Neurospora in Temperate Forests of Western North America

Jacobson, David J.; Powell, Amy Jo; Dettman, Jeremy R.; Saenz, G. S.; Barton, Magdalen M.; Hiltz, Megan D.; Dvorachek, William H.; Glass, N. Louise; Taylor, John W.; Natvig, Donald O.

doi:10.2307/3761989

Cited by 56 publications

(71 citation statements)

References 15 publications

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“…More recent collections in the temperate regions of North America and Europe following forest fi res, however, gave a different population structure: N. discreta, N. crassa and N. sitophila were more common than N. intermedia. Subsequent analyses of wild strains provided insights into the diversity and evolution of this model organism (Jacobson et al 2004(Jacobson et al , 2006. To this day, the wild isolates continue to serve as a valuable resource and studies with them have contributed to several major discoveries: vegetative incompatibility genes, transposable elements, senescence-causing mitochondrial plasmids, recessive sexual phase mutants and meiotic driveinducing spore killers, to name a few.…”

Section: Natural Populationsmentioning

confidence: 99%

“…There were several cytological studies involving the wild isolates and their derivatives (Raju 1979;Leslie and Raju 1985;Raju and Leslie 1992;Jacobson 1995;Raju and Burk 2004). described a new 8-spored heterothallic species, Neurospora discreta, based on crossing behaviour of certain wild isolates from the USA; this species is most prevalent among isolates from scorched trees, following forest fi res in western North America (Jacobson et al 2004). Neurospora population studies were often limited to observation and sampling of conidial masses on scorched vegetation.…”

Section: Natural Populationsmentioning

confidence: 99%

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Neurospora as a model fungus for studies in cytogenetics and sexual biology at Stanford

Raju

2009

J Biosci

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Dodge's early work (1927-1940) on Neurospora genetics and sexual biology inspired Beadle and Tatum at Stanford to use N.crassa for their landmark discovery that genes specify enzymes. Neurospora has since become a model organism for numerous genetic, cytogenetic, biochemical, molecular and population biology studies. Neurospora is haploid in the vegetative phase with a transient diploid sexual phase. Its meiotic cells (asci) are large, allowing easy examination of dividing nuclei and chromosomes under a light microscope. The haploid meiotic products are themselves the sexual progeny that grow into vegetative cultures, thus avoiding the cumbersome testcrosses and complex dominance -recessive relationships, as in diploid organisms.The Perkins'laboratory at Stanford (1949-2007) played a pivotal role in advancing our knowledge of Neurospora genetics, sexual biology, cytogenetics and population biology. Since 1974, I have taken advantage of various chromosome-staining methods to examine ascus and ascospore development in wild type and in numerous mutant strains. In addition,I have used GFP-tagged genes to visualize the expression or silencing of unpaired genes in a post-transcriptional gene silencing process (meiotic silencing by unpaired DNA) that operates specifically during meiosis. The genome of N. crassa contains over 10 000 protein- coding genes. Gene knockouts or mutations in specific sequences may now be readily correlated with the observed cytological defects in the sexual stage, thus advancing our molecular understanding of complex processes during ascus and ascospore development.

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Section: Natural Populationsmentioning

confidence: 99%

Section: Natural Populationsmentioning

confidence: 99%

Neurospora as a model fungus for studies in cytogenetics and sexual biology at Stanford

Raju

2009

J Biosci

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“…Neurospora crassa ascospores have been found in a layer of charred Molinia remains in the Holocene bog Engbertsdijksveen ( van Geel 1978), were associated with high charcoal levels at a late Holocene section from 'Het Ilperveld' in the Netherlands (Bakker and van Smeerdijk 1982) and were correlated with higher micro-charcoal frequencies in peat profiles from North York Moors, northeast England (Innes et al 2004). In the USA, the species is a primary coloniser of trees killed by wildfires including cottonwood stands in Rio Grande and mountain forests in New Mexico (Jacobson et al 2004). In association with elevated charcoal levels, Neurospora crassa ascospores clearly indicate fire in local proximity to the site and contemporaneous charcoal production, pollen rain and deposition of lake sediments.…”

Section: Mycota (Fungi)mentioning

confidence: 99%

“…The ascospores of the saprotrophic fungus Neurospora crassa germinate on rotting vegetable matter after charring (Dennis 1968). The sterile environment, rich in plant nutrients, together with heat and chemical by-products of the fire, favours ascospore generation (Jacobson et al 2004). Neurospora crassa ascospores have been found in a layer of charred Molinia remains in the Holocene bog Engbertsdijksveen ( van Geel 1978), were associated with high charcoal levels at a late Holocene section from 'Het Ilperveld' in the Netherlands (Bakker and van Smeerdijk 1982) and were correlated with higher micro-charcoal frequencies in peat profiles from North York Moors, northeast England (Innes et al 2004).…”

Section: Mycota (Fungi)mentioning

confidence: 99%

A review of the use of non-pollen palynomorphs in palaeoecology with examples from Australia

et al. 2011

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Records of the past climate and vegetation of Australia are frequently constructed using data generated from the analysis of pollen and pteridophyte spores alone, or in association with sedimentology. We demonstrate that the organic residue prepared for pollen analysis yields other organic-walled microfossils that can be used to provide additional and independent palaeoenvironmental information. These non-pollen palynomorphs (NPP) include microscopic remains of algae, cyanobacteria, fungi, insects, other invertebrates and cormophytes. Our study of the NPP from two Late Quaternary lake records from western Victoria, Australia, provided additional information on water quality, salinity, depth, temperature and nutrient levels to the general environmental interpretation derived from pollen data. From a review of the ecological preferences of taxa, and comparison of the NPP results with pollen and spore curves from the lake records, ecological indicator values were derived. The study confirms the utility of NPP in enhancing environmental reconstructions in Australia, and encourages their routine examination in palynological studies.

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“…Spores of fireadapted Neurospora do not germinate without heat or chemical conditioning associated with fire (Jacobson et al 2004). …”

Section: Introductionmentioning

confidence: 98%

A novel plant–fungal mutualism associated with fire

et al. 2012

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Neurospora in Temperate Forests of Western North America

Cited by 56 publications

References 15 publications

Neurospora as a model fungus for studies in cytogenetics and sexual biology at Stanford

Neurospora as a model fungus for studies in cytogenetics and sexual biology at Stanford

A review of the use of non-pollen palynomorphs in palaeoecology with examples from Australia

A novel plant–fungal mutualism associated with fire

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