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Articles 4711 - 4740 of 10756

Full-Text Articles in Botany

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 Dec 2007

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 …

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Phylogenetic Relationships Among The One-Flowered, Determinate Genera Of Bambuseae (Poaceae: Bambusoideae), Lynn G. Clark, Soejatmi Dransfield, Jimmy Triplett, J. Gabriel Sánchez-Ken Dec 2007

Phylogenetic Relationships Among The One-Flowered, Determinate Genera Of Bambuseae (Poaceae: Bambusoideae), Lynn G. Clark, Soejatmi Dransfield, Jimmy Triplett, J. Gabriel Sánchez-Ken

Aliso: A Journal of Systematic and Floristic Botany

Bambuseae (woody bamboos), one of two tribes recognized within Bambusoideae (true bamboos), comprise over 90% of the diversity of the subfamily, yet monophyly of the tribe is generally only moderately supported, and phylogenetic relationships within the tribe are poorly understood. In addition, there appears to be some level of conflict between morphological and molecular data within the tribe. We conducted a parsimony analysis of 43 species of Bambuseae, three of Olyreae (herbaceous bamboos), and two outgroup taxa using morphological and plastid rpl16 intron sequence data to (1) further test the monophyly of Bambuseae, (2) test the monophyly of Chusqueinae …

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Phylogenetics Of Chloridoideae (Gramineae): A Preliminary Study Based On Nuclear Ribosomal Internal Transcribed Spacer And Chloroplast Trnl–F Sequences, J. Travis Columbus, Rosa Cerros-Tlatilpa, Michael S. Kinney, Maria Elena Siqueiros-Delgado, Hester L. Bell, M. Patrick Griffith, Nancy F. Refulio-Rodriguez Dec 2007

Phylogenetics Of Chloridoideae (Gramineae): A Preliminary Study Based On Nuclear Ribosomal Internal Transcribed Spacer And Chloroplast Trnl–F Sequences, J. Travis Columbus, Rosa Cerros-Tlatilpa, Michael S. Kinney, Maria Elena Siqueiros-Delgado, Hester L. Bell, M. Patrick Griffith, Nancy F. Refulio-Rodriguez

Aliso: A Journal of Systematic and Floristic Botany

The phylogeny of Chloridoideae (Gramineae) was inferred from parsimony analyses of DNA sequences from two genomes—the chloroplast trnL intron, trnL 3' exon, and trnL–F intergenic spacer, and the nuclear ribosomal internal transcribed spacer region (ITS1 + 5.8S + ITS2). Eighty species representing 66 chloridoid genera were sampled, including all but four of the native New World genera. Analyses of the individual and combined data sets were performed. The phylogenies were found to be highly congruent. Of the four tribes and seven subtribes of Chloridoideae sensu Clayton and Renvoize (1986) whose phylogenetic status could be tested with our …

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Arkansas Corn And Grain Sorghum Performance Tests 2007, D. G. Dombek, R. D. Bond, I. L. Eldridge, R. M. Pryor Dec 2007

Arkansas Corn And Grain Sorghum Performance Tests 2007, D. G. Dombek, R. D. Bond, I. L. Eldridge, R. M. Pryor

Arkansas Agricultural Experiment Station Research Series

Corn and grain sorghum performance tests are conducted each year in Arkansas by the University of Arkansas Division of Agriculture. The tests provide information to companies marketing seed within the state, and aid the Arkansas Cooperative Extension Service in formulating recommendations for producers.

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Arkansas Soybean Performance Tests 2007, D. G. Dombek, R. D. Bond, I. L. Eldridge, R. M. Pryor Dec 2007

Arkansas Soybean Performance Tests 2007, D. G. Dombek, R. D. Bond, I. L. Eldridge, R. M. Pryor

Arkansas Agricultural Experiment Station Research Series

Soybean cultivar performance tests are conducted each year in Arkansas by the University of Arkansas Division of Agriculture. The tests provide information to companies developing cultivars and/or marketing seed within the State, and aid the Arkansas Cooperative Extension Service in formulating cultivar recommendations for soybean producers.

