Abstract

Glyphosate (N-phosphonomethylglycine) caused a significant decrease or a slight increase in ethylene production in tobacco callus (Nicotiana tabacum L.) depending on the concentration of indole-3-acetic acid (IAA) present in the medium. IAA stimulated ethylene production, but a pretreatment with glyphosate greatly reduced the IAA-induced ethylene production. Inasmuch as glyphosate treatment promoted the metabolism of IAA, the decrease in ethylene production induced by glyphosate is attributed to the rapid loss of free IAA in the treated tissue.

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