Mating systems in the genus Xanthoria (lichen-forming ascomycetes)

Honegger, Rosmarie; Zippler, Undine; Gansner, Heidi; Scherrer, Sandra

doi:10.1017/s0953756204009682

Cited by 44 publications

(57 citation statements)

References 8 publications

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“…The choice of a particular marker should be based on i) technical complexity of (Murtagh et al 1999;Printzen et al 1999;Dyer et al 2001;Honegger et al 2004a;Honegger et al 2004b;Seymour et al 2005a 16 † S, sexual; V, vegetative; V(S), predominantly vegetative dispersal; S/V, thalli either sexual or vegetative; -, no information available; ‡ mt, mitochondrial locus; mtr, locus belonging to the mitochondrial ribosomal DNA cluster; nr, locus located within the nuclear ribosomal DNA cluster; LSU, large subunit; SSU, small subunit; intron, intron polymorphism; flp, fragment length polymorphism; ITS, internal transcribed spacer; IGS, intergenic spacer; RPB2, RNA polymerase subunit 2; CHS1, chitin synthase 1; SSR, simple sequence repeat (microsatellite); COX1, cytochrome c oxidase, subunit 1; EFA, Elongation factor 1-; GPD, Glyceraldehyde 3-phosphate dehydrogenase; UID, an unidentified locus highly similar to glycine dehydrogenase; ¶ 0·019 ns if multiple alleles were included. § Overall measure across continents * P % 0·05; +, 0·05< P < 0·1; ns, not significant at P % 0·05 » CH, Switzerland; BC, British Columbia, Canada.…”

Section: Techniques For Recent Dna-based Population Genetic Studies Omentioning

confidence: 99%

“…From these pure sterile cultures, fungal DNA can be extracted which is suitable for universal fingerprinting techniques. Mycobiont isolates have recently been successfully used in combination with fingerprinting techniques to characterize lichen populations across their world distribution (Honegger et al 2004b) and to make inferences on mating systems (Dyer et al 2001;Honegger et al 2004a;Seymour et al 2005a, b). For lichenized fungi, Dyer et al (2001) reviewed the use of RAPD fingerprinting and Murtagh et al (1999) reported a RAPD protocol.…”

Section: Universal Fingerprinting Techniquesmentioning

confidence: 99%

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Population genetics of lichen-forming fungi – a review

Werth

2010

The Lichenologist

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Population genetics investigates the distribution of genetic variation in natural populations and the genetic differentiation among populations. Lichen-forming fungi are exciting subjects for population genetic studies due to their obligate symbiosis with a green-algal and/or cyanobacterial photobiont, and because their different reproductive strategies could influence fungal genetic structures in various ways. In this review, first, I briefly summarize the results from studies of chemotype variation in populations of lichen-forming fungi. Second, I compare and evaluate the DNA-based molecular tools available for population genetics of lichen-forming fungi. Third, I review the literature available on the genetic structure of lichen fungi to show general trends. I discuss some fascinating examples, and point out directions for future research.

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Section: Techniques For Recent Dna-based Population Genetic Studies Omentioning

confidence: 99%

Section: Universal Fingerprinting Techniquesmentioning

confidence: 99%

Population genetics of lichen-forming fungi – a review

Werth

2010

The Lichenologist

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“…Xanthoria elegans, another homothallic species, had MAT1-1-1 and MAT1-2-1 in all siblings (Scherrer et al 2005). Heterothallic species such as X. calcicola, X. polycarpa or X. capensis have either MAT1-1-1 or MAT1-2-1 in half of the siblings derived from one ascus and polymorphic fingerprints (2 × 4 genotypes among the 8 sporelings per ascus) resulting from successful recombination (Honegger et al 2004a;Scherrer et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Population genetics in the homothallic lichen-forming ascomyceteXanthoria parietina

Itten¹,

Honegger²

2010

The Lichenologist

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Abstract:The genetic diversity within and among populations of Xanthoria parietina was studied at the subspecific level with a fingerprinting technique (RAPD-PCR) applied to sterile cultured multispore isolates, each being derived from a single apothecium. Populations from coastal, rural and urban sites from NW, SW and central France and from NE Switzerland were investigated. Between 1 and 8 microsites of a few decimetres square, each comprising 13 to 27 thalli of X. parietina, were analysed per population. A total of 132 isolates from epiphytic and 3 isolates from epilithic specimens were investigated. Phenotypic variation was recorded among some of the thalli in the field and among sterile cultured isolates in the laboratory. A high diversity of genotypes was observed, even among thalli growing side by side in phenotypically homogenous populations. An average of 73·5 % polymorphism was found in all samples. As shown with Principal Coordinates Analysis (PCO), most of the genetic variation (90%) resided within, not among, populations. As X. parietina had previously been shown with molecular and fingerprinting techniques to be homothallic, the potential genetic background of this diversity is discussed. Intense genotype rather than gene (allele) flow seems to be an important element in X. parietina populations.

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“…The alternative approach involves direct analysis of sibling ascospore oVspring to determine the nature of breeding systems. The latter method seeks to determine whether a species is heterothallic or homothallic, but does not make any estimation of the degree of recombination or clonality within populations (e.g., Czembor and Arseniuk, 2000;Dyer et al, 1996;Honegger et al, 2004;Kema et al, 1996;Murtagh et al, 2000).…”

Section: Introductionmentioning

confidence: 99%