ISSN:
1573-5060
Keywords:
disease components
;
eastern cottonwood
;
Melampsora medusae
;
poplar
;
poplar leaf rust
;
Populus deltoides
;
resistance
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Genotypes of eastern cottonwood, Populus deltoides, from Kentucky or Mississippi were inoculated using a leaf disk assay with isolates of poplar leaf rust, Melampsora medusae f. sp. deltoidae (Mmd), from both locations to determine if pathogenic races differ at these locations. Disease severity measurements, including infection probability (number of uredia produced per uredospore), sporulation (number of uredospores/cm2), and the progeny/parent ratio (number of daughter uredia produced per mother uredium) were significantly higher when trees of southern origin were inoculated with isolates from southern locations as compared to isolates from northern locations. In addition, larger variation in disease severity measurements attributable to specific interactions, i.e. the variance due to isolates adjusted for virulence on a universal suscept, were found in northern than in southern isolates. These results suggest that isolates of southern origin have broader adaptation and are more virulent on local southern host genotypes than isolates of northern origin. However, the larger variance attributable to specific interactions in northern isolates indicates the potential for pathogen adaptation to resistant host genotypes in Kentucky.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00036090
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