Group of Basic and Applied Bioengineering, Faculty of Engineering, Autonomous University of Queretaro , El Marques, Mexico.
Physical Metrology, National Metrology Center (CENAM) Km 4.5 Carretera a Los Cues C.P , El Marques, México.
Plant Signal Behav. 2020 Jul 2;15(7):1770489. doi: 10.1080/15592324.2020.1770489. Epub 2020 Jun 3.
Plants that experience a lack of sufficient irrigation undergo hydric stress, which causes the modification of their mechanical properties. These changes include a complex network of chemical and physical signals that interact between plant-plant and plant-environment systems in a mechanism that is still not well understood, and that differs among species. This mechanical response implies different levels of vibration when the plant experiences structural modifications from self-hydraulic adjustments of flux exchange at specific frequencies, with these carrying behavioral information. To measure these signals, highly sensitive instrumentation that allows the decoding of displacement velocity and displacement of plants, which is possible through calibrated equipment such as 3D scanning laser vibrometers, is necessary. Laser vibrometry technology allows for noninvasive measurements in real-time. Physiological changes could reasonably affect the biomechanical condition of plants in terms of the frequency (hertz) and intensity of the plant's vibration. In this research, it is proposed that the frequency changes of a plant's vibration are related to the plant's hydric condition and that these frequency vibrations have the ecological potential to communicate water changes and levels of hydric stress. The peak of the velocity of plant displacements was found to vary from 0.079 to 1.74 mm/s, and natural frequencies (hertz) range is between 1.8 and 2.6 Hz for plants with low hydric stress (LHS), between 1.3 and 1.6 Hz for plants with medium hydric stress (MHS), and between 6.7 and 7.8 Hz for plants with high hydric stress. These values could act as preliminary references for water management using noninvasive techniques and, knowledge of the range of natural frequencies of hydric stress risk in chili pepper crops can be applied in precision agriculture practices.
经历水分不足的植物会经历水力胁迫，这会导致它们的机械特性发生变化。这些变化包括植物-植物和植物-环境系统之间相互作用的复杂化学和物理信号网络，其机制尚未得到很好的理解，并且在不同物种之间存在差异。这种机械响应意味着当植物经历结构修改时，会在特定频率下经历自我水力调整通量交换的复杂网络，这些频率携带有行为信息。为了测量这些信号，需要使用高度敏感的仪器来解码植物的位移速度和位移，这可以通过校准设备（如 3D 扫描激光测振仪）来实现。激光测振技术允许实时进行非侵入式测量。生理变化可能会合理地影响植物的生物力学状况，包括植物振动的频率（赫兹）和强度。在这项研究中，提出了植物振动频率的变化与植物的水分状况有关，并且这些频率振动具有传递水分变化和水分胁迫水平的生态潜力。发现植物位移速度的峰值变化范围为 0.079 至 1.74mm/s，自然频率（赫兹）范围为低水分胁迫（LHS）植物的 1.8 至 2.6Hz，中等水分胁迫（MHS）植物的 1.3 至 1.6Hz，以及高水分胁迫（HHS）植物的 6.7 至 7.8Hz。这些值可以作为使用非侵入性技术进行水分管理的初步参考，并且可以将辣椒作物水力胁迫风险的自然频率范围的知识应用于精准农业实践中。
