journal
MENU ▼
Read by QxMD icon Read
search

American Journal of Botany

journal
https://www.readbyqxmd.com/read/28827452/the-ontogenetic-bases-for-variation-in-ovary-position-in-melastomataceae
#1
João Paulo Basso-Alves, Renato Goldenberg, Simone Pádua Teixeira
PREMISE OF THE STUDY: Although the ovary position is considered a stable character in angiosperms, Melastomataceae species have perigynous flowers in which the ovary varies from superior to inferior. Thus, we investigated the ontogenetic process involved in variation of the ovary position in Melastomataceae. We focused on histogenesis of the floral apex in search of developmental patterns for each type of ovary position. METHODS: Six species in which the ovary varies from superior to inferior were chosen: Henriettea saldanhae, Leandra melastomoides, Miconia dodecandra, Microlicia euphorbioides, Rhynchanthera grandiflora, and Tibouchina clinopodifolia...
August 21, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28827451/comparative-transcriptomics-indicate-changes-in-cell-wall-organization-and-stress-response-in-seedlings-during-spaceflight
#2
Christina M Johnson, Aswati Subramanian, Sivakumar Pattathil, Melanie J Correll, John Z Kiss
PREMISE OF THE STUDY: Plants will play an important role in the future of space exploration as part of bioregenerative life support. Thus, it is important to understand the effects of microgravity and spaceflight on gene expression in plant development. METHODS: We analyzed the transcriptome of Arabidopsis thaliana using the Biological Research in Canisters (BRIC) hardware during Space Shuttle mission STS-131. The bioinformatics methods used included RMA (robust multi-array average), MAS5 (Microarray Suite 5...
August 21, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28814407/fungal-endophyte-communities-in-the-temperate-fern-polystichum-munitum-show-early-colonization-and-extensive-temporal-turnover
#3
Brett S Younginger, Daniel J Ballhorn
PREMISE OF THE STUDY: Fungal endophytes have been shown to colonize all land plants, yet surprisingly little attention has been given to their community composition in ferns. We examined the diversity and temporal turnover of fungal endophytes in foliar tissue of the temperate western sword fern, Polystichum munitum, comparing taxa in newly emerged leaflets and in the same fronds after 1 mo of exposure in the field. METHODS: Utilizing next-generation sequencing, we sampled pinnae from P...
August 16, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28814406/comparative-epigenetic-and-genetic-spatial-structure-of-the-perennial-herb-helleborus-foetidus-isolation-by-environment-isolation-by-distance-and-functional-trait-divergence
#4
Carlos M Herrera, Mónica Medrano, Pilar Bazaga
PREMISE OF THE STUDY: Epigenetic variation can play a role in local adaptation; thus, there should be associations among epigenetic variation, environmental variation, and functional trait variation across populations. This study examines these relationships in the perennial herb Helleborus foetidus (Ranunculaceae). METHODS: Plants from 10 subpopulations were characterized genetically (AFLP, SSR markers), epigenetically (MSAP markers), and phenotypically (20 functional traits)...
August 16, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28814405/can-asexuality-confer-a-short-term-advantage-investigating-apparent-biogeographic-success-in-the-apomictic-triploid-fern-myriopteris-gracilis
#5
David A Wickell, Michael D Windham, Xiaofei Wang, Stuart J Macdonald, James B Beck
PREMISE OF THE STUDY: Although asexual taxa are generally seen as evolutionary dead ends, asexuality appears to provide a short-term benefit in some taxa, including a wider geographic distribution compared to sexual relatives. However, this may be an illusion created by multiple, morphologically cryptic, asexual lineages, each occupying a relatively small area. In this study we investigate the role of multiple lineages in the biogeography of Myriopteris gracilis Fée (Pteridaceae), a North American apomictic triploid fern species with a particularly large range...
August 16, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28814404/adaptive-spatiotemporal-changes-in-morphology-anatomy-and-mechanics-during-the-ontogeny-of-subshrubs-with-square-shaped-stems
#6
Ruwen Kaminski, Thomas Speck, Olga Speck
PREMISE OF THE STUDY: Plant stems can be regarded as fiber-reinforced structures characterized by anatomical heterogeneity, mechanical anisotropy, and adaptability to changing internal and external constraints. Our study focused on adaptive spatiotemporal changes in morphology, anatomy, and mechanical properties during the ontogeny of Leonurus cardiaca L. (Lamiaceae) internodes, proving considerable functional adaptability. METHODS: Four-point bending tests and torsional tests were carried out on the same internodes to measure flexural and torsional stiffness...
