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Race-specific molecules that protect soybeans from Phytophthora megasperma var. sojae

Journal Article · · Proc. Natl. Acad. Sci. U.S.A.; (United States)
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Phytophthora megasperma var. sojae (A. A. Hildebrand) is a fungal stem and root rot-causing pathogen of soybeans. Glycoproteins secreted into the medium of the aseptically cultured fungus have been partially purified by (NH/sub 4/)/sub 2/SO/sub 4/ precipitation and by column chromatography on norleucine-substituted Sepharose 4B and on DEAE-cellulose. Glycoprotein preparations from P. megasperma var. sojae races 1, 2, and 3 have been tested on four cultivars of soybeans. The partially purified glycoproteins from incompatible races of the pathogen (races that cannot successfully infect the plant), but not those from compatible races (races that can kill the plant), protect soybean seedlings from attack by compatible races. The seedlings are protected by introducing the glycoproteins into hypocotyl wounds of seedlings either 90 min prior to or at the time of inoculation of the wounds with mycelia of one of the pathogens. The glycoprotein preparations are poor nonspecific elicitors of phytoalexin accumulation; the glycoproteins have less than 1.0% of the elicitor activity of the glucans present in the mycelial walls of the pathogen.

Research Organization:
Univ. of Colorado, Boulder
OSTI ID:
5474139
Journal Information:
Proc. Natl. Acad. Sci. U.S.A.; (United States), Journal Name: Proc. Natl. Acad. Sci. U.S.A.; (United States) Vol. 76:9; ISSN PNASA
Country of Publication:
United States
Language:
English

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Related Subjects

550400 -- Genetics
550900* -- Pathology
551000 -- Physiological Systems
553000 -- Agriculture & Food Technology
59 BASIC BIOLOGICAL SCIENCES
60 APPLIED LIFE SCIENCES
CARBOHYDRATES
DISEASE RESISTANCE
DISEASES
FUNGI
GENETIC CONTROL
GLUCOPROTEINS
GLYCINE HISPIDA
IMMUNE REACTIONS
INFECTIOUS DISEASES
LEGUMINOSAE
MYCELIUM
ORGANIC COMPOUNDS
PATHOGENESIS
PEST CONTROL
PLANT DISEASES
PLANT TISSUES
PLANTS
PROTEINS
SACCHARIDES
TOLERANCE