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Sfa Gardens Newsletter, Fall 2007, Sfa Gardens, Stephen F. Austin State University Oct 2007

Sfa Gardens Newsletter, Fall 2007, Sfa Gardens, Stephen F. Austin State University

SFA Gardens Newsletters

No abstract provided.

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Summaries Of Arkansas Cotton Research 2006, Derrick M. Oosterhuis Oct 2007

Summaries Of Arkansas Cotton Research 2006, Derrick M. Oosterhuis

Arkansas Agricultural Experiment Station Research Series

No abstract provided.

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Vitis Riparia Michx., Barbara S. Carlsward Sep 2007

Vitis Riparia Michx., Barbara S. Carlsward

Specimens by Name

No abstract provided.

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Ampelopsis Brevipedunculata (Maxim.) Trautv., Martin G. Bennett Sep 2007

Ampelopsis Brevipedunculata (Maxim.) Trautv., Martin G. Bennett

Specimens by Name

No abstract provided.

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Caryopteris Incana Miq., Evelyn Means, Laurie Glaysher, Joyce Beck Sep 2007

Caryopteris Incana Miq., Evelyn Means, Laurie Glaysher, Joyce Beck

Specimens by Name

No abstract provided.

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Morus Rubra L., Isaac Klaus Sep 2007

Morus Rubra L., Isaac Klaus

Specimens by Name

No abstract provided.

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Acer Rubrum Wats., Gordon C. Tucker Sep 2007

Acer Rubrum Wats., Gordon C. Tucker

Specimens by Name

No abstract provided.

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Acer Saccharinum L., Gordon C. Tucker Sep 2007

Acer Saccharinum L., Gordon C. Tucker

Specimens by Name

No abstract provided.

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Verbena Urticifolia L., Gordon C. Tucker Sep 2007

Verbena Urticifolia L., Gordon C. Tucker

Specimens by Name

No abstract provided.

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Vascular Flora Of Powhatan County, Virginia, Michael Austin Terry, W. John Hayden Sep 2007

Vascular Flora Of Powhatan County, Virginia, Michael Austin Terry, W. John Hayden

Biology Faculty Publications

Powhatan County is a largely rural county of the Virginia piedmont currently experiencing exurban development pressure. Commercial pine forests occupy much of the land area; most natural vegetation occurs in various hardwood forests. Plant life is supported largely by soils derived from Proterozoic to Paleozoic metamorphic and igneous rocks, soils developed over Triassic basins, and riparian soils associated with the James and Appomattox Rivers. The annotated checklist is based on new collections gathered between September 2003 and August 2005, supplemented with records from regional herbaria and the Atlas of the Virginia Flora. Field work sampled at least 12 distinct community …

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Parthenocissus Quinquefolia (L.) Planch., Kerry Barringer Aug 2007

Parthenocissus Quinquefolia (L.) Planch., Kerry Barringer

Specimens by Name

No abstract provided.

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Vitis Labrusca L., Kerry Barringer Aug 2007

Vitis Labrusca L., Kerry Barringer

Specimens by Name

No abstract provided.

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Fraxinus Americana L., Kerry Barringer Aug 2007

Fraxinus Americana L., Kerry Barringer

Specimens by Name

No abstract provided.

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Myoporum Montanum R. Br., P. C. Jobson, D. M. Bell, J. T. Hunter Aug 2007

Myoporum Montanum R. Br., P. C. Jobson, D. M. Bell, J. T. Hunter

Specimens by Name

No abstract provided.

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Goodyera Pubescens (Willd.) R. Br., Steven D. Giann Aug 2007

Goodyera Pubescens (Willd.) R. Br., Steven D. Giann

Specimens by Name

No abstract provided.

