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Articles 1 - 30 of 49
Full-Text Articles in Plant Sciences
Phylogeny, Adaptive Radiation, And Historical Biogeography Of Bromeliaceae Inferred From Ndhf Sequence Data, Thomas J. Givnish, Kendra C. Millam, Paul E. Berry, Kenneth J. Sytsma
Phylogeny, Adaptive Radiation, And Historical Biogeography Of Bromeliaceae Inferred From Ndhf Sequence Data, Thomas J. Givnish, Kendra C. Millam, Paul E. Berry, Kenneth J. Sytsma
Aliso: A Journal of Systematic and Floristic Botany
Cladistic analysis of ndhF sequences identifies eight major bromeliad clades arranged in ladderlike fashion. The traditional subfamilies Tillandsioideae and Bromelioideae are monophyletic, but Pitcairnioideae are paraphyletic, requiring the description of four new subfamilies, recircumscription of Pitcairnioideae and Navioideae, the sinking of Ayensua, and description of the new genus Sequencia. Brocchinioideae are basalmost, followed by Lindmanioideae, both restricted to the Guayana Shield. Next is an unresolved trichotomy involving Hechtioideae from Central America, Tillandsioideae, and the remaining bromeliads in subfamilies Navioideae, Pitcairnioideae, Puyoideae, and Bromelioideae. Bromeliads arose as C3 terrestrial plants on moist infertile sites in …
Systematics Of Bromelioideae (Bromeliaceae)—Evidence From Molecular And Anatomical Studies, Ralf Horres, Katharina Schulte, Kurt Weising, Georg Zizka
Systematics Of Bromelioideae (Bromeliaceae)—Evidence From Molecular And Anatomical Studies, Ralf Horres, Katharina Schulte, Kurt Weising, Georg Zizka
Aliso: A Journal of Systematic and Floristic Botany
A reconstruction of the phylogeny of Bromeliaceae based on sequence data from three noncoding chloroplast DNA markers (trnL intron, trnT–trnL, and trnT–trnF intergenic spacer [IGS]) is presented, including 26 genera and 33 species. Relationships of Bromelioideae and phylogeny within this subfamily were analyzed in more detail on the basis of two of these markers (trnL intron and trnL–trnF IGS) using a set of 37 genera/74 species of Bromeliaceae, including 28 genera/60 species of Bromelioideae. Sister group relationships of Bromelioideae were not resolved with sufficient reliability, but the …
The Juncaceae-Cyperaceae Interface: A Combined Plastid Sequence Analysis, Eleanor Jones, David A. Simpson, Trevor R. Hodkinson, Mark W. Chase, John A. N. Parnell
The Juncaceae-Cyperaceae Interface: A Combined Plastid Sequence Analysis, Eleanor Jones, David A. Simpson, Trevor R. Hodkinson, Mark W. Chase, John A. N. Parnell
Aliso: A Journal of Systematic and Floristic Botany
Phylogenetic relationships of Juncaceae and related families of Cyperales were investigated using DNA sequence data from the plastid rps16 intron, trnL intron, and trnL–F intergenic spacer. Results using parsimony analysis of the aligned matrices find Juncaceae and Cyperaceae to be monophyletic families, which form a clade sister to a monophyletic Thurniaceae that includes Prionium (Prioniaceae), all three clades with 100% bootstrap support. Within Juncaceae, the genus Luzula is monophyletic with 100% bootstrap support and sister to the rest of Juncaceae. Further groupings within the family indicate that the genus Juncus may be monophyletic only with the inclusion …
Chromosome Evolution In Cyperales, Eric H. Roalson, Andrew G. Mccubbin, Richard Whitkus
Chromosome Evolution In Cyperales, Eric H. Roalson, Andrew G. Mccubbin, Richard Whitkus
Aliso: A Journal of Systematic and Floristic Botany
Karyotypic evolution is a prominent feature in the diversification of many plants and animals, yet the role that chromosomal changes play in the process of diversification is still debated. At the diploid level, chromosome fission and/or fusion are necessary components of chromosomal structural change associated with diversification. Yet the genomic features required for these events remain unknown. Here we present an overview of what is known about genomic structure in Cyperales, with particular focus on the current level of understanding of chromosome number and genome size and their impact in a phylogenetic context. We outline ongoing projects exploring genomic structure …
