Mating in mushrooms: increasing the chances but prolonging the affair

Brown, Andrew J.; Casselton, Lorna A.

doi:10.1016/s0168-9525(01)02343-5

Cited by 181 publications

(167 citation statements)

References 46 publications

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“…These findings indicate that the almond S locus has been subjected to repeated rearrangements, deletions, and insertions, like the S locus of Brassicaceae (Boyes et al, 1997;Casselman et al, 2000;Kusaba et al, 2001). The structural heteromorphism is a distinctive feature of loci consisting of coadapted gene complexes in different genetic systems (Ferris and Goodenough, 1994;Brown and Casselton, 2001). The heteromorphism of the S locus region is believed to maintain the tight association of the two S specificity genes, the S-RNase gene and the pollen S gene, in the RNase-based GSI and suggests that the pollen S gene is located within the S haplotypespecific region, which is defined by the markers NP79R and NP182F in almond.…”

Section: Discussionmentioning

confidence: 99%

“…The regions outside of the boundary markers were relatively conserved among different S haplotypes. The structural heteromorphism is the distinctive feature of loci consisting of coadapted gene complexes in different genetic systems, including sporophytic SI of Brassicaceae (Ferris and Goodenough, 1994;Brown and Casselton, 2001;Kusaba et al, 2001). The heteromorphism of the region containing the S specificity genes is believed to maintain the tight association of the pistil S gene and the pollen S gene, suggesting that the pollen S gene of almond is located in the S haplotype-specific region (Ushijima et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Structural and Transcriptional Analysis of the Self-Incompatibility Locus of Almond: Identification of a Pollen-Expressed F-Box Gene with Haplotype-Specific Polymorphism

et al. 2003

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Gametophytic self-incompatibility in Rosaceae, Solanaceae, and Scrophulariaceae is controlled by the S locus, which consists of an S-RNase gene and an unidentified "pollen S " gene. An ‫ف‬ 70-kb segment of the S locus of the rosaceous species almond, the S haplotype-specific region containing the S-RNase gene, was sequenced completely. This region was found to contain two pollen-expressed F-box genes that are likely candidates for pollen S genes. One of them, named SFB ( S haplotype-specific F-box protein), was expressed specifically in pollen and showed a high level of S haplotype-specific sequence polymorphism, comparable to that of the S-RNases. The other is unlikely to determine the S specificity of pollen because it showed little allelic sequence polymorphism and was expressed also in pistil. Three other S haplotypes were cloned, and the pollen-expressed genes were physically mapped. In all four cases, SFBs were linked physically to the S-RNase genes and were located at the S haplotype-specific region, where recombination is believed to be suppressed, suggesting that the two genes are inherited as a unit. These features are consistent with the hypothesis that SFB is the pollen S gene. This hypothesis predicts the involvement of the ubiquitin/26S proteasome proteolytic pathway in the RNase-based gametophytic self-incompatibility system.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural and Transcriptional Analysis of the Self-Incompatibility Locus of Almond: Identification of a Pollen-Expressed F-Box Gene with Haplotype-Specific Polymorphism

et al. 2003

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“…The B mating type genes encode pheromones and pheromone receptors, mediating signalling between cells and/or nuclei of different mating type. To form and maintain a dikaryotic mycelium, both A and B mating type genes of different specificity are needed (Casselton & Olesnicky 1998, Hiscock & Kües 1999, Brown & Casselton 2001, Casselton & Challen 2006, Casselton & Kües 2007. Cloned mating type genes were transformed into C. cinerea monokaryons.…”

Section: Genetic Access Of Fruiting Body Developmentmentioning

confidence: 99%

Wood production, wood technology, and biotechnological impacts

Kües¹

2007

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“…In the tetrapolar mating system, two independently inherited loci (MAT-A and MAT-B) control the mating type of a mycelium, a mechanism that may have evolved to reduce diploid selfing, because it reduces the compatibility during diploid selfing by one half. Compatible mating only occurs between homokaryotic mycelia (genetically haploid) that have different alleles at both the MAT-A and MAT-B mating-type loci (Brown and Casselton, 2001). Compatible homokaryons form a heterokaryotic mycelium by reciprocal nuclear exchange, resulting in a mycelium comprised of two nuclear genotypes that is genetically diploid.…”

Section: Introductionmentioning

confidence: 99%

Inbreeding depression in urban environments of the bird’s nest fungus Cyathus stercoreus (Nidulariaceae: Basidiomycota)

Malloure

James

2012

Heredity

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Many organisms display codispersal of offspring, but fewer display codispersal of compatible gametes. This mechanism enhances the ability of a species to colonize after long distance dispersal as a mechanism of reproductive assurance, but it also fosters inbreeding and potential reduction in fitness. Here we investigated both long distance dispersal and inbreeding in the bird's nest fungus Cyathus stercoreus, a dung and mulch-associated fungus with a splash cup fruiting body appearing like a miniature bird's nest of 'eggs' or peridioles that contain thousands of mating compatible meiotic spores. To investigate the genetic structure in the species, six North American urban populations were hierarchically sampled and genotyped using 10 microsatellite markers. We detected significant levels of inbreeding through heterozygote deficiencies at four loci, with global F IS ¼ 0.061. Dispersal limitation was suggested by both spatial autocorrelation and the detection of population structure between Louisiana and Michigan using clustering and F-statistics. Although inbreeding may facilitate colonization by the fungus, it has a negative effect on the fitness of populations as estimated from a 15% reduction in growth rates of inbred strains relative to outcrossed. Mating tests revealed that C. stercoreus has a higher estimated number of mating-type alleles (MAT-A ¼ 39, MAT-B ¼ 24) than other species of bird's nest fungi, which would increase its outcrossing efficiency. We speculate that the increased number of mating-type alleles is the result of a recent range and population size expansion into urban environments.

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Mating in mushrooms: increasing the chances but prolonging the affair

Cited by 181 publications

References 46 publications

Structural and Transcriptional Analysis of the Self-Incompatibility Locus of Almond: Identification of a Pollen-Expressed F-Box Gene with Haplotype-Specific Polymorphism

Structural and Transcriptional Analysis of the Self-Incompatibility Locus of Almond: Identification of a Pollen-Expressed F-Box Gene with Haplotype-Specific Polymorphism

Wood production, wood technology, and biotechnological impacts

Inbreeding depression in urban environments of the bird’s nest fungus Cyathus stercoreus (Nidulariaceae: Basidiomycota)

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