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Variation in pathogenicity among field isolates of Phoma exigua var. foveata
Author(s) -
BAIN R. A.,
LENNARD J. H.,
WASTIE R. L.
Publication year - 1987
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1987.tb01457.x
Subject(s) - biology , pathogenicity , axenic , exigua , inoculation , solanaceae , botany , blackleg , pathogen , microbiology and biotechnology , horticulture , genetics , bacteria , spodoptera , gene , brassica , recombinant dna
SUMMARY Experiments carried out using a point inoculation method to infect potato tubers with Phoma exigua var. foveata demonstrated considerable variation in pathogenicity among field isolates. This variation was unlikely to be due to differential reductions in isolate pathogenicities during axenic culture. However, fresh field isolates generally produced larger lesions than stored isolates. An investigation of the distribution of pathogenicity variation in the fungus revealed that differences among isolates from different lesions taken from the same potato stock were greater than those between stocks, but pathogenicity variation within each lesion isolate was small relative to that between isolates. The importance of using isolates with a high level of pathogenicity, hence recent field isolates, in studies of this pathogen is stressed.