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Heritability Of Latent Period Estimated From Wild-Type And Selected Populations Of Puccinia Triticina, Jeffery S. Lehman, Gregory Shaner Aug 2007

Heritability Of Latent Period Estimated From Wild-Type And Selected Populations Of Puccinia Triticina, Jeffery S. Lehman, Gregory Shaner

Biology and Earth Science Faculty Scholarship

Durability of partially resistant wheat cultivars to wheat leaf rust depends on the amount of genetic variation in parasitic fitness within populations of the pathogen Puccinia triticina. To assess the durability of partial resistance, selection experiments were used to explore quantitative variation in parasitic fitness of P. triticina. Fungal populations 881-WT and 882-WT were selected for shortened latent period on partially resistant cvs. CI 13277 and Sw 72469-6 for multiple generations. Fitness components were measured for wild-type and selected fungal populations. Responses to selection and selection differentials were calculated, and broad-sense, realized heritabilities for latent period were estimated for wild-type …

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Arkansas Small-Grain Cultivar Performance Tests 2006-2007, J. T. Kelly, M. J. Emerson, R. K. Bacon, E. A. Milus Aug 2007

Arkansas Small-Grain Cultivar Performance Tests 2006-2007, J. T. Kelly, M. J. Emerson, R. K. Bacon, E. A. Milus

Arkansas Agricultural Experiment Station Research Series

Small-grain cultivar performance tests are conducted each year in Arkansas by the Arkansas Agricultural Experiment Station, Department of Crop, Soil, and Environmental Sciences. The tests provide information to companies developing cultivars and/or marketing seed within the state and aid the Arkansas Cooperative Extension Service in formulating cultivar recommendations for smallgrain producers.

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B.R. Wells Rice Research Studies 2006, R. J. Norman, J. F. Meullenet, K. A.K. Moldenhauer Aug 2007

B.R. Wells Rice Research Studies 2006, R. J. Norman, J. F. Meullenet, K. A.K. Moldenhauer

Arkansas Agricultural Experiment Station Research Series

No abstract provided.

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Ranunculus Arvensis (Ranunculaceae), An Alien Weed New To Southern California, Richard E. Riefner Jr, Steve Boyd Jul 2007

Ranunculus Arvensis (Ranunculaceae), An Alien Weed New To Southern California, Richard E. Riefner Jr, Steve Boyd

Aliso: A Journal of Systematic and Floristic Botany

We report the first known records of Ranunculus arvensis from southern California. This alien species shows a tendency to behave as a facultative wetland plant, and could become a pest in scoured washes and flood plains, ephemeral pools, and on disturbed stream banks in the coastal lowlands.

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Distribution Patterns Of Great Basin Conifers: Implications Of Extinction And Immigration, David A. Charlet Jul 2007

Distribution Patterns Of Great Basin Conifers: Implications Of Extinction And Immigration, David A. Charlet

Aliso: A Journal of Systematic and Floristic Botany

Factors influencing the distribution of scattered montane conifers on mountaintops in the Great Basin of North America were investigated. The sources of data were collections and observations on more than 300 mountain ranges in the region. All mountains in the region with at least one montane conifer species and all adjacent source areas were included in the data set. In all, 164 montane island sites and 40 mainland sites were used in the analyses. Physical data for each site were compiled and regression analyses were conducted to test the predictions of three island biogeography models: immigration, extinction, and equilibrium. These …

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Reassessment Of Yucca Brevifolia And Recognition Of Y. Jaegeriana As A Distinct Species, Lee W. Lenz Jul 2007

Reassessment Of Yucca Brevifolia And Recognition Of Y. Jaegeriana As A Distinct Species, Lee W. Lenz

Aliso: A Journal of Systematic and Floristic Botany

A brief historical account of the Joshua tree (Yucca brevifolia, Agavaceae) is presented. The geographical distribution, morphological and pollinator differences between subsp. brevifolia and subsp. jaegeriana are examined and the latter is raised to specific rank. The fossil Protoyucca and its possible relationship to the Joshua trees are considered together with implications as to the possible origin of the genus.

