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Plant Physiology 66:1106-1109 (1980)
© 1980 American Society of Plant Biologists

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Articles

Ethylene: Indicator but Not Inducer of Phytoalexin Synthesis in Soybean 1

Inge Paradies, Jörg R. Konze and Erich F. Elstner2

Jack Paxton

Institut für Botanik und Mikrobiologie, Technische Universität München, D-8000 München, Federal Republic of Germany, Department of Plant Pathology, University of Illinois, Urbana, Illinois 61801

Cell wall preparations (elicitors) from Phytophthora megasperma var. sojae increase C2H4 formation, phenylalanine ammonia lyase activity, and glyceollin accumulation in soybean cotyledons within about 1.5, 3, and 6 hours after treatment, respectively. The immediate precursor of C2H4, 1-aminocyclopropane-1-carboxylic acid, stimulates C2H4 formation like the elicitor within 1.5 hours after administration, whereas phenylalanine ammonia lyase activity and glyceollin concentration remain unchanged. Aminoethoxyvinylglycine, a specific inhibitor of C2H4 formation in higher plants, inhibits elicitor-induced C2H4 formation by about 95% but has no effects on phenylalanine ammonia lyase or glyceollin accumulation. It was concluded that C2H4 is a signal accompanying the specific recognition process which finally leads to the induction of phytoalexin formation, but it is not functioning as a link or messenger in the induction sequence of glyceollin accumulation.

2 To whom reprint requests should be addressed.

1 This research was supported by the Deutsche Forschungsgemeinschaft.




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G. F. Birkenmeier and C. A. Ryan
Wound Signaling in Tomato Plants . Evidence That ABA Is Not a Primary Signal for Defense Gene Activation
Plant Physiology, June 1, 1998; 117(2): 687 - 693.
[Abstract] [Full Text]


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