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Plant Physiol. Sep 1989; 91(1): 23–27.
PMCID: PMC1061945

Abscisic Acid Suppression of Phenylalanine Ammonia-Lyase Activity and mRNA, and Resistance of Soybeans to Phytophthora megasperma f.sp. glycinea1


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.

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Selected References

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  • Ayers AR, Ebel J, Finelli F, Berger N, Albersheim P. Host-Pathogen Interactions: IX. Quantitative Assays of Elicitor Activity and Characterization of the Elicitor Present in the Extracellular Medium of Cultures of Phytophthora megasperma var. sojae. Plant Physiol. 1976 May;57(5):751–759. [PMC free article] [PubMed]
  • Edwards K, Cramer CL, Bolwell GP, Dixon RA, Schuch W, Lamb CJ. Rapid transient induction of phenylalanine ammonia-lyase mRNA in elicitor-treated bean cells. Proc Natl Acad Sci U S A. 1985 Oct;82(20):6731–6735. [PMC free article] [PubMed]
  • Hahn MG, Darvill AG, Albersheim P. Host-Pathogen Interactions : XIX. THE ENDOGENOUS ELICITOR, A FRAGMENT OF A PLANT CELL WALL POLYSACCHARIDE THAT ELICITS PHYTOALEXIN ACCUMULATION IN SOYBEANS. Plant Physiol. 1981 Nov;68(5):1161–1169. [PMC free article] [PubMed]
  • Kimpel JA, Kosuge T. Metabolic Regulation during Glyceollin Biosynthesis in Green Soybean Hypocotyls. Plant Physiol. 1985 Jan;77(1):1–7. [PMC free article] [PubMed]
  • Lamb CJ, Merritt TK, Butt VS. Synthesis and removal of phenylalanine ammonia-lyase activity in illuminated discs of potato tuber parenchyme. Biochim Biophys Acta. 1979 Jan 18;582(2):196–212. [PubMed]
  • Paradies I, Konze JR, Elstner EF. Ethylene: indicator but not inducer of phytoalexin synthesis in soybean. Plant Physiol. 1980 Dec;66(6):1106–1109. [PMC free article] [PubMed]

Articles from Plant Physiology are provided here courtesy of American Society of Plant Biologists


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