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Virulence Frequencies Influenced by Host Resistance in the Host‐Pathogen System Wheat‐Powdery Mildew
Author(s) -
Heun M.
Publication year - 1987
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1987.tb00468.x
Subject(s) - biology , powdery mildew , virulence , host (biology) , host resistance , pathogen , resistance (ecology) , mildew , gene , microbiology and biotechnology , botany , ecology , genetics , immunology
The virulence spectrum for different regions in Germany in 1986 shows that only virulences for resistance genes Pm1, 4a, 7, 8 and Ml‐i are common in Northern Germany; in the Southern part only Pm3b and 9 (+ Pm1 + 2) remain effective; the combination Pm2 + 6 is effective within the whole country. The selection pressure of resistance genes on virulences is complex, but was relatively stable under different environmental conditions in 1985 and 1986.