Neurospora from natural populations: Toward the population biology of a haploid eukaryote

Perkins, David; Turner, Barbara C.

doi:10.1016/0147-5975(88)90001-1

Cited by 161 publications

(137 citation statements)

References 142 publications

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“…Instead of morphology, Perkins and colleagues, in this and subsequent publications (Perkins & Turner 1988;Turner et al 2001), advocated the use of mating tests to pairs of tester strains (one for each of the two mating types, designated mat A and mat a) to assign individuals to species. This criterion was used to describe a new outbreeding species, Neurospora discreta (Perkins & Raju 1986).…”

Section: The Fungi a Kingdom Of Microbial Eukaryotesmentioning

confidence: 99%

“…Remember that by MSR, the eight-spored Neurospora species would form a single species with a circumglobal tropical and subtropical distribution. Using BSR based on mating to tester strains, Perkins and colleagues recognized four, eight-spored species with the following distributions (Perkins & Turner 1988;Turner et al 2001). Neurospora intermedia had the broadest, being found in tropical and subtropical regions of Asia, the New World, Africa, India and Australia.…”

Section: The Fungi a Kingdom Of Microbial Eukaryotesmentioning

confidence: 99%

“…Neurospora species have not been shown to prefer particular plant species (Perkins et al 1976;Perkins & Turner 1988;Turner et al 2001;Jacobson et al 2004) and they are considered to be free-living heterotrophs. The early publications on these fungi describe four species, three with eight spores per ascus and one with just four (Shear & Dodge 1927;Tai 1935).…”

Section: The Fungi a Kingdom Of Microbial Eukaryotesmentioning

confidence: 99%

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Eukaryotic microbes, species recognition and the geographic limits of species: examples from the kingdom Fungi

Taylor

Turner

Townsend

et al. 2006

Phil. Trans. R. Soc. B

304

249

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The claim that eukaryotic micro-organisms have global geographic ranges, constituting a significant departure from the situation with macro-organisms, has been supported by studies of morphological species from protistan kingdoms. Here, we examine this claim by reviewing examples from another kingdom of eukaryotic microbes, the Fungi. We show that inferred geographic range of a fungal species depends upon the method of species recognition. While some fungal species defined by morphology show global geographic ranges, when fungal species are defined by phylogenetic species recognition they are typically shown to harbour several to many endemic species. We advance two non-exclusive reasons to explain the perceived difference between the size of geographic ranges of microscopic and macroscopic eukaryotic species when morphological methods of species recognition are used. These reasons are that microbial organisms generally have fewer morphological characters, and that the rate of morphological change will be slower for organisms with less elaborate development and fewer cells. Both of these reasons result in fewer discriminatory morphological differences between recently diverged lineages. The rate of genetic change, moreover, is similar for both large and small organisms, which helps to explain why phylogenetic species of large and small organisms show a more similar distribution of geographic ranges. As a consequence of the different rates in fungi of genetic and morphological changes, genetic isolation precedes a recognizable morphological change. The final step in speciation, reproductive isolation, also follows genetic isolation and may precede morphological change.

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Section: The Fungi a Kingdom Of Microbial Eukaryotesmentioning

confidence: 99%

Section: The Fungi a Kingdom Of Microbial Eukaryotesmentioning

confidence: 99%

Section: The Fungi a Kingdom Of Microbial Eukaryotesmentioning

confidence: 99%

See 1 more Smart Citation

Eukaryotic microbes, species recognition and the geographic limits of species: examples from the kingdom Fungi

Taylor

Turner

Townsend

et al. 2006

Phil. Trans. R. Soc. B

304

249

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“…Whereas in angiosperms germination of non-dormant seeds is cued by appropriate conditions and dormant seeds germinate only following hostile cold or dry seasons, germination of ascospores of N. crassa is normally cued by intense heat to colonize decaying plant material following fire [24], but dormant ascospores require a second heat exposure to germinate. Heat both initiates ascospore germination and kills all life stages except ascospores that have remained dormant.…”

Section: Introductionmentioning

confidence: 99%

Experimental evolution of bet hedging under manipulated environmental uncertainty in Neurospora crassa

2014

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All organisms are faced with environmental uncertainty. Bet-hedging theory expects unpredictable selection to result in the evolution of traits that maximize the geometric-mean fitness even though such traits appear to be detrimental over the shorter term. Despite the centrality of fitness measures to evolutionary analysis, no direct test of the geometric-mean fitness principle exists. Here, we directly distinguish between predictions of competing fitness maximization principles by testing Cohen's 1966 classic bet-hedging model using the fungus Neurospora crassa. The simple prediction is that propagule dormancy will evolve in proportion to the frequency of 'bad' years, whereas the prediction of the alternative arithmetic-mean principle is the evolution of zero dormancy as long as the expectation of a bad year is less than 0.5. Ascospore dormancy fraction in N. crassa was allowed to evolve under five experimental selection regimes that differed in the frequency of unpredictable 'bad years'. Results were consistent with bet-hedging theory: final dormancy fraction in 12 genetic lineages across 88 independently evolving samples was proportional to the frequency of bad years, and evolved both upwards and downwards as predicted from a range of starting dormancy fractions. These findings suggest that selection results in adaptation to variable rather than to expected environments.

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“…They show relatively simple life cycles (see below). Some population genetic (Perkins & Turner, 1988) and molecular data are also available and provide useful information. The model will probably also be valid for many other ascomycete species, but these are not treated explicitly here.…”

Section: Introductionmentioning

confidence: 99%

Evolution of reproductive systems in filamentous ascomycetes. I. Evolution of mating types

Nauta

Hoekstra

1992

Heredity

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In the ascomycete family of Sordariaceae both heterothallism (with two mating types) and homothallism (without mating types) are common. A population genetic model is made in an attempt to find out under which conditions evolution from one system to the other is conceivable. Analysis shows that evolution from hetero-to homothallism is possible but evolution from homo-to heterothallism is improbable. As in these haploid fungi self-fertilization has other consequences than in diploid organisms, homothallism seems to have little disadvantage. It is found that polymorphism in homo-and heterothallism can be stable, although this has not yet been found in Sordariaceae in nature.

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Neurospora from natural populations: Toward the population biology of a haploid eukaryote

Cited by 161 publications

References 142 publications

Eukaryotic microbes, species recognition and the geographic limits of species: examples from the kingdom Fungi

Eukaryotic microbes, species recognition and the geographic limits of species: examples from the kingdom Fungi

Experimental evolution of bet hedging under manipulated environmental uncertainty in Neurospora crassa

Evolution of reproductive systems in filamentous ascomycetes. I. Evolution of mating types

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