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Vascular Plants Of The Whipple Mountains, Sarah J. De Groot Jul 2007

Vascular Plants Of The Whipple Mountains, Sarah J. De Groot

Aliso: A Journal of Systematic and Floristic Botany

The Sonoran and Mojave deserts meet just north of the Whipple Mountains, which are situated in southeast San Bernardino County, California, along the Colorado River and adjacent to Arizona. Vegetation from the Pleistocene to the present was inferred from previously published packrat midden data and the current floristic composition. Climate data suggest that summer rainfall is a factor underlying the vegetational differences between the western and eastern portions of the Sonoran desert. Plant collections in the area yielded primarily California Sonoran plants, but also several Mojave and Arizona Sonoran plants. A fair number of the Arizona Sonoran plants collected were …

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Wood Anatomy Of Crossosomatales: Patterns Of Wood Evolution With Relation To Phylogeny And Ecology, Sherwin Carlquist Jul 2007

Wood Anatomy Of Crossosomatales: Patterns Of Wood Evolution With Relation To Phylogeny And Ecology, Sherwin Carlquist

Aliso: A Journal of Systematic and Floristic Botany

The seven families hypothesized by Sosa and Chase to comprise Crossosomatales possess relatively long vessel elements with scalariform perforation plates and scalariform to opposite vessel-ray pitting; tracheids; diffuse axial parenchyma; and heterogeneous rays. These and other primitive character states do not indicate relationships, but they do not offer any evidence against the idea that Crossosomatales are a natural order. Departures from the primitive character states are related to ecological adaptations. Crossosomataceae have simple perforation plates (scalariform briefly at the beginning of the secondary xylem), a feature correlated with the seasonal aridity of habitats occupied by the family, the sole family …

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A Brief Nomenclatural Review Of Genera And Tribes In Theaceae, Linda M. Prince Jul 2007

A Brief Nomenclatural Review Of Genera And Tribes In Theaceae, Linda M. Prince

Aliso: A Journal of Systematic and Floristic Botany

The angiosperm family Theaceae has been investigated extensively with a rich publication record of anatomical, cytological, paleontological, and palynological data analyses and interpretation. Recent developmental and molecular data sets and the application of cladistic analytical methods support dramatic changes in circumscription at the familial, tribal, and generic levels. Growing interest in the family outside the taxonomic and systematic fields warrants a brief review of the recent nomenclatural history (mainly 20th century), some of the classification systems currently in use, and an explanation of which data support various classification schemes. An abridged bibliography with critical nomenclatural references is provided.

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Notes On Native Vascular Plants From Mima Mound-Vernal Pool Terrain And The Importance Of Preserving Coastal Terraces In Orange County, California, Richard E. Riefner Jr., Steve Boyd, Roy J. Shlemon Jul 2007

Notes On Native Vascular Plants From Mima Mound-Vernal Pool Terrain And The Importance Of Preserving Coastal Terraces In Orange County, California, Richard E. Riefner Jr., Steve Boyd, Roy J. Shlemon

Aliso: A Journal of Systematic and Floristic Botany

We report the following noteworthy collections of native vascular plants from mima mound fields in coastal Orange County, California: Deschampsia danthonioides, Lepidium strictum, and Sagina saginoides (new county records), Lepidium oblongum var. oblongum (previously excluded from the flora), Deinandra paniculata, Holocarpha virgata subsp. elongata, and Navarretia prostrata (new localities in the county), and Hordeum brachyantherum subsp. californicum (uncommon species of local interest). A herbarium study, preparation of voucher specimens, and a generalized distribution, facultative wetland status, and taxonomic notes, where appropriate, are cited for each taxon. An overview of the mima mound micro-relief associated with coastal …

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