Accession Number ADA567433
Title Remote Detection of Plant Physiological Responses to TNT Soil Contamination.
Publication Date 2010
Media Count 13p
Personal Author D. R. Young J. C. Naumann J. E. Anderson
Abstract Our study was aimed at understanding physiological responses to trinitrotoluene (TNT) soil contamination, and using optical methods to detect TNT-induced stress in a woody plant prior to visible changes. Myrica cerifera plants were potted in soil concentrations of TNT ranging from 30:500 mg kg-1. Physiological measurements were significantly affected by TNT exposure at all treatment levels, and photosynthetic decline likely resulted from metabolic impairment rather than stomatal closure as the experiment progressed. Several reflectance indices were able to detect TNT-induced stress before any changes in chlorophyll concentrations occurred. The most sensitive index was the simple ratio R761/R757 which is linked to fluorescence in-filling of the 02 atmospheric absorption. Changes at R740/R850 and R735/R850 may be attributed to both fluorescence and structural characteristics of leaf anatomy in the near infrared region. This could have been influenced by transformation and conjugation of TNT metabolites with other compounds. chlorophyll index (CHL) or in the water band index (WBI970), which are indices typically associated with drought stress, and may provide a means of separating stress due to explosives. Further studies need to be conducted with a combination of stressors (TNT and natural) to determine if responses are in fact generalized or if any of these changes are separable from natural stress.
Keywords Atmospheric attenuation
Chlorophyll fluorescence
Chlorophylls
Contamination
Drought
Exposure(General)
Fluorescence
Hyperspectral reflectance
Near infrared radiation
Optical properties
Photosynthesis
Physiological effects
Physiology
Plants(Botany)
Potting
Ratios
Reflectance
Regions
Remote detection
Reprints
Response
Response(Biology)
Sensitivity
Soils
Stress(Physiology)
Tnt


 
Source Agency Non Paid ADAS
NTIS Subject Category 98A - Agricultural Chemistry
57C - Botany
57Z - Zoology
79A - Ammunition, Explosives, & Pyrotechnics
Corporate Author Virginia Commonwealth Univ., Richmond.
Document Type Journal article
Title Note Journal article.
NTIS Issue Number 1309
Contract Number W911NF-06-1-0074

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