August 16, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28794059/evolution-and-development-of-monocot-stomata
#7
Paula J Rudall, Elisabeth D Chen, Erin Cullen
PREMISE OF THE STUDY: Leaves of monocots are typically linear with parallel venation, though a few taxa have broad leaves. Studies of stomatal patterning and development in monocots required updating in the context of rapidly improving knowledge of both the phylogenetic and development-genetic context of monocots that facilitate studies of character evolution. METHODS: We used an existing microscope-slide collection to obtain data on stomatal structure across all the major monocot clades, including some species with relatively broad leaves...
August 9, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28794058/floristic-response-to-urbanization-filtering-of-the-bioregional-flora-in-indianapolis-indiana-usa
#8
Rebecca W Dolan, Myla F J Aronson, Andrew L Hipp
PREMISE OF THE STUDY: Globally, urban plant populations are becoming increasingly important, as these plants play a vital role in ameliorating effects of ecosystem disturbance and climate change. Urban environments act as filters to bioregional flora, presenting survival challenges to spontaneous plants. Yet, because of the paucity of inventory data on plants in landscapes both before and after urbanization, few studies have directly investigated this effect of urbanization. METHODS: We used historical, contemporary, and regional plant species inventories for Indianapolis, Indiana USA to evaluate how urbanization filters the bioregional flora based on species diversity, functional traits, and phylogenetic community structure...
August 9, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28790090/learning-in-two-butterfly-species-when-using-flowers-of-the-tropical-milkweed-asclepias-curassavica-no-benefits-for-pollination
#9
Bruna de Cássia Menezes Ramos, Miguel Angel Rodríguez-Gironés, Daniela Rodrigues
PREMISE OF THE STUDY: The ability of insect visitors to learn to manipulate complex flowers has important consequences for foraging efficiency and plant fitness. We investigated learning by two butterfly species, Danaus erippus and Heliconius erato, as they foraged on the complex flowers of Asclepias curassavica, as well as the consequences for pollination. METHODS: To examine learning with respect to flower manipulation, butterflies were individually tested during four consecutive days under insectary conditions...
August 8, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28790089/out-of-one-many-the-biodiversity-considerations-of-polyploidy
#10
Robert G Laport, Julienne Ng
No abstract text is available yet for this article.
August 8, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28790088/transitions-from-distyly-to-homostyly-are-associated-with-floral-evolution-in-the-buckwheat-genus-fagopyrum
#11
Ling-Yun Wu, Bo Wang, Daniel J Schoen, Shuang-Quan Huang
PREMISE OF THE STUDY: Documenting trait transitions among species with dimorphic flowers can help to test whether similar patterns of selection are responsible for divergence in floral traits among different species. Heterostyly is thought to promote outcrossing. Theory suggests that the evolutionary transition from heterostylous to homostylous flowers should be accompanied by a reduction in floral size in which pollen size and style length are expected to covary. Patterns of such correlated floral trait evolution have not, however, been widely examined...
August 8, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28790087/karyological-patterns-in-the-european-endemic-genus-soldanella-l-absolute-genome-size-variation-uncorrelated-with-cytotype-chromosome-numbers
#12
Eliška Štubňová, Iva Hodálová, Jaromír Kučera, Lenka Mártonfiová, Marek Svitok, Marek Slovák
PREMISE OF THE STUDY: Detailed knowledge about the karyological diversity of organisms undoubtedly represents one of the crucial steps toward a better understanding of their evolutionary trends and history. We investigated the cytotype and absolute genome size (AGS) patterns in the European mountain-dwelling genus Soldanella (Primulaceae) in light of its geographic distribution and ecological diversification. METHODS: Our chromosome number survey was based on 34 newly determined and 125 previously published chromosome counts...
August 8, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28754766/divergent-evolution-and-niche-differentiation-within-the-common-peatmoss-sphagnum-magellanicum
#13
Narjes Yousefi, Kristian Hassel, Kjell Ivar Flatberg, Petri Kemppainen, Emiliano Trucchi, A Jonathan Shaw, Magni Olsen Kyrkjeeide, Péter Szövényi, Hans K Stenøien
PREMISE OF THE STUDY: Populations with phenotypic polymorphism in discrete characters may be good models for investigating genome evolution and speciation. Sphagnum magellanicum Brid. is found throughout the northern hemisphere, and despite considerable variation in morphological characters, it is considered one of the least taxonomically controversial peatmoss species. We have observed two main morphs of the species associated with different microhabitats. Here we investigated the genomic and environmental basis of this intraspecific morphological variation...
