Title: Elicitation of Phytoalexin Synthesis in Soybean (Glycine Max) by A Fungal Pathogen and a Fungal ß-Glucan
Abstract: One inducible defence mechanism of soybean (Glycine max L. Merrill) against potential pathogens is the production of isoflavonoid phytoalexins at the site of attempted infection (Ebel 1986; Ebel and Grisebach 1988). Mechanisms underlying phytoalexin formation in this plant and their role in defence have been studied in some detail in two experimental systems. One utilizes the inoculation of soybean primary roots with zoospores of the fungal pathogen Phytophthora megasperma f. sp. glycinea, the causal agent of root and stem rot, and mimics the natural infection process. The second experimental system uses cell-suspension cultures and a ß-glucan elicitor isolated from P. megasperma cell walls and represents a system of reduced complexity. Fungus-induced phytoalexin synthesis in roots has been analyzed in relation to fungal race:plant cultivar-specific resistance and to the regulation of phytoalexin accumulation. The analysis of the elicitor-cell culture interaction may provide valuable information on the molecular basis of the initial recognition event between fungus-derived components and the plant cell surfaee and the subsequent steps involved in the transduction of the primary signal. Different soybean tissues have been used to characterize plasma membrane-associated ß-glucan binding proteins which could be related to putative elicitor “receptors”. These studies may, thus, help to understand the nature of the hypothetical “recognition” event between the whole plant and the live pathogen preceding the activation of plant defence responses.
Publication Year: 1989
Publication Date: 1989-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 1
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