Phylogeny Of Cyperaceae Based On Dna Sequence Data–A New Rbcl Analysis, David A. Simpson, A. Muthama Muasya, Marccus V. Alves, Jeremy J. Bruhl, Sandra Dhooge, Mark W. Chase, Carol A. Furness, Kioumars Ghamkhar, Paul Goetghebeur, Trevor R. Hodkinson, Adam D. Marchant, Anton A. Reznicek, Roland Nieuwborg, Eric H. Roalson, Erik Smets, Julian R. Starr, William W. Thomas, Karen L. Wilson, Xiufu Zhang
Phylogeny Of Cyperaceae Based On Dna Sequence Data–A New Rbcl Analysis, David A. Simpson, A. Muthama Muasya, Marccus V. Alves, Jeremy J. Bruhl, Sandra Dhooge, Mark W. Chase, Carol A. Furness, Kioumars Ghamkhar, Paul Goetghebeur, Trevor R. Hodkinson, Adam D. Marchant, Anton A. Reznicek, Roland Nieuwborg, Eric H. Roalson, Erik Smets, Julian R. Starr, William W. Thomas, Karen L. Wilson, Xiufu Zhang
Aliso: A Journal of Systematic and Floristic Botany
Since the Monocots II meeting in 1998, significant new data have been published that enhance our systematic knowledge of Cyperaceae. Phylogenetic studies in the family have also progressed steadily. For this study, a parsimony analysis was carried out using all rbcL sequences currently available for Cyperaceae, including data for two new genera. One of the four subfamilies (Caricoideae) and seven of the 14 tribes (Bisboeckelereae, Cariceae, Cryptangieae, Dulichieae, Eleocharideae, Sclerieae, Trilepideae) are monophyletic. Subfamily Mapanioideae and tribe Chrysitricheae are monophyletic if, as the evidence suggests, Hellmuthia is considered a member of Cypereae. Some other features of our analysis include: …
Phylogenetic Implications Of A Unique 5.8s Nrdna Insertion In Cyperaceae, Julian R. Starr, Geneviève Gravel, Anne Bruneau, A. Muthama Muasya
Phylogenetic Implications Of A Unique 5.8s Nrdna Insertion In Cyperaceae, Julian R. Starr, Geneviève Gravel, Anne Bruneau, A. Muthama Muasya
Aliso: A Journal of Systematic and Floristic Botany
The purpose of this study was to assess the phylogenetic utility of a large insertion (3 bp) in the 5.8S gene of nuclear ribosomal DNA (nrDNA) in Cyperaceae and selected Juncaceae. This was done by reconstructing the character evolution of the insertion on a phylogeny derived from rbcL sequences. Results suggest that the insertion was gained once at the base of Cyperaceae followed by multiple losses in its most-derived taxa. Despite several homoplastic losses (CI = 0.20), the pattern of insertion loss (RI = 0.88), and base pair variation within the insertion were useful for defining sedge clades at …
Phylogeny Of Abildgaardieae (Cyperaceae) Inferred From Its And Trnl–F Data, Kioumars Ghamkhar, Adam D. Marchant, Karen L. Wilson, Jeremy J. Bruhl
Phylogeny Of Abildgaardieae (Cyperaceae) Inferred From Its And Trnl–F Data, Kioumars Ghamkhar, Adam D. Marchant, Karen L. Wilson, Jeremy J. Bruhl
Aliso: A Journal of Systematic and Floristic Botany
Within the tribe Abildgaardieae, the relationships between Fimbristylis and its relatives have not been certain, and the limits of Fimbristylis have been unclear, with Bulbostylis and Abildgaardia variously combined with it and each other. The relationships and limits of tribes Abildgaardieae and Arthrostylideae and their genera were evaluated across 49 representative species using parsimony and maximum likelihood analyses of ITS (nuclear ribosomal) and trnL–F (plastid) DNA sequence data separately and combined. The evolutionary reconstructions derived from sequences of cpDNA and nrDNA disagree about the position of tribe Arthrostylideae relative to Abildgaardieae; Arthrostylis and Actinoschoenus are either nested within Abildgaardieae …
