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Comparative study of uptake and cellular distribution of Hg203-labeled phenyl-mercuric acetate and mercuric acetate by pea roots

Comparative study of uptake and cellular distribution of Hg203-labeled phenyl-mercuric acetate and mercuric acetate by pea roots

Plant Physiology 41(3): 443-446

Uptake and cellular distribution of Hg203 from dilute mercuric acetate or phenylmercuric acetate (PMA) solutions by excised and intact pea roots (Pisum sativum)were investigated. The time course of uptake showed that the amount of Hg uptake was increased with the time of incubation during an experimental period of 160 minutes, and was similar for inorganic Hg or PMA. With increased concentration of incubating solution a linear increase in the absorption was observed, with no significant difference between PMA and mercuric acetate. When the pea roots were incubated at different temperatures, ranging from 3[degree] to 37[degree], a nonlinear increase in absorption of mercuric acetate was observed with the increase of temperature. In case of PMA the amount absorbed by pea roots was similar to the absorption of mercuric acetate at temperatures between 3[degree] and 23[degree]; the uptake of PMA at 37[degree] was much less. The trend of Hg203 incorporation into cellular components from mercuric acetate and PMA differed greatly as the time of incubation increased. The concentrations or the temperature of incubation also affected the cellular distribution of Hg203. Longer time of exposure or higher concentration resulted in a greater mercury incorporation into mitochondrial fraction from PMA than from mercuric acetate. The difference in intracellular distribution may be responsible for the degree of toxicity between inorganic Hg and PMA in a biological system.

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Accession: 024364977

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PMID: 5906377

DOI: 10.1104/pp.41.3.443

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