Topic
Funariaceae
About: Funariaceae is a research topic. Over the lifetime, 87 publications have been published within this topic receiving 1071 citations.
Papers published on a yearly basis
Papers
TL;DR: In this article, genealogical analyses of six loci from several populations of P. patens and related species in the genus Physcomitrium were performed, and the results unambiguously indicate that the so-called genus P. eurystomum arose at least three times from distinct ancestors within the genus, and that the ancestral population size of these lineages was much smaller than the current population sizes.
Abstract: 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.
65 citations
TL;DR: The culture media from gametophore over-producing mutants of the moss Physcomitrella patens have been examined for their cytokinin content and two cytokinins have been detected, one of which has been identified as N6-(Δ2-isopentenyl) adenine (2iP).
53 citations
TL;DR: It is argued that secondary reduction of sporophyte complexity in these species is due to the establishment of an ecological niche, namely spores resting in mud and possible spore dispersal by migratory birds.
Abstract: The moss Physcomitrella patens (Hedw.) Bruch & Schimp. is an important experimental model system for evolutionary-developmental studies. In order to shed light on the evolutionary history of Physcomitrella and related species within the Funariaceae, we analyzed the natural genetic diversity of the Physcomitrium-Physcomitrella species complex. Molecular analysis of the nuclear single copy gene BRK1 reveals that three Physcomitrium species feature larger genome sizes than Physcomitrella patens and encode two expressed BRK1 homeologs (polyploidization-derived paralogs), indicating that they may be allopolyploid hybrids. Phylogenetic analyses of BRK1 as well as microsatellite simple sequence repeat (SSR) data confirm a polyphyletic origin for three Physcomitrella lineages. Differences in the conservation of mitochondrial editing sites further support hybridization and cryptic speciation within the Physcomitrium-Physcomitrella species complex. We propose a revised classification of the previously described four subspecies of Physcomitrella patens into three distinct species, namely Physcomitrella patens, Physcomitrella readeri and Physcomitrella magdalenae. We argue that secondary reduction of sporophyte complexity in these species is due to the establishment of an ecological niche, namely spores resting in mud and possible spore dispersal by migratory birds. Besides the Physcomitrium-Physcomitrella species complex, the Funariaceae are host to their type species, Funaria hygrometrica, featuring a sporophyte morphology which is more complex. Their considerable developmental variation among closely related lineages and remarkable trait evolution render the Funariaceae an interesting group for evolutionary and genetic research.
53 citations
Journal Article•
51 citations
TL;DR: According to the data presented, the life cycle of F. hygrometrica may be completed in 4 months, P. pyriforme in 3 months and P. patens in 2 months, and temperature does seem to be the critical factor for the induction and maturation of gametangia.
Abstract: Three species of the Funariaceae (Physcomitrella patens (Hedw.) B.S.G., Physcomitrium pyriforme (Hedw.) Hampe and Funaria hygrometrica Hedw.) have been cultured under sterile conditions on Knop's inorganic me- dium (liquid and agar) to determine the conditions and minimum time nec- essary for completion of the sexual life cycle (spore to spore). According to the data presented, the life cycle of F. hygrometrica may be completed in 4 months, P. pyriforme in 3 months and P. patens in 2 months. In all three species the critical factor for the induction and maturation of gametangia is cold temperature. Delineation of the life cycle makes these organisms suitable for genetic study. Studies concerning the reproductive phase in bryophytes in culture have been relatively few. Voth and Hammer (1940) implicated photoperiod as the stimulus nec- essary for gametophore production in Marchantia. Morris (1961) stated that in five species of leafy liverworts the onset of sexual reproduction is controlled primarily by photoperiod. Benson-Evans (1964) reported that four species of Marchantiales and six of Jungermanniales are long-day plants, while Riccia glauca and Anthoceros laevis are short-day plants. She also cited some evidence that the photoperiodic effect is operative in many liverworts only within certain temperature limits. Ridgway (1967) reported that in species of Anthoceros, Phaeoceros and Notothylas, photoperiod is critical in initiation of antheridia while temperature has little effect. Contrary to the cases reported for the liverworts and hornworts, temperature does seem to be the
38 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 3 |
| 2020 | 5 |
| 2019 | 2 |
| 2018 | 3 |
| 2017 | 4 |
| 2016 | 2 |