Contributions to American Bryology. II.

Britton, Elizabeth G.

doi:10.2307/2475524

Cited by 5 publications

(3 citation statements)

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“…, 2006), both suggesting that outcrossing is quite rare. Nevertheless, the fact that we and others have reported natural or experimental hybrids between distantly related lineages of in the moss family Funariaceae (Britton, 1895; Andrews, 1918; von Wettstein, 1932; Bauer & Brosig, 1959; Pettet, 1964; McDaniel et al. , 2010) suggests that there are few F 1 barriers to hybridization in this group.…”

Section: Discussionmentioning

confidence: 69%

An experimental method to facilitate the identification of hybrid sporophytes in the moss Physcomitrella patens using fluorescent tagged lines

et al. 2011

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Summary The sequencing of the Physcomitrella patens genome, combined with the high frequency of gene targeting in this species, makes it ideal for reverse genetic studies. For forward genetic studies, experimental crosses and genetic analysis of progeny are essential.Since P. patens is monoicous, producing both male and female gametes on the same gametophore, and undergoing self-fertilization at a high frequency, the identification of crossed sporophytes is difficult. Usually spores from many sporophytes from a mixed culture must be testsed for the production of recombinant progeny.Here, we describe the use of transgenic lines that express a fluorescent transgene constitutively, to provide a direct visual screen for hybrid sporophytes.We show that segregations in crosses obtained with this technique are as expected, and demonstrate its utility for the study of the rate of outcrossing between three isolates of P. patens.

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Section: Discussionmentioning

confidence: 69%

An experimental method to facilitate the identification of hybrid sporophytes in the moss Physcomitrella patens using fluorescent tagged lines

et al. 2011

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“…The extreme differences in sporophyte morphology between Physcomitrella and Physcomitrium make hybrids between these genera easy to detect, and indeed the study of hybridization in the Funariaceae has a long history relative to that in other mosses (Natcheva and Cronberg 2004). Individuals with morphologically intermediate, presumably F1, sporophytes found on otherwise pure‐species gametophytes (i.e., maternal gametophytes bearing sporophytes produced with heterospecific sperm) have been reported between P. patens and P. sphaericum (Loeske 1929; Pettet 1964), P. patens and P. pyriforme (Andrews 1918, 1942; Loeske 1929; Pettet 1964; Tan 1978; Crum and Anderson 1981), and A. serratum and P. pyriforme (Britton 1895; Crum and Anderson 1981). However, we found no genealogical evidence of hybridization between species with extreme differences in sporophyte morphology.…”

Section: Discussionmentioning

confidence: 99%

“…Both genera are cosmopolitan in distribution, but Physcomitrium is more diverse than Physcomitrella, with a total of seven species found in Europe and temperate North America (Crum and Anderson 1981; Hill et al 2006). Populations containing species of both genera are frequent in some habitats, and hybrids are widely reported (Britton 1895; Andrews 1918; Loeske 1929; Andrews 1942; Pettet 1964; Tan 1978). Therefore, the evolutionary relationships within the Physcomitrella–Physcomitrium complex may not be captured by a single gene or organelle, because ongoing hybridization may cause different parts of the genome to have different histories.…”

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confidence: 99%

THE SPECIATION HISTORY OF THEPHYSCOMITRIUM-PHYSCOMITRELLASPECIES COMPLEX

et al. 2010

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A central problem in evolutionary biology is identifying factors that promote the evolution of reproductive isolation. Among mosses, biogeographic evidence indicates that the potential for migration is great, suggesting that biological factors other than geographic isolation may be critical for speciation in this group. The moss Physcomitrella patens (Funariaceae) has long been used as a model for interspecies hybridization and has recently emerged as an important model system for comparative genomics. We report genealogical analyses of six loci from several populations of P. patens and related species in the genus Physcomitrium. These results unambiguously indicate that the so-called genus Physcomitrella arose at least three times from distinct ancestors within the genus Physcomitrium. In spite of the evidence for natural hybridization in the Physcomitrella-Physcomitrium complex, genealogical and experimental hybridization data indicate that the taxonomically defined species are reproductively isolated. However, these analyses suggest that Physcomitrium eurystomum was formed from a hybridization event between two early diverging lineages in the complex, and that the ancestral population size of these lineages was much smaller than the current population sizes. We discuss these findings in the context of the inferred mating system in the Physcomitrella-Physcomitrium complex and patterns of speciation and diversification.K E Y W O R D S : Bryophyte, Funariaceae, genealogical conflict, hybrid speciation, reproductive isolation, self-fertile.

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The Moss Physcomitrium (Physcomitrella) patens: A Model Organism for Non-Seed Plants

et al. 2020

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Since the discovery two decades ago that transgenes are efficiently integrated into the genome of Physcomitrella patens by homologous recombination, this moss has been a premier model system to study evolutionary developmental biology (evo-devo) questions, stem cell reprogramming, and the biology of non-vascular plants. P. patens was the first non-seed plant to have its genome sequenced. With this level of genomic information together with increasing molecular genetic tools, a large number of reverse genetic studies have propelled the use of this model system. A number of technological advances have recently opened the door to forward genetics as well as extremely efficient and precise genome editing in P. patens. Additionally, careful phylogenetic studies with increased resolution have suggested that P. patens emerged from within Physcomitrium. Thus, rather than Physcomitrella patens, the species should be named Physcomitrium patens. Here we review these advances and describe the areas where P. patens has had the most impact on plant biology. Introduction: Development of P. patens as a model species 1! Physcomitrella patens 'Gransden' was established as a model species based on 2! cultures derived from a single spore of a sample collected by H.L.K. Whitehouse from a site 3! in Gransden Wood (Huntingdonshire, UK) in 1962. From the 1960s to the 1980s, this moss 4! was primarily used as a genetic system to isolate and study mutants in a variety of processes 5! including plant morphology, hormone biology, nutrition, and responses to gravity (Engel,

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Contributions to American Bryology. II.

Cited by 5 publications

References 0 publications

An experimental method to facilitate the identification of hybrid sporophytes in the moss Physcomitrella patens using fluorescent tagged lines

An experimental method to facilitate the identification of hybrid sporophytes in the moss Physcomitrella patens using fluorescent tagged lines

THE SPECIATION HISTORY OF THEPHYSCOMITRIUM-PHYSCOMITRELLASPECIES COMPLEX

The Moss Physcomitrium (Physcomitrella) patens: A Model Organism for Non-Seed Plants

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