Evaluating the diversity of pteridophyte embryology in the light of recent phylogenetic analyses leads to new inferences on character evolution

Johnson, Gabriel; Renzaglia, Karen S.

doi:10.1007/s00606-009-0222-4

Cited by 22 publications

(25 citation statements)

References 77 publications

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“…2P', 4A). These results show that the early patterning Ceratopteris richardii embryo is similar to other leptosporangiate ferns (Johnson and Renzaglia, 2009). In Arabidopsis, root development begins by recruiting the most upper suspensor cell, the hypophysis, which would later give rise to the quiescent center and columella.…”

Section: How Early Is the First Root Specified During Ceratopteris Emsupporting

confidence: 56%

Development and cell cycle dynamics of the root apical meristem in the fernCeratopteris richardii

Aragón-Raygoza

Vasco

Blilou

et al. 2020

Preprint

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Ferns are a representative clade in plant evolution although underestimated in the genomic era. Ceratopteris richardii is an emergent model for developmental processes in ferns, yet a complete scheme of the different growth stages is necessary. Here, we present a developmental analysis, at the tissue and cellular levels, of the first shoot-borne root of Ceratopteris. We followed early stages and emergence of the root meristem in sporelings. While assessing root growth, the first shoot-borne root ceases its elongation between the emergence of the fifth and sixth roots, suggesting Ceratopteris roots follow a determinate developmental program. We report cell division frequencies in the stem cell niche after detecting labeled nuclei in the root apical cell (RAC) and derivatives after 8 hours of exposure. These results demonstrate the RAC has a continuous mitotic activity during root development. Detection of cell cycle activity in the RAC at early times suggests this cell acts as a non-quiescent organizing center. Overall, our results provide a framework to study root function and development in ferns and to better understand the evolutionary history of this organ.Summary StatementIn the Ceratopteris root, the apical cell and its derivatives have a high division frequency, suggesting the apical cell acts as a non-quiescent organizing center in the stem cell niche.

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Section: How Early Is the First Root Specified During Ceratopteris Emsupporting

confidence: 56%

Development and cell cycle dynamics of the root apical meristem in the fernCeratopteris richardii

Aragón-Raygoza

Vasco

Blilou

et al. 2020

Preprint

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“…Of the fungal sequences currently available in GenBank, the Glomus colonizing M. paleacea in our experiments were most similar to those sequenced from Psilotum nudum 13 , a tracheophyte with sporophytes that by convergent evolution show close morphological similarities to early vascular land plant fossils 3,4 but are of more recent origin; the Psilotaceae is the sister group to the Ophioglossales in the monilophytes, which includes horsetails and ferns 33 . The genera Lycopodium 10,34 , Botrychium 10,35 , Ophioglossum 36 and Psilotum 13,37 all include species with gametophytes that are achlorophyllous.…”

mentioning

confidence: 75%

Mutualistic mycorrhiza-like symbiosis in the most ancient group of land plants

et al. 2010

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over 35 years ago, it was hypothesized that mutualistic symbiotic soil fungi assisted land plants in their initial colonization of terrestrial environments. This important idea has become increasingly established with palaeobotanical and molecular investigations dating the interactions between arbuscular mycorrhizal fungi (AmF) and land plants to at least 400 ma, but the functioning of analogous partnerships in 'lower' land plants remains unknown. In this study, we show with multifactorial experiments that colonization of a complex thalloid liverwort, a member of the most ancient extant clade of land plants, with AmF significantly promotes photosynthetic carbon uptake, growth and asexual reproduction. Plant fitness increased through fungal-enhanced acquisition of phosphorus and nitrogen from soil, with each plant supporting 100-400 m of AmF mycelia. A simulated Co 2 -rich atmosphere, similar to that of the Palaeozoic when land plants originated, significantly amplified the net benefits of AmF and likely selection pressures for establishment of the symbiosis. our analyses provide essential missing functional evidence supporting AmF symbionts as drivers of plant terrestrialization in early Palaeozoic land ecosystems.

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“…[ Lycopodium selago L.] (Szypuła et al 2005 ). Since ferns and spermatophytes are sister lineages (Pryer et al 2001 ), ferns are useful subjects for developmental and morphological research, comparative evolution, and functional genomics (Johnson and Renzaglia 2008 , 2009 ; Der et al 2011 ; Tomescu 2011 ; Vasco et al 2013 ). They can also help to improve our understanding of SE.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, researchers aim for a better understanding of the evolution of land plants, and alternation of generations, as observed in ferns (Niklas and Kutschera 2009 ; Ligrone et al 2012 ). Johnson and Renzaglia ( 2008 , 2009 ) elucidated the development of the embryo and gametophyte placenta for the fern model Ceratopteris richardii Brongn. and significantly broadened our knowledge of the development of the fern zygotic embryo.…”

Section: Introductionmentioning

confidence: 99%

Somatic embryogenesis in ferns: a new experimental system

et al. 2015

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Key messageSomatic embryogenesis has never been reported in ferns. The study showed that it is much easier to evoke the acquisition and expression of embryogenic competence in ferns than in spermatophytes.AbstractWe discovered that the tree fern Cyathea delgadii offers an effective model for the reproducible and rapid formation of somatic embryos on hormone-free medium. Our study provides cyto-morphological evidence for the single cell origin and development of somatic embryos. Somatic embryogenesis (SE) in both primary and secondary explants was induced on half-strength micro- and macro-nutrients Murashige and Skoog medium without the application of exogenous plant growth regulators, in darkness. The early stage of SE was characterized by sequential perpendicular cell divisions of an individual epidermal cell of etiolated stipe explant. These resulted in the formation of a linear pro-embryo. Later their development resembled that of the zygotic embryo. We defined three morphogenetic stages of fern somatic embryo development: linear, early and late embryonic leaf stage. The transition from somatic embryo to juvenile sporophyte was quick and proceeded without interruption caused by dormancy. Following 9 weeks of culture the efficiency of somatic embryogenesis reached 12–13 embryos per responding explant. Spontaneous formation of somatic embryos and callus production, which improved the effectiveness of the process sevenfold in 10-month-long culture, occurred without subculturing. The tendency for C. delgadii to propagate by SE in vitro makes this species an excellent model for studies relating to asexual embryogenesis and the endogenous hormonal regulation of that process and opens new avenues of experimentation.

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Evaluating the diversity of pteridophyte embryology in the light of recent phylogenetic analyses leads to new inferences on character evolution

Cited by 22 publications

References 77 publications

Development and cell cycle dynamics of the root apical meristem in the fernCeratopteris richardii

Development and cell cycle dynamics of the root apical meristem in the fernCeratopteris richardii

Mutualistic mycorrhiza-like symbiosis in the most ancient group of land plants

Somatic embryogenesis in ferns: a new experimental system

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