Auxin herbicides: current status of mechanism and mode of action

Pest Management Science - Tập 66 Số 2 - Trang 113-120 - 2010
Klaus Großmann1
1BASF Agricultural Centre Limburgerhof, D‐67117 Limburgerhof, Germany

Tóm tắt

Abstract

Synthetic compounds that act like phytohormonal ‘superauxins’ have been among the most successful herbicides used in agriculture for more than 60 years. These so‐called auxin herbicides are more stable in planta than the main natural auxin, indole‐3‐acetic acid (IAA), and show systemic mobility and selective action, preferentially against dicot weeds in cereal crops. They belong to different chemical classes, which include phenoxycarboxylic acids, benzoic acids, pyridinecarboxylic acids, aromatic carboxymethyl derivatives and quinolinecarboxylic acids. The recent identification of receptors for auxin perception and the discovery of a new hormone interaction in signalling between auxin, ethylene and the upregulation of abscisic acid biosynthesis account for a large part of the repertoire of auxin‐herbicide‐mediated responses, which include growth inhibition, senescence and tissue decay in sensitive dicots. An additional phenomenon is caused by the quinolinecarboxylic acid quinclorac, which also controls grass weeds. Here, the accumulation of phytotoxic levels of tissue cyanide, derived ultimately from quinclorac‐stimulated ethylene biosynthesis, plays a key role in eliciting the herbicidal symptoms in sensitive grasses. Copyright © 2009 Society of Chemical Industry

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Thông tin xuất bản

Pest Management Science

Tập 66 Số 2

113-120

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