Effects of Glyphosate on Glyceollin Production and the Expression of Resistance toPhytophthora megaspermaf. sp.glycineain Soybean

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Abstract
The phenylalanine ammonia-lyase inhibitors aminooxyacetate and aminooxyphenyl propionate did not block resistance expression or glyceollin accumulation in soybean hypocotyls inoculated with an incompatible race of P. megasperma f. sp. glycinea. However, low, nonphytotoxic concentrations of the herbicide glyphosate (N-phosphonomethyl glycine) effectively inhibited both processes. Glyceollin accumulation accounts for the expression of resistance to incompatible races of the fungus.