Adaptation of poplar leaf rust to Eastern cottonwood

Euphytica ◽  
1992 ◽  
Vol 62 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Richard C. Hamelin ◽  
Louis Shain ◽  
Bart A. Thielges
Keyword(s):  
Leaf Rust ◽  
Eastern Cottonwood ◽  
Poplar Leaf ◽  
Poplar Leaf Rust

Influence of leaf wetness, temperature, and rain on poplar leaf rust epidemics

1992 ◽  
Vol 22 (9) ◽  
pp. 1249-1254 ◽  
Author(s):  
Richard C. Hamelin ◽  
Louis Shain ◽  
Bart A. Thielges
Keyword(s):  
Leaf Rust ◽  
Limiting Factors ◽  
Leaf Wetness ◽  
Natural Stand ◽  
Eastern Cottonwood ◽  
High Maximum ◽  
Detached Leaves ◽  
Maximum Temperatures ◽  
Poplar Leaf ◽  
Poplar Leaf Rust

Severe epidemics of poplar leaf rust, caused by Melampsoramedusae Thüm. f.sp. deltoidae, developed on eastern cottonwood, Populusdeltoides Bartr., in 1988 and 1989 in a mixed clonal plantation and in a natural stand in western Kentucky despite precipitation deficits and high maximum temperatures during the exponential phase of the epidemic. Minimum temperatures during that period, however, were within the range reported to be optimal for uredospore germination (15–21 °C). Average duration of leaf wetness for the entire epidemic was 10.6 h in 1988, and 11.2 and 11.7 h in 1989 in the natural stand and the plantation, respectively. Maximum infection of artificially inoculated detached leaves of eastern cottonwood occurred after 8 h of continuous leaf wetness. These results suggest that rain deficit and high maximum temperatures are not limiting factors for poplar leaf rust epidemics when night conditions frequently offer optimal temperature and leaf wetness for infection.

scholarly journals Genetic Diversity in Poplar Leaf Rust (Melampsora medusae f. sp. deltoidae) in the Zones of Host Sympatry and Allopatry

2007 ◽  
Vol 97 (5) ◽  
pp. 603-610 ◽  
Author(s):  
M. Bourassa ◽  
L. Bernier ◽  
R. C. Hamelin
Keyword(s):  
Leaf Rust ◽  
Geographic Origin ◽  
Allelic Diversity ◽  
Genotypic Frequency ◽  
Single Strand Conformational Polymorphism ◽  
Melampsora Medusae ◽  
Natural Stands ◽  
Almost All ◽  
Poplar Leaf ◽  
Poplar Leaf Rust

Poplar leaf rust caused by Melampsora medusae f. sp. deltoidae is a widespread disease in North America, where epidemics occur within zones of sympatry and allopatry of telial hosts (Populus spp.) and aecial hosts (Larix spp.). To test the hypothesis that epidemics originate in the zone of sympatry where the rust can complete its life cycle, populations in sympatry and allopatry were analyzed with single-strand conformational polymorphism for codominant detection of alleles directly from uredinia. More alleles were detected in rust populations in the zone of host sympatry than in allopatry. Almost all alleles found in the zone of allopatry were a subset of the allelic diversity present in the zone of host sympatry. Distance analyses clustered populations according to geographic origin, but not sampling year or type of stand (plantation or natural stands). Large differences in allelic and genotypic frequency were observed between years in allopatry but not in sympatry, suggesting new colonizations in allopatric populations. Our results point to a dynamic and complex pattern of inoculum dissemination in polar leaf rust. The hypothesis most consistent with our results is that populations in sympatry represent a source of inoculum for epidemics, with some annual recolonization in allopatry, possibly via intermediate population jumps.

scholarly journals Association Analysis Identifies Melampsora ×columbiana Poplar Leaf Rust Resistance SNPs

PLoS ONE ◽  
2013 ◽  
Vol 8 (11) ◽  
pp. e78423 ◽  
Author(s):  
Jonathan La Mantia ◽  
Jaroslav Klápště ◽  
Yousry A. El-Kassaby ◽  
Shofiul Azam ◽  
Robert D. Guy ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Association Analysis ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Poplar Leaf ◽  
Poplar Leaf Rust

Prediction of poplar leaf rust epidemics from a leaf-disk assay

1994 ◽  
Vol 24 (10) ◽  
pp. 2085-2088 ◽  
Author(s):  
Richard C. Hamelin ◽  
Richard S. Ferriss ◽  
Louis Shain ◽  
Bart A. Thielges
Keyword(s):  
Leaf Rust ◽  
Field Tests ◽  
Leaf Disk ◽  
Relative Area ◽  
Progress Curve ◽  
Intermediate Resistance ◽  
Poplar Leaf ◽  
Parent Ratio ◽  
Poplar Leaf Rust ◽  
Leaf Disks

The reliability of a leaf-disk assay to assess resistance of Populusdeltoides Bartr. to Melampsoramedusae Thuëm. f.sp. deltoidae, the causal agent of poplar leaf rust, was evaluated. Leaf disks of eight host genotypes were inoculated in a spore settling tower with 11 isolates of the pathogen in all possible combinations, and the latent period, infection probability, sporulation, and progeny/parent ratio were recorded. Correlations were established between these measures and measures derived from field epidemics, namely the relative area under the disease progress curve, the apparent rate of infection, the final disease severity, and the number of days before defoliation. Four genotypes were highly resistant to all 11 isolates tested with the leaf-disk assay and to the local inoculum in field tests. Three genotypes were highly susceptible in inoculation assays and were also susceptible in the field. One genotype was highly resistant in inoculation assays but had intermediate resistance in the field. Significant correlations (p < 0.05) were found between all leaf-disk and all field parameters.

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