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The host range of isolates of downy mildew, Peronospora parasitica, from Brassica crop species
Author(s) -
SHERRIFF CHRISTINE,
LUCAS J. A.
Publication year - 1990
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.1365-3059.1990.tb02478.x
Subject(s) - downy mildew , biology , host (biology) , brassica , botany , mildew , range (aeronautics) , fungus , virulence , gene , genetics , materials science , composite material
The host ranges of 33 isolates of the downy mildew fungus Peronospora parasitica from different Brassica hosts and diverse geographic origins were assessed on a standard set of Brassica accessions Isolates from each host species had a distinct host range, and in some cases isolates from the same host species but different geographic origins differed in host range. Most isolates were capable of infecting hosts other than their species of origin. These results are discussed in relation to species specificity and the conservation of certain virulence gene combinations. The epidemiological implications for cross‐infection of Brassica hosts by P. parasitica isolates in the field are also considered.