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American Journal of Botany

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https://www.readbyqxmd.com/read/28634257/two-fossil-species-of-metrosideros-myrtaceae-from-the-oligo-miocene-golden-fleece-locality-in-tasmania-australia
#1
Myall Tarran, Peter G Wilson, Michael K Macphail, Greg J Jordan, Robert S Hill
PREMISE OF THE STUDY: The capsular-fruited genus Metrosideros (Myrtaceae) is one of the most widely distributed flowering plant genera in the Pacific but is extinct in Australia today. The center of geographic origin for the genus and the reason for and timing of its extinction in Australia remain uncertain. We identify fossil Metrosideros fruits from the newly discovered Golden Fleece fossil flora in the Oligo-Miocene of Tasmania, Australia, shedding further light on these problems. METHODS: Standard paleopalynological techniques were used to date the fossil-bearing sediments...
June 20, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28634256/molecular-systematics-and-historical-biogeography-of-maianthemum-s-s
#2
Changkyun Kim, Kenneth M Cameron, Joo-Hwan Kim
PREMISE OF THE STUDY: Understanding the underlying mechanisms for the evolution of intercontinental disjunct patterns has long fascinated botanists. We present a molecular phylogenetic reconstruction of Maianthemum s.l. (including Smilacina) with a focus on Maianthemum s.s. species, which have a disjunct distribution between Eurasia and North America. Within this evolutionary framework, we clarify the systematic classification and biogeographical history of Maianthemum s.s. METHOD: Data from two nuclear and five chloroplast DNA regions were analyzed using the programs PAUP*, RAxML, MrBayes, BEAST, and RASP...
June 20, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28634255/population-genetic-structure-of-bromus-tectorum-in-the-mountains-of-western-north-america
#3
Spencer Arnesen, Craig E Coleman, Susan E Meyer
PREMISE OF THE STUDY: Invasive species are often initially restricted to a narrow range and may then expand through any of multiple mechanisms including phenotypic plasticity, in situ evolution, or selection on traits preadapted for new habitats. Our study used population genetics to explore possible processes by which the highly selfing invasive annual grass Bromus tectorum has expanded into montane environments. METHODS: We used 69 single nucleotide polymorphic (SNP) markers to genotype ca...
June 20, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28634254/widespread-paleopolyploidy-gene-tree-conflict-and-recalcitrant-relationships-among-the-carnivorous-caryophyllales
#4
Joseph F Walker, Ya Yang, Michael J Moore, Jessica Mikenas, Alfonso Timoneda, Samuel F Brockington, Stephen A Smith
PREMISE OF STUDY: The carnivorous members of the large, hyperdiverse Caryophyllales (e.g., Venus flytrap, sundews, and Nepenthes pitcher plants) represent perhaps the oldest and most diverse lineage of carnivorous plants. However, despite numerous studies seeking to elucidate their evolutionary relationships, the early-diverging relationships remain unresolved. METHODS: To explore the utility of phylogenomic data sets for resolving relationships among the carnivorous Caryophyllales, we sequenced 10 transcriptomes, including all the carnivorous genera except those in the rare West African liana family Dioncophyllaceae...
June 20, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28626040/pollinia-transfer-on-moth-legs-in-hoya-carnosa-apocynaceae
#5
Ko Mochizuki, Saori Furukawa, Atsushi Kawakita
PREMISE OF THE STUDY: The genus Hoya (Apocynaceae; Asclepiadoideae) is characterized by a set of complex floral characters unique among the asclepiads, but their role in pollination is poorly understood. Here, we report a new mechanism of asclepiad pollination in the wax plant Hoya carnosa: the pollinaria are transferred on the legs of medium or large settling moths. METHODS: Floral visitors and their behavior were observed on Amami-Oshima Island during 2013-2015, and the efficacy of different pollinators was determined by counting the pollinarium loads on different flower visitors...
June 16, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28626039/the-role-of-idioblasts-in-leaf-water-relations-of-tropical-rhododendron
#6
Tatpong Tulyananda, Erik T Nilsen
PREMISE OF THE STUDY: Although much is known about the anatomy of idioblasts, the relationship of leaf idioblasts to leaf physiology is poorly known. Our goal was to understand the relationship between idioblast abundance and leaf water relations. Tropical epiphytic and shrub Rhododendron species were the model system. METHODS: Leaf succulence and idioblast metrics of 61 plants representing 17 species were compared with stomatal and water relation metrics. Correlation, ANOVA, and regression were used to understand which water relation traits were best aligned with the proportion of the leaf occupied by idioblasts for epiphytic and shrub species...