Phylogenetic Relationships In Tribe Cariceae (Cyperaceae) Based On Nested Analyses Of Four Molecular Data Sets, Marcia J. Waterway, Julian R. Starr
Phylogenetic Relationships In Tribe Cariceae (Cyperaceae) Based On Nested Analyses Of Four Molecular Data Sets, Marcia J. Waterway, Julian R. Starr
Aliso: A Journal of Systematic and Floristic Botany
Phylogenetic reconstruction for Carex and relatives in tribe Cariceae is complicated by species richness and nearly cosmopolitan distribution. In this investigation, our main objective was to estimate evolutionary relationships in tribe Cariceae using DNA sequence data from two spacer regions in nuclear ribosomal genes (ITS and ETS-1f) combined with noncoding chloroplast DNA (trnL intron, trnL–trnF intergenic spacer, and trnE–trnD intergenic spacers). Parsimony analyses of separate and combined data and Bayesian analysis of the combined data matrix revealed strong support for monophyly of tribe Cariceae and for monophyly of two major lineages, one …
Chromosome Number Changes Associated With Speciation In Sedges: A Phylogenetic Study In Carex Section Ovales (Cyperaceae) Using Aflp Data, Andrew L. Hipp, Paul E. Rothrock, Anton A. Reznicek, Paul E. Berry
Chromosome Number Changes Associated With Speciation In Sedges: A Phylogenetic Study In Carex Section Ovales (Cyperaceae) Using Aflp Data, Andrew L. Hipp, Paul E. Rothrock, Anton A. Reznicek, Paul E. Berry
Aliso: A Journal of Systematic and Floristic Botany
Phylogenetic analysis of amplified fragment length polymorphisms (AFLP) was used to infer patterns of morphologic and chromosomal evolution in an eastern North American group of sedges (ENA clade I of Carex sect. Ovales). Distance analyses of AFLP data recover a tree that is topologically congruent with previous phylogenetic estimates based on nuclear ribosomal DNA (nrDNA) sequences and provide support for four species groups within ENA clade I. A maximum likelihood method designed for analysis of restriction site data is used to evaluate the strength of support for alternative topologies. While there is little support for the precise placement of …
Towards A Comprehensive Survey Of C3 And C4 Photosynthetic Pathways In Cyperaceae, Jeremy J. Bruhl, Karen L. Wilson
Towards A Comprehensive Survey Of C3 And C4 Photosynthetic Pathways In Cyperaceae, Jeremy J. Bruhl, Karen L. Wilson
Aliso: A Journal of Systematic and Floristic Botany
Members of the family Cyperaceae were surveyed by original observation and from the literature to assess the distribution of C3 and C4 photosynthetic pathways in the family. All 107 genera were included in the current sample, with 91 genera assessed as consistently C3 and 11 genera as C4. The genera Abildgaardia, Cyperus, Eleocharis, Fimbristylis, and Rhynchospora are variable for this trait. Of the total number (1474) of specific (1406) and infraspecific (68) taxa sampled, 938 taxa (63%) are C3, 527 taxa (36%) are C4, and nine species …
The Schoenus Spikelet: A Rhipidium? A Floral Ontogenetic Answer, Alexander Vrijdaghs, Paul Goetghebeur, Erik Smets, Pieter Caris
The Schoenus Spikelet: A Rhipidium? A Floral Ontogenetic Answer, Alexander Vrijdaghs, Paul Goetghebeur, Erik Smets, Pieter Caris
Aliso: A Journal of Systematic and Floristic Botany
The inflorescence unit of Schoenus nigricans and S. ferrugineus consists of a zigzag axis and distichously arranged bracts, each of which may or may not subtend a bisexual flower. Each flower seems to terminate a lateral axis. These features have led to a controversy about the nature of the inflorescence unit, particularly whether it is monopodial or sympodial. It was often seen as a pseudospikelet composed of a succession of lateral axes, each subtended by the prophyll of the previous axis, as in a rhipidium. Many authors, however, consider the inflorescence units of all Cyperaceae to be indeterminate, racemose, actual …
Phylogeny And Historical Ecology Of Rhodocoma (Restionaceae) From The Cape Floristic Region, Christopher R. Hardy, H. Peter Linder
