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Glyphosate and shade effects on glyphosate-resistant soybean defense response to Sclerotinia sclerotiorum

Published online by Cambridge University Press:  20 January 2017

Chad D. Lee ,
Donald Penner  and
Ray Hammerschmidt
Chad D. Lee
Affiliation:
Department of Crop and Soil Science, Michigan State University, East Lansing, MI 48824
Ray Hammerschmidt
Affiliation:
Department of Plant Pathology, Michigan State University, East Lansing, MI 48824
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Abstract

Application of glyphosate in combination with planting soybeans in narrow rows is an effective practice for management of weeds in glyphosate-resistant soybean. Farmers in Michigan reported higher levels of Sclerotinia stem rot (caused by Sclerotinia sclerotiorum) in fields of glyphosate-resistant soybean. Studies were conducted to determine if glyphosate or shading reduced the defense response of glyphosate-resistant soybean to S. sclerotiorum. Glyphosate caused shikimate accumulation in glyphosate-susceptible cultivar GL2415 but not in glyphosate-resistant cultivar GL2600RR. Ethylacetate extracts containing the plant defense compound glyceollin inhibited S. sclerotiorum hyphae in a rate-dependent manner. Glyphosate had no effect on either baseline or induced levels of glyceollin in glyphosate-resistant soybean, indicating that glyphosate did not impair plant defense responses to S. sclerotiorum. Shade levels of 60 and 90% in the greenhouse did not inhibit the induction of glyceollin synthesis. Glyphosate herbicide and shading did not affect the glyphosate-resistant soybean defense response to S. sclerotiorum.

Keywords

Glyphosatelactofenshikimatesoybean, Glycine max (L.) Merr. ‘Great Lakes GL2415′, ‘Great Lakes GL2600RR’, and ‘Pioneer 92B71′Sclerotinia stem rot (white mold), Sclerotinia sclerotiorum (Lib.) de BaryGlyceollinglyphosate-resistant soybean
Type
Research Article
Information
Weed Science , Volume 51 , Issue 3 , June 2003 , pp. 294 - 298
Copyright
Copyright © Weed Science Society of America 

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