Photosynthetic parameters as indicators of trinitrotoluene (TNT) inhibitory effect: Change in chlorophyll a fluorescence induction upon exposure of Lactuca sativa to TNT

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DOIResolve DOI: http://doi.org/10.1007/s10646-006-0065-5
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TypeArticle
Journal titleEcotoxicology
Volume15
Issue5
Pages437441; # of pages: 5
SubjectTrinitrotoluene toxicity; Lactuca sativa; Bioassay; Chlorophyll a fluorescence; PAM fluorometry; PEA fluorometry; Fluorescence
AbstractTrinitrotoluene, as a compound of conventional explosive, may cause inhibitory effect on terrestrial plants. When Lactuca sativa was exposed to different concentrations of trinitrotoluene (32-1000 mg/kg), photosynthetic process was investigated by using rapid chlorophyll fluorescence kinetic and pulse modulated fluorometry. The decrease of chlorophyll a variable fluorescence was seen to be caused by the deactivation of photosystem II reaction centers. We found for rapid variable fluorescence to be a useful indicator to evaluate the inhibitory effect of trinitrotoluene on photosystem II primary photochemistry and electron transport. The fluorescence parameters, related to the reduction state of photosystem II and to non-photochemical dissipation of light energy, showed a strong relation between the inhibitory effect of photosystem II activity and concentration of trinitrotoluene. The change of photosynthetic fluorescence parameters induced by trinitrotoluene was a reliable indication of the plant physiological state. We proposed for the reduction state of photosystem II and the non-photochemical energy dissipation to be a useful tool in bioassay toxicity testing of trinitrotoluene polluted soil.
Publication date
AffiliationNRC Biotechnology Research Institute; National Research Council Canada
Peer reviewedNo
NRC number49005
NPARC number3538929
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Record identifiere76d6e7b-8596-42f0-929e-68f495b85c6b
Record created2009-03-01
Record modified2016-05-09
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