Phylogeny And Historical Ecology Of Rhodocoma (Restionaceae) From The Cape Floristic Region, Christopher R. Hardy, H. Peter Linder
Aliso: A Journal of Systematic and Floristic Botany
A macroevolutionary analysis of macroecological relationships in Rhodocoma revealed a complex history of rapid ecological divergence, as well as genetic isolation via shifts in flowering times. The rate and extent of divergence observed among even the youngest of species pairs indicated that the selective forces driving these processes are strong enough to effect substantial amounts of ecological change in relatively short periods of time, and are potentially important factors promoting the origin and persistence of species diversity not only in Rhodocoma, but also the African Restionaceae as a whole. These results also suggest that the rate and extent of …
Phylogeny Of The Grasses (Poaceae) Revisited, Melvin R. Duvall, Jerrold I Davis, Lynn G. Clark, Jeffrey D. Noll, Douglas H. Goldman, J. Gabriel Sánchez-Ken
Phylogeny Of The Grasses (Poaceae) Revisited, Melvin R. Duvall, Jerrold I Davis, Lynn G. Clark, Jeffrey D. Noll, Douglas H. Goldman, J. Gabriel Sánchez-Ken
Aliso: A Journal of Systematic and Floristic Botany
The most robust previously published phylogeny for the overall structure of the grass family (Poaceae) shows three early diverging lineages and two major derived clades, the BEP clade and the PACCAD clade (Grass Phylogeny Working Group 2001). A few key taxa were incompletely sampled, however, and support for the BEP clade was moderate at best and relationships among the major lineages within the PACCAD clade remained unresolved. In addition, recent studies indicated that the sister group to Poaceae may be Joinvilleaceae and/or Ecdeiocoleaceae, the latter of which were not previously sampled. In this study, missing structural data were determined and …
Large Trees, Supertrees, And Diversification Of The Grass Family, Trevor R. Hodkinson, Nicolas Salamin, Mark W. Chase, Yanis Bouchenak-Khelladi, Stephen A. Renvoize, Vincent Savolainen
Large Trees, Supertrees, And Diversification Of The Grass Family, Trevor R. Hodkinson, Nicolas Salamin, Mark W. Chase, Yanis Bouchenak-Khelladi, Stephen A. Renvoize, Vincent Savolainen
Aliso: A Journal of Systematic and Floristic Botany
Phylogenetic studies of grasses (Poaceae) are advanced in comparison with most other angiosperm families. However, few studies have attempted to build large phylogenetic trees of the family and use these for evaluating patterns of diversification or other macroevolutionary hypotheses. Two contrasting approaches can be used to generate large trees: supermatrix analyses and supertrees. In this paper, we evaluated the suitability of each of these methods for the study of patterns and processes of evolution in the grasses. We collected data from DDBJ/EMBL/GenBank to determine sequence availability and asked how far we are from a complete generic-level phylogenetic tree of the …
Inflorescence Architecture And Floral Morphology Of Aratitiyopea Lopezii (Xyridaceae), Lisa M. Campbell, Dennis Wm. Stevenson
Inflorescence Architecture And Floral Morphology Of Aratitiyopea Lopezii (Xyridaceae), Lisa M. Campbell, Dennis Wm. Stevenson
Aliso: A Journal of Systematic and Floristic Botany
Aratitiyopea lopezii is a robust perennial species of Xyridaceae from seasonally saturated, mid- to high-elevation, sandstone and granite sites in northern South America. The species lacks the scapose inflorescence characteristic of Xyridaceae and, having the gestalt of a rhizomatous bromeliad, it is seemingly aberrant in the family. However, closer examination confirms features consistent with the family and the previously noted morphological similarities to Orectanthe. Details of inflorescence structure and floral morphology are presented and compared to other genera of Xyridaceae.
