An intersterility group of Heterobasidion annosum specialized to Abies alba

Capretti, P.; Korhonen, K.; Mugnai, Laura; Romagnoli, Carlo

doi:10.1111/j.1439-0329.1990.tb01134.x

Cited by 123 publications

(104 citation statements)

References 8 publications

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“…The intersterility group of each isolate was determined with the aid of mating tests using two homokaryotic testers from each of the groups S, P and F (Capretti et al, 1990).…”

Section: Fungal Isolatesmentioning

confidence: 99%

“…The high susceptibility of silver fir to H. annosum was thought to be related to environmental and climatic conditions prevailing in Italian territories (Biraghi, 1962;Moriondo, 1970). Later studies, however, pointed more to the variability of the fungus (Moriondo et al, 1988), and subsequent mating experiments demonstrated that the fungus infecting silver fir formed an intersterility group (F group) of its own (Capretti et al, 1990). Subsequently, F group isolates were found in other parts of Europe including France, Switzerland, Austria, Slovenia, Poland, Hungary, Bulgaria and Greece Capretti et al, 1994;Munda, 1994;Pagony & Szántó, 1995;Lakomy, 1996;Tsopelas & Korhonen, 1996;Capretti & La Porta, unpublished data).…”

Section: Introductionmentioning

confidence: 99%

“…Its distribution area covers almost the entire Italian peninsula and overlaps with the distribution of the S group in the Alps and the P group in various parts of the country (Capretti et al, 1994). The F type is especially common in the Apennines where the most important host tree is silver fir (Abies alba); it is found in nearly all silver fir stands older than 50-60 years (Capretti & Moriondo, 1983;Capretti et al, 1990). However, only in particular situations where the inoculum mass is high does the F group attack other conifer species such as Norway spruce, sometimes young Douglas fir (Pseudotsuga menziesii), and more rarely, pine species (Capretti et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Geographical cline of DNA variation within the F intersterility group of Heterobasidion annosum in Italy

et al. 1997

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Eighty‐six Heterobasidion annosum isolates, mainly belonging to the F intersterility group and obtained from 32 different geographical localities in Italy, were subjected to genetic analysis by the Random Amplified Polymorphic DNA (RAPD) markers. The similarity between F and S groups was higher than that between F and P. In UPGMA Cluster Analysis, the F isolates originating from the same locality usually grouped in the same cluster. The isolates also showed a tendency to group at the level of larger geographical areas. Within the F group, isolates from the south of the Italian peninsula showed the highest genetic variation and northern isolates from the Alpine regions showed the lowest. This indicates a gradual cline along the peninsula. The genetic variability in the Italian F group is discussed in relation to the past and present distribution of the host species in Italy and Europe.

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“…The intersterility group of each isolate was determined with the aid of mating tests using two homokaryotic testers from each of the groups S, P and F (Capretti et al, 1990).…”

Section: Fungal Isolatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geographical cline of DNA variation within the F intersterility group of Heterobasidion annosum in Italy

et al. 1997

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“…Spruce (S), Pine (P) and Fir (F) (Korhonen, 1978;Capretti et al, 1990). A putatively non-outcrossing, non-pathogenic population referred to as Heterobasidion araucariae occurs in the southern hemisphere (Korhonen, 1978;Chase, Ullrich & Korhonen, 1985;Buchanan, 1988).…”

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confidence: 99%

Imbalanced nuclear ratios, post‐germination mortality and phenotype—genotype relationships in allopatrically‐derived heterokaryons of Heterobasidion annosum

Ramsdale

Rayner

1996

New Phytologist

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SUMMARYTwelve heterokaryotic strains of Heterobasidujn annosum (Fr.) Bref, containing nuclei and mitochondria derived from British and North European populations were prepared by pairing homokaryotic strains and isolating hyphal tips from either side of interaction interfaces. Conidia derived from the heterokaryons had high germinability and were predominantly uninucleate. The nuclear genotypes recovered frotn these conidia were predominantly nonresident in origin, reflecting the marked asymmetry in nuclear ratios (as high as 9:1) m favour of invasive nuclei that developed in the mycelium. In spite of this asymmetry, the heterokaryons had similar phenotypes to the resident homokaryons that they were derived from.Whereas the relative ability of sib-related nuclei to become established in a homokaryon was about equal in sympatric protoplasnn, it could he very different in allopatric protoplasm. Post-germination mortality due to the cessation of development following transfer of germlings to fresh medium was on average similar for allopatric and sympatric conidia, but there was a marked trend for reduction in mortality as nuclear ratio asymmetry increased. Homokaryons derived via conidia from a common heterokaryon exhibited less somatic incompatibility when paired together than did the original, basidiospore-derived strains.These findings indicate that phenotype-genotype relationships resulting from allopatric matings, such as could occur following geographical transposition, are liable to differ radically from those m sympatric matings and so have potentially profound effects on resident population structure.Key words: Episodic selection, genomic conflict, non-self recognition, nuclear-cytoplasmic relationships, speciation.There might also be important practical con-sequences ot allopatric matings. 1 he increased range The consequences of mating between allopatric of genomic relationships made possible by such populations are of considerable biological interest in matings might find biotechnological applications in that the)' reveal the potential for diverse and unstable the generation of new strains and products. Also the relationships to develop between disparate nuclear long distance transfer of fungi by man might have and mitochondrial genomes inhabiting the same significant repercussions on the genetic structure of protoplasm. In sympatric populations, inter-resident populations. relationships between genomes are subject to unGeographical transposition is one of the most remitting selection pressure. This pressure might important mechanisms likely to cause wh,at has been result in strong co-evolutionary feedbacks associated termed 'episodic selection ' (Brasier, 1987(Brasier, , 1995, Its with non-self recognition and the limitation of impact is likely to be particularly rapid and dramatic conflict, but it will not affect organisms that do not in fungi, as a consequence of the opportunistic life normally encounter one another in the field. styles and high rates of reproductive turnover , possible in natural po...

