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Detection of Phytoalexin in Soybean Roots. W. A. Meyer, Research Assistant, Department of Plant Pathology, University of Illinois, Urbana 61801; P. N. Thapliyal(2), J. A. Frank(3), and J. B. Sinclair(4). (2)(3)(4)Former Research Assistant; Research Assistant; and Professor, respectively, Department of Plant Pathology, University of Illinois, Urbana 61801, (2)Present address: Department of Plant Pathology, Uttar Pradesh Agricultural University, Pantnagar, Uttar Pradesh, India. Phytopathology 61:584-585. DOI: 10.1094/Phyto-61-584.

Phytoalexin (PA_k) production was demonstrated in fibrous roots of soybean (Glycine max). Amsoy, Harosoy, and Harosoy-63 seedlings were transplanted at 2, 6, and 12 days following germination into sterile, distilled water without or with zoospores of Phytophthora megasperma var. sojae. Analyses of water suspensions at 3 and 7 days following inoculation confirmed the presence of PA_k only in suspensions containing zoospores.