An Electronic World Grass Flora, Steve Renvoize, Derek Clayton, Tom Cope, Helen Williamson
An Electronic World Grass Flora, Steve Renvoize, Derek Clayton, Tom Cope, Helen Williamson
Aliso: A Journal of Systematic and Floristic Botany
The development of an electronic world grass flora database is described in which data for 1090 morphological characters gathered for 11,000 species in 700 genera organized according to accepted names. This descriptive information is linked to a synonym database of 60,000 names. Authors, literature references, and the status of each name are also recorded in the database along with geographical distribution and type information. The list of accepted species is linked to a global herbarium of 350,000 specimens at Kew arranged in a phylogenetic sequence at the generic and species levels and according to broad phytogeographic divisions. From the database, …
Grass Phylogeny And Classification: Conflict Of Morphology And Molecules, Bryan K. Simon
Grass Phylogeny And Classification: Conflict Of Morphology And Molecules, Bryan K. Simon
Aliso: A Journal of Systematic and Floristic Botany
The grass family (Poaceae) has been recognized as a unique lineage for more than 200 years, based initially on characters of inflorescence and spikelet morphology and corroborated by anatomical and other features in the latter half of the twentieth century. There have been a number of attempts to derive a phylogeny of sections of the family from structural (morphological and anatomical) characters. However, more recently the Grass Phylogeny Working Group (2001) applied cladistic principles to the whole family using molecular and structural characters. This study produced a single most-parsimonious tree from six molecular sequence data sets, chloroplast restriction site data, …
Phenotypic Plasticity Of Reproduction In Schizachyrium Scoparium (Poaceae) Populations In Relation To Ecological History, Elizabeth M. Obee, James A. Quinn
Phenotypic Plasticity Of Reproduction In Schizachyrium Scoparium (Poaceae) Populations In Relation To Ecological History, Elizabeth M. Obee, James A. Quinn
Aliso: A Journal of Systematic and Floristic Botany
Genetic differentiation in reproduction in the wide-ranging Schizachyrium scoparium (Poaceae) has been demonstrated in uniform gardens. However, the fine-tuning of flowering phenology and biomass allocation in relation to spatial and temporal fluctuations in the local environment is best accomplished by plastic responses to local variability. An earlier central New Jersey study suggested that S. scoparium populations in old fields of 2 to 40 years differed in plasticity. To test this apparent effect of ecological history on the development of different levels of plasticity, genotypes were collected from high- and low-fertility sites in New Jersey (forest biome) and in Oklahoma (grassland …
Plasticity Of Chasmogamous And Cleistogamous Reproductive Allocation In Grasses, Gregory P. Cheplick
Plasticity Of Chasmogamous And Cleistogamous Reproductive Allocation In Grasses, Gregory P. Cheplick
Aliso: A Journal of Systematic and Floristic Botany
Cleistogamy is more common in grasses than in any other angiosperm family. Both self-fertilized cleistogamous (CL) spikelets and open-pollinated chasmogamous (CH) spikelets are typically produced. Relative allocation to CL and CH varies among species and populations, and is influenced by ontogeny and environment. The balance between reproductive modes can be expressed as a CH/CL ratio. This ratio is very plastic, and stressful conditions can result in values Amphicarpum purshii, an annual with subterranean CL spikelets, CH/CL declined as density increased because CH decreased more than CL as size was reduced by intraspecific competition. In the shade-tolerant annual Microstegium vimineum, …