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“…Our focus was on isolates from silver fir, because there is already a good record of S ISG isolates from Norway spruce (Picea abies (L.) Karst.) in all of the alpine areas studied by us (Capretti et al 1990. Both stumps and sympto-matic or dead trees were sampled.…”

Section: Methodsmentioning

confidence: 99%

The European S and F intersterility groups ofHeterobasidion annosummay represent sympatric protospecies

Garbelotto¹,

Otrosina²,

Cobb³

et al. 1998

Can. J. Bot.

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Abstract:In those regions of Europe where they coexist, the F and S intersterility groups (ISGs) of Heterobasidion annosum (Fr.) Bref. are primarily found on Abies spp. and Picea abies (L.) Karst., respectively. Eighty-three isolates of H. annosum were collected from Abies alba Mill. from 19 sites in Italy, including 10 Abies-Picea mixed conifer stands in the eastern Alps. The ISGs of a subsample of 34 isolates were determined by ISG-diagnostic arbitrary-primed (AP) PCR primers. For a subsample of 16 isolates, including two S isolates from Norway and one S isolate from California, nuclear markers generated by AP-PCR analysis, and mitochondrial markers generated by restriction fragment length polymorphisms and sequencing of the ML5-ML6 region of the mitochondrial large ribosomal RNA gene indicated that, in Europe, (i) the F and S ISGs can be found in the same forest stand but they are two genetically distinct units with restricted gene flow between them; (ii) each of the two ISGs is monophyletic and may lack strong genetic substructuring in subpopulations; and (iii) the two ISGs are closely related to each other and their nearest common close relative is the allopatric S ISG from North America. By combining these results with paleobotanical information and results from previous studies, we postulate a recent sympatric divergence of these two groups driven by differential host specificity and mating barriers.Key words: species complex, protospecies, sympatric, mating barriers, host specificity. Résumé: Dans les régions d'Europe où ils co-existent, les groupes interstériles (ISGs) F et S de l'Heterobasidion annosum (Fr.) Bref. se retrouvent surtout sur les Abies spp. et le Picea abies (L.) Karst., respectivement. Les auteurs ont récolté 83 isolats du H. annosum à partir de l'Abies alba Mill., sur 19 sites en Italie, incluant 10 stations conifériennes mixtes Abies-Picea, dans l'est des Alpes. Une détermination sur un sous-échantillon de 34 isolats a été effectuée à l'aide du diagnostique ISG basé sur des amorces PCR, amorcées arbitrairement (AP). Dans un sous-échantillon de 16 isolats incluant deux isolats S provenant de Norvège et un isolat S obtenu en Californie, les marqueurs nucléaires générés par l'analyse AP-PCR, et les marqueurs mitochondriaux générés par les polymorphismes des longueurs de restriction, et le séquençage de la région ML5-ML6 du grand gène ARN mitochondrial ribosomien indiquent qu'en Europe (i) les ISGs F et S peuvent se retrouver dans le même peuplement forestier, mais se comportent comme deux unités génétiquement distinctes avec un flux génétique restreint entre les deux; (ii) chacun des deux ISGs est monophylétique et pourrait ne pas avoir de fortes sous-structures dans les sous-populations; et (iii) les deux ISGs sont étroitement reliés l'un à l'autre et leur parent commun le plus rapproché est le groupe S ISG de l'Amérique du Nord. En réunissant ces résultats aves les données paléobotaniques et les résultats d'études antécédentes, les auteurs proposent qu'il y a eu une divergence sympatriq...

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An intersterility group of Heterobasidion annosum specialized to Abies alba

Cited by 123 publications

References 8 publications

Geographical cline of DNA variation within the F intersterility group of Heterobasidion annosum in Italy

Geographical cline of DNA variation within the F intersterility group of Heterobasidion annosum in Italy

Imbalanced nuclear ratios, post‐germination mortality and phenotype—genotype relationships in allopatrically‐derived heterokaryons of Heterobasidion annosum

The European S and F intersterility groups ofHeterobasidion annosummay represent sympatric protospecies

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