Plant Physiology 91:23-27 (1989)
© 1989 American Society of Plant Biologists
Microbe-Plant Interactions
Abscisic Acid Suppression of Phenylalanine Ammonia-Lyase Activity and mRNA, and Resistance of Soybeans to Phytophthora megasperma f.sp. glycinea1
Edmund W. B. Ward,
David M. Cahill and
Madan K. Bhattacharyya
Research Centre, Agriculture Canada, London, Ontario, N6G 2V4, Canada,
AFRC, Institute of Plant Science Research, John Innes Institute, Colney Lane, Norwich, NR4 7UH, United Kingdom
Etiolated hypocotyls of the resistant soybean (Glycine max [L.] Merr.) cultivar Harosoy 63 became susceptible to Phytophthora megasperma (Drechs.) f.sp. glycinea (Hildeb.) Kuan and Erwin race 1 after treatment with abscisic acid. Susceptibility was expressed by increases in lesion size and a major decrease in accumulation of the isoflavonoid phytoalexin, glyceollin. In untreated hypocotyls, activity of phenylalanine ammonia-lyase and accumulation of mRNA for this enzyme increased rapidly after infection, but these increases were suppressed in abscisic acid-treated hypocotyls. The results suggest the possibility that biosynthesis of glyceollin in the resistance response of soybeans may be controlled at the transcriptional level by changes in abscisic acid concentrations caused by infection.
1 D. M. C. was supported by a grant for basic research from the CIBA-GEIGY Corporation.
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