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Plants as Phytosensors: Physiological Responses of a Woody Plant in Response to RDX Exposure and Potential for Remote Detection
Julie C. Zinnert
International Journal of Plant Sciences
Vol. 173, No. 9 (November/December 2012), pp. 1005-1014
Published by: The University of Chicago Press
Stable URL: http://www.jstor.org/stable/10.1086/667608
Page Count: 10
You can always find the topics here!Topics: Plants, Infrared reflection, Chlorophylls, Spectral reflectance, Fluorescence, Soil pollution, Reflectance, Explosives, Photosynthesis, Dehydration
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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.
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