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GrainGenes Reference Report: PNA-102-17290

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Reference	PNA-102-17290
Title	Glyphosate inhibits rust diseases in glyphosate-resistant wheat and soybean.
Journal	Proceedings of the National Academy of Sciences, USA
Year	2005
Volume	102
Pages	17290-17295
Author	[ Hide all but 1 of 8 ] Feng PCC Baley GJ Clinton WP Bunkers GJ Alibhai MF Paulitz TC Kidwell KK Feng PC
Abstract	Glyphosate is a broad-spectrum herbicide used for the control of weeds in glyphosate-resistant crops. Glyphosate inhibits 5-enolpyruvyl shikimate 3-phosphate synthase, a key enzyme in the synthesis of aromatic amino acids in plants, fungi, and bacteria. Studies with glyphosate-resistant wheat have shown that glyphosate provided both preventive and curative activities against Puccinia striiformis f. sp. tritici and Puccinia triticina, which cause stripe and leaf rusts, respectively, in wheat. Growth-chamber studies demonstrated wheat rust control at multiple plant growth stages with a glyphosate spray dose typically recommended for weed control. Rust control was absent in formulation controls without glyphosate, dependent on systemic glyphos ate concentrations in leaf tissues, and not mediated through induction of four common systemic acquired resistance genes. A field test with endemic stripe rust inoculum confirmed the activities of glyphosate pre- and postinfestation. Preliminary greenhouse studies also demonstrated that application of glyphosate in glyphosate-resistant soybeans suppressed Asian soybean rust, caused by Phakopsora pachyrhizi.

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