Phytotoxicity of fenitrothion to white pine seeds and seedlings

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Abstract
Seeds of white pine (Pinusstrobus L.) were stratified in water or a water–fenitrothion emulsion. Two concentrations of fenitrothion were used: 10ppm (equivalent to an approved field concentration) and 1000 ppm. Some toxicological changes were associated with the higher concentration of fenitrothion alone, others were associated with both concentrations of the insecticide. More water was imbibed by seeds treated with 1000 ppm and the amounts and distribution of basic proteins were mainly changed at the higher level of fenitrothion exposure. Cytological studies indicated that succinic dehydrogenases and the esterases were also affected by the lower field concentration of fenitrothion, especially in the hypocotyl region of the embryo. There was no apparent effect on the total insoluble polysaccharides or on DNA metabolism during the first 10 days of growth following either treatment. Although toxicological changes were associated with exposure to fenitrothion, no detrimental long-term effects were observed.

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