Adaptation of poplar leaf rust to Eastern cottonwood

Hamelin, Richard; Shain, Louis; Thielges, B. A.

doi:10.1007/bf00036090

Cited by 11 publications

(2 citation statements)

References 21 publications

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“…There is a growing body of experimental and theoretical evidence that pathogens can adapt to QR, thus leading to resistance erosion (James & Fry, 1983; Kolmer & Leonard, 1986; Geiger & Heun, 1989; Newton & McGurk, 1991; Hamelin et al. , 1992; Newton, 1992; Ahmed et al.…”

Section: Discussionmentioning

confidence: 99%

Potential of Eurasian poplar rust to overcome a major quantitative resistance factor

Dowkiw¹,

Voisin²,

Bastien³

2010

Plant Pathology

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The effect of R US , a major quantitative resistance (QR) factor inherited from Populus trichocarpa, was assessed in two Populus deltoides · P. trichocarpa F 1 progenies against eight isolates of Melampsora larici-populina, the causal agent of Eurasian poplar rust. Six isolates were identified on which R US had no significant effect. The first R US -defeating isolate identified suggested a pre-existing potential to overcome R US in the pathogen's populations. The P. deltoides genetic background made no difference either to the ability of a given isolate to overcome R US or to the relative and absolute aggressiveness of the isolates. This study illustrates how extreme the isolate-specificity of QR can be. It also yields insights into the relationship between size of uredinia and sporulation rate, discussing the epidemiological significance of spore production per mm 2 uredinium.

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Section: Discussionmentioning

confidence: 99%

Potential of Eurasian poplar rust to overcome a major quantitative resistance factor

Dowkiw¹,

Voisin²,

Bastien³

2010

Plant Pathology

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“…In western Kentucky, isolates of M. medusae f. sp. deltoides from the southeastern United States had broader adaptation and were more virulent on local southern host genotypes of P. deltoides than were isolates from the northern United States (Hamelin et al 1992).…”

Section: Introductionmentioning

confidence: 94%

Genetic diversity of poplar leaf rust populations in the north-central United States

Harrington¹

2006

Can. J. For. Res.

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Uredinia of poplar leaf rust, Melampsora medusae Thüm f.sp. deltoides, appeared in late July 1998, June 1999, and August 2000 in a cottonwood (Populus deltoides Bartr.) stand in Ames, Iowa. Seedlings of the alternate host (eastern larch, Larix laricina (Du Roi) K. Koch) set out at the site in spring 2000 formed aecia 3 months before uredinia appeared. Using three PCR-based microsatellite markers, the aecial population was genetically diverse and in Hardy–Weinberg equilibrium, typical of a population that had gone through sexual reproduction. Uredinia populations in 1998–2000 had lower levels of gene diversities (from 0.58 to 0.71) and were not in Hardy–Weinberg equilibrium. Of nine populations in Minnesota, Iowa, and Missouri during the early stage of the 1999 epidemic, the two populations with the highest gene diversity, the highest level of heterozygosity, and the greatest number of unique genotypes were within the natural geographic range of larch. However, the southernmost population in Missouri was also in Hardy–Weinberg equilibrium. Epidemics started sooner in Iowa than in Minnesota, which contradicts the hypothesis that epidemics begin in northern regions where the alternate hosts naturally overlap. Epidemics appeared to commence independently in the various locations, perhaps focused around areas where ornamental larch is in proximity to P. deltoides.

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Evidence for resistance of mountain birch (Betula pubescens ssp. czerepanovii) to birch rust (Melampsoridium betulinum)

Helander

Vuorinen

Saikkonen

et al. 1998

Mycological Research

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Adaptation of poplar leaf rust to Eastern cottonwood

Cited by 11 publications

References 21 publications

Potential of Eurasian poplar rust to overcome a major quantitative resistance factor

Potential of Eurasian poplar rust to overcome a major quantitative resistance factor

Genetic diversity of poplar leaf rust populations in the north-central United States

Evidence for resistance of mountain birch (Betula pubescens ssp. czerepanovii) to birch rust (Melampsoridium betulinum)

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