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Stimulation of Phenylalanine Ammonia-Lyase Activity and Phytoalexin Production. Lee A. Hadwiger, Department of Plant Pathology, Washington State University, Pullman 99163; Samuel L. Hess(2), and Sharon von Broembsen(3). (2)(3)Department of Plant Pathology, Washington State University, Pullman 99163. Phytopathology 60:332-336. Accepted for publication 17 September 1969. DOI: 10.1094/Phyto-60-332.

Phenylalanine ammonia-lyase (PAL) activity increases in excised pea and bean pod tissue within 8 hr after inoculation with pathogenic and nonpathogenic organisms. Phytoalexin production is correlated with increases in PAL activity. In general, facultative parasites are more potent than obligate parasites in stimulating PAL activity in these tissues. Fungal spore suspensions and chemical compounds that are effective inducers of PAL in pea and bean pod tissue do not significantly stimulate PAL in wheat, corn, and flax seedlings.