Phenotypic Plasticity May Facilitate Invasion By Aegilops Triuncialis, Andrew R. Dyer
Phenotypic Plasticity May Facilitate Invasion By Aegilops Triuncialis, Andrew R. Dyer
Aliso: A Journal of Systematic and Floristic Botany
One great obstacle to understanding the invasion of nonnative species into native ecosystems is the lack of information on the population biology of the invading species. In particular, morphological and physiological adaptations and potential for phenotypic plasticity will strongly influence a species’ ability to persist and spread in newly invaded ecosystems. Phenotypic plasticity can buffer populations from selection thereby allowing them to survive the establishment phase of the invasion. The annual grass Aegilops triuncialis (Poaceae, Triticeae) has become highly invasive in California (USA) and provides an opportunity to investigate the importance of phenotypic plasticity to persistence and spread in new …
Systematics Of The Tribe Stipeae (Gramineae) Using Molecular Data, Surrey Jacobs, Randall Bayer, Joy Everett, Mirta Arriaga, Mary Barkworth, Alexandru Sabin-Badereau, Amelia Torres, Francisco Vázquez, Neil Bagnall
Systematics Of The Tribe Stipeae (Gramineae) Using Molecular Data, Surrey Jacobs, Randall Bayer, Joy Everett, Mirta Arriaga, Mary Barkworth, Alexandru Sabin-Badereau, Amelia Torres, Francisco Vázquez, Neil Bagnall
Aliso: A Journal of Systematic and Floristic Botany
Internal transcribed spacer (ITS) sequences have been determined for a wide range of stipoid grasses (Poaceae, Pooideae, Stipeae). Nardus was confirmed as the most appropriate outgroup. Anisopogon is consistently included among the stipoid genera. Lithachne and Oryza form a clade and are clearly not close to Stipeae, and there is no support for including Brachyelytrum within Stipeae. Ampelodesmos and Diarrhena do appear among the core taxa in some analyses, but their positions are unstable and the evidence for retaining them is limited. So far there is inadequate support for rejecting them from Stipeae, so they should be included in any …
Phylogeny Of Triticeae (Poaceae) Based On Three Organelle Genes, Two Single-Copy Nuclear Genes, And Morphology, Ole Seberg, Gitte Petersen
Phylogeny Of Triticeae (Poaceae) Based On Three Organelle Genes, Two Single-Copy Nuclear Genes, And Morphology, Ole Seberg, Gitte Petersen
Aliso: A Journal of Systematic and Floristic Botany
Triticeae are renowned for their complicated taxonomy, but their phylogeny is equally intricate and perplexing, and remains largely unresolved. Based on morphology and nucleotide sequences from two plastid genes (rbcL, rpoA), one mitochondrial gene (coxII), and two single-copy nuclear genes (DMC1, EF-G), the most comprehensive hypothesis (both with respect to taxa and data points) of the phylogeny of diploid Triticeae to date is presented. The incongruence length difference tests clearly indicate that the four logical data partitions (morphology and the three genome compartments) are mutually incongruent, except the mitochondrial and nuclear sequences. …
Allopolyploids Of The Genus Elymus (Triticeae, Poaceae): A Phylogenetic Perspective, Roberta J. Mason-Gamer
Allopolyploids Of The Genus Elymus (Triticeae, Poaceae): A Phylogenetic Perspective, Roberta J. Mason-Gamer
Aliso: A Journal of Systematic and Floristic Botany
The wheat tribe, Triticeae, includes many genomically distinct polyploid taxa. Elymus is an entirely allopolyploid genus, with all species containing the St genome of Pseudoroegneria. The St genome may be combined with one or more distinct genomes representing multiple, diverse diploid donors from throughout the tribe. This study includes a simultaneous phylogenetic analysis of new and previously published data from several distinct Elymus groups, including North American and Eurasian StStHH tetraploids, in which the H genome is derived from Hordeum, Eurasian StStYY tetraploids, in which the Y genome is derived from an unknown donor, and a putative StStStStHH …
