Abstract
The effects of sublethal treatments of the herbicide glyphosate [ N-(phosphonomethyl)glycine] on the accumulation of shikimate, hydroxybenzoic acids, and hydroxycinnamic acids in Abutilon theophrasti (velvetleaf) were measured. In newly developing tissues (both leaf and flower), the concentrations of shikimate and protocatechuate were greatly increased by the herbicide, whereas hydroxybenzaldehyde and p-coumarate levels were decreased. During recovery from glyphosate treatment there was a rapid loss of protocatechuate and the levels of other phenolic acids rapidly returned to normal. These indicate that phenolic acid pools in higher plants are regulated and that simple phenolic acids do not accumulate as end products.
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