Browsing by Subject "Plastids"
Now showing items 1-10 of 10
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Do asexual polyploid lineages lead short evolutionary lives? A case study from the fern genus Astrolepis.
(Evolution; international journal of organic evolution, 2011-11)A life-history transition to asexuality is typically viewed as leading to a heightened extinction risk, and a number of studies have evaluated this claim by examining the relative ages of asexual versus closely related sexual ... -
Evidence for reciprocal origins in Polypodium hesperium (Polypodiaceae): a fern model system for investigating how multiple origins shape allopolyploid genomes.
(American journal of botany, 2014-09-17)•Many polyploid species are composed of distinct lineages originating from multiple, independent polyploidization events. In the case of allopolyploids, reciprocal crosses between the same progenitor species can yield lineages ... -
Genes Translocated into the Plastid Inverted Repeat Show Decelerated Substitution Rates and Elevated GC Content.
(Genome biology and evolution, 2016-08-25)Plant chloroplast genomes (plastomes) are characterized by an inverted repeat (IR) region and two larger single copy (SC) regions. Patterns of molecular evolution in the IR and SC regions differ, most notably by a reduced ... -
Investigating deep phylogenetic relationships among cyanobacteria and plastids by small subunit rRNA sequence analysis.
(The Journal of eukaryotic microbiology, 1999-07)Small subunit rRNA sequence data were generated for 27 strains of cyanobacteria and incorporated into a phylogenetic analysis of 1,377 aligned sequence positions from a diverse sampling of 53 cyanobacteria and 10 photosynthetic ... -
Low-copy nuclear sequence data confirm complex patterns of farina evolution in notholaenid ferns (Pteridaceae).
(Molecular phylogenetics and evolution, 2019-09)Notholaenids are an unusual group of ferns that have adapted to, and diversified within, the deserts of Mexico and the southwestern United States. With approximately 40 species, this group is noted for being desiccation-tolerant ... -
NCP activates chloroplast transcription by controlling phytochrome-dependent dual nuclear and plastidial switches.
(Nature communications, 2019-06-14)Phytochromes initiate chloroplast biogenesis by activating genes encoding the photosynthetic apparatus, including photosynthesis-associated plastid-encoded genes (PhAPGs). PhAPGs are transcribed by a bacterial-type RNA polymerase ... -
Reconciling extreme branch length differences: decoupling time and rate through the evolutionary history of filmy ferns.
(Systematic biology, 2006-06)The rate of molecular evolution is not constant across the Tree of Life. Characterizing rate discrepancies and evaluating the relative roles of time and rate along branches through the past are both critical to ... -
Tree ferns: monophyletic groups and their relationships as revealed by four protein-coding plastid loci.
(Molecular phylogenetics and evolution, 2006-06)Tree ferns are a well-established clade within leptosporangiate ferns. Most of the 600 species (in seven families and 13 genera) are arborescent, but considerable morphological variability exists, spanning the giant scaly ... -
Unique expression of a sporophytic character on the gametophytes of notholaenid ferns (Pteridaceae).
(American journal of botany, 2012-06)PREMISE OF THE STUDY: Not all ferns grow in moist, shaded habitats; some lineages thrive in exposed, seasonally dry environments. Notholaenids are a clade of xeric-adapted ferns commonly characterized by the presence of ... -
Variation in frequency of plastid RNA editing within Adiantum implies rapid evolution in fern plastomes.
(American journal of botany, 2021-05-09)<h4>Premise</h4>Recent studies of plant RNA editing have demonstrated that the number of editing sites can vary widely among large taxonomic groups (orders, families). Yet, very little is known about intrageneric variation ...