A Preliminary Phylogenetic Analysis Of The Grass Subfamily Pooideae (Poaceae), With Attention To Structural Features Of The Plastid And Nuclear Genomes, Including An Intron Loss In Gbssi, Jerrold I Davis, Robert J. Soreng
A Preliminary Phylogenetic Analysis Of The Grass Subfamily Pooideae (Poaceae), With Attention To Structural Features Of The Plastid And Nuclear Genomes, Including An Intron Loss In Gbssi, Jerrold I Davis, Robert J. Soreng
Aliso: A Journal of Systematic and Floristic Botany
Phylogenetic relationships in the grass family (Poaceae), with specific attention to the internal structure of subfamily Pooideae, are analyzed on the basis of nucleotide sequence variation in plastid-encoded genes (matK, ndhF, ndhH, and rbcL). The resulting phylogenetic hypothesis was examined with attention to the taxonomic distributions of two inversions and an insertion/deletion within ndhF, the absence of intron 10 of the nuclear gene GBSSI (waxy), and positions of the boundaries between the Short Single Copy (SSC) region and the neighboring Inverted Repeat (IR) regions of the plastid genome, relative to the endpoints of ndh …
A Systematic Approach To Subtribe Loliinae (Poaceae: Pooideae) Based On Phylogenetic Evidence, Pilar Catalán, Pedro Torrecilla, José A. López-Rodríguez, Jochen Müller, Clive A. Stace
A Systematic Approach To Subtribe Loliinae (Poaceae: Pooideae) Based On Phylogenetic Evidence, Pilar Catalán, Pedro Torrecilla, José A. López-Rodríguez, Jochen Müller, Clive A. Stace
Aliso: A Journal of Systematic and Floristic Botany
Loliinae (Poaceae, Pooideae) encompass a large group of genera closely related to Festuca, the largest genus in the subtribe, which as traditionally circumscribed has been shown to be highly paraphyletic. In this investigation we combined molecular and morphological data representing 20 genera of Loliinae and closely related subtribes. Combined analysis of nucleotide sequences from the nuclear ITS and chloroplast trnL–F regions and structural characters recovered a consensus topology that shows Loliinae to be monophyletic and possessing two main clades—the fine-leaved Festuca clade that includes Ctenopsis, Micropyrum, Narduroides, Psilurus, Vulpia, and Wangenheimia, and …
Phylogeny Of Poa (Poaceae) Based On Trnt–Trnf Sequence Data: Major Clades And Basal Relationships, Lynn J. Gillespie, Annie Archambault, Robert J. Soreng
Phylogeny Of Poa (Poaceae) Based On Trnt–Trnf Sequence Data: Major Clades And Basal Relationships, Lynn J. Gillespie, Annie Archambault, Robert J. Soreng
Aliso: A Journal of Systematic and Floristic Botany
Poa, the largest genus of grasses (Poaceae) with over 500 species, occurs throughout temperate and boreal regions in both hemispheres. A phylogenetic study of Poa based on trnT–trnF chloroplast DNA sequence data is presented focusing on basal relationships, major clades, generic boundaries, and placement of putatively closely related genera. Results support the monophyly of the main lineage of Poa if subgen. Andinae is excluded and Anthochloa, Austrofestuca, Dissanthelium (at least in part), and Eremopoa are included. The main Poa clade and subgen. Andinae resolve within a strongly supported Poinae–Alopecurinae–Miliinae clade (PAM). The subdivision of …
Variability Of Bluegrass (Poa) In Siberia, Marina V. Olonova
Variability Of Bluegrass (Poa) In Siberia, Marina V. Olonova
Aliso: A Journal of Systematic and Floristic Botany
