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Physiologic Race Changes in Barley Mildew 1964–67
Author(s) -
Wolfe M. S.
Publication year - 1968
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1968.tb00425.x
Subject(s) - mildew , biology , cultivar , race (biology) , powdery mildew , host (biology) , hordeum vulgare , virulence , host resistance , agronomy , veterinary medicine , botany , poaceae , horticulture , gene , ecology , genetics , medicine , immunology
SUMMARY Physiologic race surveys of the populations of Erysiphe graminis f. sp. hordei were made in the years 1964–67. The differential host cultivars used for race determinations were the standard set of 10 barley cultivars used in Europe. In the four years a total of 28 races was identified, 24 of which also occur in other parts of Europe. The race frequencies changed from season to season and this appeared to be dependent upon the acreage of host cultivars with particular resistance genes. The most obvious example was in the case of cv. Impala which possesses the two mildew resistance genes M1g and M1a6. Concurrently with the increase of this cultivar from 0 to 15 per cent of the spring barley acreage between the early 1960's and 1967, the proportion of physiologic races capable of attacking Impala and therefore possessing the two complementary virulence genes Vg and Va6, increased from 0 per cent in 1964 to 75 per cent in 1967 of all barley mildew samples investigated.