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Glyphosate‐increased levels of indole‐3‐acetic acid in yellow nutsedge leaves correlate with gentisic acid levels
Author(s) -
Cañal María Jesús,
Tamés Ricardo Sánchez,
Fernández Belén
Publication year - 1987
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1987.tb04360.x
Subject(s) - gentisic acid , glyphosate , auxin , indole 3 acetic acid , chemistry , acetic acid , glycine , phenols , hypocotyl , biochemistry , botany , horticulture , salicylic acid , biology , amino acid , agronomy , gene
The effects of glyphosate [N‐(phosphonomethyl)glycine] on endogenous in‐dole‐3‐acetic acid (IAA) level, IAA oxidase activity, and possible interactions with alterations in phenolic metabolism have been examined in yellow nutsedge ( Cyperus esculentus L.) plants. IAA was quantified by flame ionization detector gas‐chroma‐tography, phenols were quantified by high‐performance liquid chromatography and the auxin protection and the IAA oxidase activities were determined spectrophoto‐metrically and/or polarographically. A significant increase in IAA content was recorded after glyphosate treatment. No IAA oxidase activity was detected in control and treated tissues. Auxin protection activity and gentisic acid were present in all extracts assayed, and their concentrations increased as the rate of glyphosate application increased. Addition of gentisic acid to an extract of control plants increased the auxin protection detected. These findings indicate that the high levels of free IAA in yellow nutsedge leaves after glyphosate application are due to the inhibition of the IAA oxidase activity by increased levels of the IAA‐protecting phenol gentisic acid.