Siberian bluegrass (Poa) includes a number of polymorphic species such as P. arctica s.l., P. nemoralis s.l., P. palustris s.l., P. pratensis s.l., P. sibirica s.l., and P. smirnovii s.l., plus numerous hybrids and purported derivatives (e.g., P. attenuata s.l., P. glauca s.l., P. urssulensis s.l.). In Siberia Poa is represented by morphologically isolated species and hybrid-apomictic complexes, including both distinct species and taxonomic groups of obscure rank. Section Stenopoa is especially rich in these complexes. Most of the key morphological characters used in the taxonomy of bluegrass vary as much within populations as among populations and thus …
Preliminary Isozyme Evidence On The Hybrid Origin And Diploid Progenitors Of Bromus Pectinatus (Poaceae), Tatjana Oja
Preliminary Isozyme Evidence On The Hybrid Origin And Diploid Progenitors Of Bromus Pectinatus (Poaceae), Tatjana Oja
Aliso: A Journal of Systematic and Floristic Botany
Isozyme electrophoresis was used to study the origin of Bromus pectinatus (Poaceae, Pooideae). The morphological characteristics of B. pectinatus are intermediate between B. japonicus of sect. Bromus and B. tectorum of sect. Genea. Previous authors have suggested that sects. Bromus and Genea may be linked through B. pectinatus, a species that has been classified in sect. Bromus, though this placement has been questioned. Isozyme data support the allotetraploid nature of B. pectinatus and its position between sects. Bromus and Genea. Several heterozymes are consistent with the view that B. pectinatus may have arisen through polyploidization of …
Classification And Biogeography Of Panicoideae (Poaceae) In The New World, Fernando O. Zuloaga, Osvaldo Morrone, Gerrit Davidse, Susan J. Pennington
Classification And Biogeography Of Panicoideae (Poaceae) In The New World, Fernando O. Zuloaga, Osvaldo Morrone, Gerrit Davidse, Susan J. Pennington
Aliso: A Journal of Systematic and Floristic Botany
Panicoideae (Poaceae) in the New World comprise 107 genera (86 native) and 1357 species (1248 native). As circumscribed herein, Panicoideae include eight tribes: Andropogoneae, Arundinelleae, Centotheceae, Gynerieae, Isachneae, Paniceae, Steyermarkochloeae, and Thysanolaeneae. The two major tribes are Andropogoneae with 230 species (16.95% of all New World panicoids), and Paniceae with 1082 species (79.73%). Andropogoneae are divided into nine subtribes (Andropogoninae, Anthistiriinae, Coicinae, Germainiinae, Ischaeminae, Rottboelliinae, Saccharinae, Sorghinae, and Tripsacinae), while Paniceae are divided into seven subtribes (Arthropogoninae, Cenchrinae, Digitariinae, Melinidinae, Panicinae, Paspalinae, and Setariinae). Brazil is the center of diversity of New World panicoids with 741 species (54.6% of all …
Phylogenetic Relationships Within The Centothecoideae + Panicoideae Clade (Poaceae) Based On Ndhf And Rpl16 Intron Sequences And Structural Data, J. Gabriel Sánchez-Ken, Lynn G. Clark
Phylogenetic Relationships Within The Centothecoideae + Panicoideae Clade (Poaceae) Based On Ndhf And Rpl16 Intron Sequences And Structural Data, J. Gabriel Sánchez-Ken, Lynn G. Clark
Aliso: A Journal of Systematic and Floristic Botany
The PACCAD clade (Panicoideae, Arundinoideae, Chloridoideae, Centothecoideae, Aristidoideae, Danthonioideae) is well supported in all recent studies of Poaceae. However, phylogenetic relationships within the clade are still unresolved, although several branches are strongly supported. In this study, we focus on the phylogeny of the Centothecoideae + Panicoideae clade, one of the major lineages within the PACCAD clade, and one of the most diverse in the family. Two previously unsampled tribes, Isachneae and Steyermarkochloeae, are included, as are additional taxa of Centothecoideae. Phylogenetic analyses of plastid genome sequences (ndhF gene and rpl16 intron) and structural data show increased support …