|Goodwin, Stephen - Steve|
Submitted to: National American Phytopathology Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 4/14/2006
Publication Date: 8/27/2006
Citation: Adhikari, T., Ali, S., Burlakoti, R.R., Chhetri, B.P., Goodwin, S.B. 2006. Genetic variation in stagonospora nodorum in the north central united states. [abstract] Phytopathology. 96:S3.
Technical Abstract: Stagonospora nodorum blotch (SNB) is an economically important foliar and glume disease of wheat worldwide. This disease is widely distributed in the north central, where epidemics occur sporadically. More than 300 isolates collected from spring and winter wheat were analyzed for mating type frequency and distribution using polymerase chain reaction amplification of the mating type locus. Both mating types were distributed in the populations. Among the 11 microsatellite markers tested, six were highly polymorphic with from 2 to 15 alleles per locus. A subset of 40 isolates from North Dakota was selected randomly and inoculated onto two resistant (Erik and Salamouni) and two susceptible (Alsen and ND495) wheat cultivars. The ability of isolates to cause disease, as measured by lesion type (presence or absence of visible lesions), and percent necrotic leaf area was collectively interpreted as aggressiveness. The isolates were significantly different in aggressiveness, but less aggressive on the resistant cultivars as compared to the susceptible cultivars. The cultivar × isolate interaction for aggressiveness also was significant, indicating a possibility of specificity. Data on genotypic diversity will be presented.