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Phytotoxicity and accumulation of mercury in tobacco subjected to different exposure routes
Author(s) -
Suszcynsky Elaine M.,
Shann Jodi R.
Publication year - 1995
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620140108
Subject(s) - shoot , mercury (programming language) , phytotoxicity , chemistry , toxicity , horticulture , chloride , mercure , botany , environmental chemistry , biology , analytical chemistry (journal) , organic chemistry , computer science , programming language
Experiments were conducted to study the absorption, phytotoxicity, and internal distribution of mercury (Hg) in tobacco plants ( Nicotiana miersii ) exposed to elemental mercury vapor (Hg 0 ) through the shoot or to ionic mercury (Hg 2+ ) through the root. Tobacco plants grown hydroponically were exposed to varying Hg 0 treatment concentrations (0 to 100 mg/m 3 ) in a specially designed chamber system, examined for visible symptoms of toxicity, and analyzed for Hg content by cold vapor atomic absorption, 1 and 10 d following treatment. In a separate experiment, the roots of hydroponic tobacco plants were exposed to Hg 2+ in the form of a mercury chloride solution (0 to 100 μg/ml) and analyzed for growth changes and Hg content. Accumulation, toxicity response, and Hg distribution differed between the two exposure routes, even when internal Hg concentrations in the treated plants were similar. Plants exposed to Hg 0 accumulated Hg in the shoots with no movement to roots. Visible signs of Hg 0 stress were apparent at 1.0 mg/m 3 exposure levels and greater. Root‐exposed plants showed accumulation of Hg in the roots with movement to the shoots by day 10. Inhibition of root and shoot growth occurred at treatment levels of 1.0 μg/ml and greater with very limited tissue damage at higher treatment levels.