态监测植物体内的水分运输。玉米植株净光合速率和蒸腾作用的协同效应可以共同测试。本研究为在作物整个生命周期内进行作物水分定量监测以及构建智能灌溉系统提供了一种新的技术方法。此外，它在研究单株植物生物学方面具有巨大潜力，并可为开展作物生理信息的精准监测提供基础支持。
