Plants as Phytosensors: Physiological Responses of a Woody Plant in Response to RDX Exposure and Potential for Remote Detection
Plants as Phytosensors: Physiological Responses of a Woody Plant in Response to RDX Exposure and Potential for Remote Detection
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植物作为植物传感器：木本植物对 RDX 暴露的生理反应和远程检测的潜力
DOI：
10.1086/667608
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发表时间：
2012
影响因子：
2.3
通讯作者：
J. Zinnert
中科院分区：
文献类型：
--
作者：
J. Zinnert
利用植物作为植物传感器可以大规模探测爆炸物和其他人为污染。定量植物对六氢-1,3,5-三硝基-1,3,5-三嗪（RDX）污染的生理、光合和高光谱响应为理解植物信号提供了基础。在RDX浓度为100至1500 mg kg - 1的土壤中盆栽木本灌木halimifolia（许多军事设施中常见的一种多能植物）的植物。在所有处理水平上，RDX对气孔导度和光合作用的生理测量均有显著影响，但对水势没有总体影响。光合作用和气孔导度的下降与自然胁迫下明显不同。量子利用效率（）和电子传递速率表明，rdx处理植株的光系统II （PSII）功能正常，光合反应中心活跃。因此，光合作用的下降是由不依赖光的过程中的生化功能障碍引起的。近红外区的反射率指数（、、和衍生指数）受影响最大，可能反映了RDX在植物内被液泡、细胞壁或木质素区隔的途径。这些结果证明了利用植物作为植物传感器来识别远距离爆炸物暴露的潜力。
Using plants as phytosensors could allow for large-scale detection of explosives and other anthropogenic contamination. Quantifying physiological, photosynthetic, and hyperspectral responses of plants to hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) contamination provides the basis for understanding plant signals for remote detection. Plants of the woody shrub Baccharis halimifolia (a generalist species common on many military installations) were potted in soil concentrations of RDX ranging from 100 to 1500 mg kg−1. Physiological measurements of stomatal conductance and photosynthesis were significantly affected by RDX exposure at all treatment levels, with no overall effect on water potential. However, declines in photosynthesis and stomatal conductance were markedly different from those that occur under natural stress. Quantum use efficiency () and electron transport rate indicated that photosystem II (PSII) of RDX-treated plants was functional, with active photosynthetic reaction centers. Thus, declines in photosynthesis resulted from biochemical dysfunction in light-independent processes. Reflectance indices in the near-infrared region (, , and derivative indices) were most affected and may reflect the pathway on which RDX is contained within plants by being compartmentalized in the vacuole, cell wall, or lignin. These results demonstrate the potential for using plants as phytosensors to identify explosives exposure at remote distances.