July 28, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28754765/intraspecific-life-history-variation-in-contrasting-habitats-insights-from-an-obligate-symbiotic-organism
#14
Sonia Merinero, Gregorio Aragón, Isabel Martínez
PREMISE OF THE STUDY: Life history theory predicts that plants in unfavorable habitats for juvenile growth and survival will commence reproduction at smaller sizes and exhibit higher reproductive allocations than those in favorable habitats. The scope of life history theory will increase if these predictions apply to a broad range of organisms. Populations of organisms in contrasting habitats may experience different demographic rates. Thus, we compared the demography and life history traits of a lichen species in contrasting habitats...
July 28, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28754764/plastome-sequences-of-an-ancient-fern-lineage-reveal-remarkable-changes-in-gene-content-and-architecture
#15
Paulo H Labiak, Kenneth G Karol
PREMISE OF THE STUDY: Comparative analyses of plastid genomes have suggested that gene order and content are relatively stable across the main groups of land plants, with significant changes rarely reported. We examine plastome organization and RNA editing in ferns and report changes that add valuable information on plastome evolution in land plants. METHODS: Using next-generation sequencing methods, we fully sequenced plastomes from three species of Schizaeaceae, and compared their plastomes with other groups of land plants to study changes in gene composition, plastome architecture, and putative RNA editing sites...
July 28, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28751529/first-discovery-of-the-charophycean-green-alga-lychnothamnus-barbatus-charophyceae-extant-in-the-new-world
#16
Kenneth G Karol, Paul M Skawinski, Richard M McCourt, Michelle E Nault, Reesa Evans, Martha E Barton, Matthew S Berg, Donna J Perleberg, John D Hall
PREMISE OF THE STUDY: Although some species of Characeae, known as stoneworts, can be found on every continent except Antarctica, many species and some genera have limited geographic distributions. The genus Lychnothamnus, represented by a single extant species L. barbatus, was known only from scattered localities in Europe and Australasia until it was recently discovered in North America. METHODS: Morphological identifications were made from specimens collected in Minnesota and Wisconsin, USA...
July 27, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28751528/highlights-a-quick-glance-at-noteworthy-articles-in-this-month-s-issue
#17
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
July 27, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28743760/high-growth-temperatures-and-high-soil-nitrogen-do-not-alter-differences-in-co2-assimilation-between-invasive-phalaris-arundinacea-reed-canarygrass-and-carex-stricta-tussock-sedge
#18
Elizabeth F Waring, A Scott Holaday
PREMISE OF THE STUDY: Global change in temperature and soil nitrogen availability could affect plant community composition, potentially giving an advantage to invasive species compared to native species. We addressed how high temperatures affected CO2 assimilation parameters for invasive Phalaris arundinacea and a sedge, Carex stricta, it displaces, in natural and controlled environments. METHODS: Photosynthetic parameters were measured in a wetland in Indiana, USA during the abnormally warm year of 2012...
July 25, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28743759/anatolian-origins-and-diversification-of-aethionema-the-sister-lineage-of-the-core-brassicaceae
#19
Setareh Mohammadin, Kim Peterse, Sara J van de Kerke, Lars W Chatrou, Ali A Dönmez, Klaus Mummenhoff, J Chris Pires, Patrick P Edger, Ihsan A Al-Shehbaz, M Eric Schranz
PREMISE OF THE STUDY: The Irano-Turanian region harbors three biodiversity hotspots and ∼25% of Brassicaceae species are endemic to the region. Aethionema (∼61 species) is the sister lineage to the core Brassicaceae and occurs mainly in the Irano-Turanian region. The evolutionary important position of Aethionema makes it an ideal reference for broader comparative genetics and genomics. To understand the evolution of Aethionema, and for a broader understanding of crucifer evolution, a time-calibrated phylogenetic tree and biogeographical history of the genus is needed...
July 25, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28724594/harnessing-plant-spectra-to-integrate-the-biodiversity-sciences-across-biological-and-spatial-scales
#20
Jeannine Cavender-Bares, John A Gamon, Sarah E Hobbie, Michael D Madritch, José Eduardo Meireles, Anna K Schweiger, Philip A Townsend
No abstract text is available yet for this article.
July 19, 2017: American Journal of Botany
journal
journal
23296
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"