Öhberg, Helena
- Department of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences
Abstract
Two complementary experiments were conducted in a controlled environment to elucidate the interactions between the fungus Sclerotinia trifoliorum Erikss. and red clover (Trifolium pratense L.). In one of these studies, two hardened diploid red clover cultivars (cvs) were inoculated with 20 isolates of S. trifoliorum of various geographic origins. In the other study, 20 red clover cvs, diploid or tetraploid, including late and medium-late flowering types, were inoculated with two isolates of the fungus. Prior to inoculation, some plants were hardened by subjecting them to a low temperature and light treatment mimicking autumn conditions. Late flowering cvs were found more resistant than medium-late ones. Isolates collected in the northern region, where late cvs are grown, were significantly more aggressive than isolates from southern locations, where medium-late cvs are more prevalent. Such an adaptation has not previously been reported for this fungus. This is the first report concerning flowering type and resistance in red clover. Tetraploids were generally not more resistant than diploids. A hardening procedure for red clover plants was found to be a prerequisite for detecting the differences in disease resistance
Keywords
Sclerotinia trifoliorum; Trifolium pratense; hardening; ploidy level; disease resistance
Published in
Journal of Phytopathology
2005, volume: 153, number: 9, pages: 505-511
Publisher: BLACKWELL PUBLISHING
SLU Authors
Bång, Ulla
- Department of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences
- Department of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences
UKÄ Subject classification
Agricultural Science
Publication identifier
- DOI: https://doi.org/10.1111/j.1439-0434.2005.01003.x
Permanent link to this page (URI)
https://res.slu.se/id/publ/6467