Host-Pathogen Interactions : XX. BIOLOGICAL VARIATION IN THE PROTECTION OF SOYBEANS FROM INFECTION BY PHYTOPHTHORA MEGASPERMA F. SP. GLYCINEA |
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| Authors: | Desjardins A E Ross L M Spellman M W Darvill A G Albersheim P |
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| Affiliation: | Department of Chemistry, University of Colorado, Boulder, Colorado 80309. |
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| Abstract: | Phytophthora megasperma f.sp. glycinea, which causes soybean (Glycine max) root and stem rot, exists as several races which differ in their ability to infect a range of soybean cultivars. A glycoprotein-rich fraction (Fraction I) isolated from fungal culture fluid protects soybean seedlings from infection with compatible races. In an early study (13), seedlings were protected only by Fraction I purified from incompatible races. In 1979, seedlings were better protected by Fraction I isolated from incompatible races than by Fraction I isolated from compatible races. In 1980, seedlings were protected equally well by Fraction I from incompatible and compatible races. Materials similar in composition to Fraction I did not protect seedlings from infection. No cause could be identified for the apparent change, during the 3-year period, in the race specificity of the protection assay. Variability in the bioassay prohibited further purification or characterization of Fraction I components that protect seedlings from infection. |
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