Population structure of Rosellinia desmazieresii causing ring-dying of Salix repens

Population structure and genetic variation in Necrria fuckeliar~a Booth isolated from Picea abies (L.) Karst. in Sweden and Lithuania was studied using somatic incompatibility tests and DNA fingerprinting. All incompatibility pairings between different isolates of N. fuckeliana resulted in demarcation zones; thus, no vegetative compatibility groups were detected. Each isolate was distinguishable from all other isolates on the basis of banding patterns produced by amplification of DNA using the M I 3 primer. No country-specific markers were observed. Principal component analysis of amplified banding patterns separated the isolates from Sweden and Lithuania into two clusters, showing genetic differentiation between the geographical populations across the Baltic sea. An analysis of similarity matrix, calculated by the program SIMQUAL from the numerical taxonomy package NTSYS-pc, confirmed the separation of the isolates into the two groups. Low genetic differentiation was revealed within both the Swedish and Lithuanian geographical populations of the fungus. Local distances in the forest stand (100 m) had no influence on the genetic similarity of the N. ji~ckeliar~a isolates (R2 = 0.003).

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“…) Sacc. (Sharland et al 1988), and outcrossing in Hypoxylon spp. (Sharland and Rayner 1989) and Phomopsis spp.…”

Section: Introductionmentioning

confidence: 99%

Population structure and genetic variation in Nectria fuckeliana

Vasiliauskas¹,

Stenlid²

1997

Can. J. Bot.

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“…The pathogenicity and biology of R. desmazieresii are discussed in detail in Makambila et al. (1976), Makambila (1978), Barrett and Payne (1982), Sharland et al. (1988) and Ofong et al.…”

Section: Discussionmentioning

confidence: 99%

First Record of Rosellinia desmazieresii on Scots Pine and its Association with Disease in Poland

Kwaśna

Łakomy

2002

Journal of Phytopathology

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“…However, in contrast with the majority of plant mating system studies, most fungal mating system studies have been conducted in the laboratory, and have not considered the degree to which mating behavior in the laboratory may differ from mating behavior in natural populations. Of the few studies of fungal mating systems in natural populations, most have conformed more or less to laboratory results: self-compatible species predominately selfed and self-incompatible species predominately outcrossed (Ainsworth, 1987;Ennos and Swales, 1987;Sharland et al, 1988;Sharland and Rayner, 1989a,b;Adams et al, 1990;Kohn et al, 1991;Kohli and Kohn, 1992;Wang, 1997;Cortesi and Milgroom, 2001;Kroken, 2001), with several exceptions (see below). However, some fungal species deviate from the strict dichotomy between self-compatibility and self-incompatibility (Mathieson, 1952;Uhm and Fujii, 1983;Perkins, 1987;Herskowitz, 1988;Harrington and McNew, 1997), supporting the need for a broader perspective on fungal mating systems.…”

Section: Introductionmentioning

confidence: 89%

Mixed mating in natural populations of the chestnut blight fungus, Cryphonectria parasitica

et al. 2004

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As in plants, fungi exhibit wide variation in reproductive strategies and mating systems. Although most sexually reproducing fungi are either predominantly outcrossing or predominantly selfing, there are some notable exceptions. The haploid, ascomycete chestnut blight pathogen, Cryphonectria parasitica, has previously been shown to have a mixed mating system in one population in USA. In this report, we show that both selfing and outcrossing occur in 10 additional populations of C. parasitica sampled from Japan, Italy, Switzerland and USA. Progeny arrays from each population were assayed for segregation at vegetative incompatibility (vic) and DNA fingerprinting loci. Outcrossing rates (t m ) were estimated as the proportion of progeny arrays showing segregation at one or more loci, corrected by the probability of nondetection of outcrossing (a #). Estimates of t m varied from 0.74 to 0.97, with the lowest rates consistently detected in USA populations (0.74-0.78). Five populations (four in USA and one in Italy) had t m significantly less than 1, supporting the conclusion that these populations exhibit mixed mating. The underlying causes of variation in outcrossing rates among populations of C. parasitica are not known, but we speculate that -as in plants -outcrossing is a function of ecological, demographic and genetic factors.

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Population structure of Rosellinia desmazieresii causing ring-dying of Salix repens

Cited by 17 publications

References 2 publications

Population structure and genetic variation in Nectria fuckeliana

Population structure and genetic variation in Nectria fuckeliana

First Record of Rosellinia desmazieresii on Scots Pine and its Association with Disease in Poland

Mixed mating in natural populations of the chestnut blight fungus, Cryphonectria parasitica

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