June 16, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28626038/phenology-of-perennial-native-grass-belowground-axillary-buds-in-the-northern-mixed-grass-prairie
#7
Morgan L Russell, Lance T Vermeire, Amy C Ganguli, John R Hendrickson
PREMISE OF THE STUDY: Vegetative reproduction from belowground bud banks is the primary driver of grassland systems. Despite the importance of bud banks, the timing of recruitment and the crucial link between formation and maintenance is unknown. METHODS: We assessed patterns of belowground bud development, dormancy, and mortality associated with three perennial native grasses in the northern Great Plains. Temperature and soil moisture were measured below the soil surface to determine relationships with belowground bud development...
June 16, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28626037/autopolyploidization-geographic-origin-and-metabolome-evolution-in-arabidopsis-thaliana
#8
Fredd Vergara, Bart Rymen, Ayuko Kuwahara, Yuji Sawada, Muneo Sato, Masami Y Hirai
PREMISE OF THE STUDY: Autopolyploidy, or whole-genome duplication, is a recurrent phenomenon in plant evolution. Its existence can be inferred from the presence of massive levels of genetic redundancy revealed by comparative plant phylogenomics. Whole-genome duplication is theoretically associated with evolutionary novelties such as the development of new metabolic reactions and therefore contributes to the evolution of new plant metabolic profiles. However, very little is yet known about the impact of autopolyploidy on the metabolism of recently formed autopolyploids...
June 16, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28611073/population-genetic-structure-of-the-rock-outcrop-species-encholirium-spectabile-bromeliaceae-the-role-of-pollination-vs-seed-dispersal-and-evolutionary-implications
#9
Rodrigo C Gonçalves-Oliveira, Tina Wöhrmann, Ana M Benko-Iseppon, Florian Krapp, Marccus Alves, Maria das Graças L Wanderley, Kurt Weising
PREMISE OF THE STUDY: Inselbergs are terrestrial, island-like rock outcrop environments that present a highly adapted flora. The epilithic bromeliad Encholirium spectabile is a dominant species on inselbergs in the Caatinga of northeastern Brazil. We conducted a population genetic analysis to test whether the substantial phenotypic diversity of E. spectabile could be explained by limited gene flow among populations and to assess the relative impact of pollen vs. seed dispersal on the genetic structure of the species...
June 13, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28611072/decoupled-leaf-and-root-carbon-economics-is-a-key-component-in-the-ecological-diversity-and-evolutionary-divergence-of-deciduous-and-evergreen-lineages-of-genus-rhododendron
#10
Juliana S Medeiros, Jean H Burns, Jaynell Nicholson, Louisa Rogers, Oscar Valverde-Barrantes
PREMISE: We explored trait-trait and trait-climate relationships for 27 Rhododendron species while accounting for phylogenetic relationships and within-species variation to investigate whether leaf and root traits are coordinated across environments and over evolutionary time, as part of a whole-plant economics spectrum. METHODS: We examined specific leaf area (SLA) and four root traits: specific root length (SRL), specific root tip abundance (SRTA), first order diameter, and link average length, for plants growing in a cold, seasonal climate (Kirtland, Ohio) and a warmer, less seasonal climate (Federal Way, Washington) in the United States...
June 13, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28611071/seedling-response-to-environmental-variability-the-relationship-between-phenotypic-plasticity-and-evolutionary-history-in-closely-related-eucalyptus-species
#11
Susan Rutherford, Stephen P Bonser, Peter G Wilson, Maurizio Rossetto
PREMISE OF THE STUDY: Phenotypic plasticity is an important means through which organisms cope with environmental variability. We investigated seedling plasticity in the green ash eucalypts within a phylogenetic framework to examine the relationship between plasticity and evolutionary history. The green ashes are a diverse group, which include the tallest flowering plant in the world (Eucalyptus regnans) and a rare mallee less than 1 m tall (E. cunninghamii). METHODS: Seedlings of 12 species were exposed to high and low nutrient and water availability in a factorial experiment...
June 13, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28588138/when-are-species-invasions-useful-for-addressing-fundamental-questions-in-plant-biology
#12
Risa D Sargent, Amy L Angert, Jennifer L Williams
No abstract text is available yet for this article.
June 6, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28588137/the-real-significance-of-ancient-dna
#13
Laura Parducci, K D Bennett
No abstract text is available yet for this article.
June 6, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28533204/diverse-early-dwarf-mistletoes-arceuthobium-ecological-keystones-of-the-eocene-baltic-amber-biota
#14
Eva-Maria Sadowski, Leyla J Seyfullah, Carol A Wilson, Clyde L Calvin, Alexander R Schmidt
PREMISE OF THE STUDY: Extant dwarf mistletoes (Arceuthobium M. Bieb., Viscaceae) are hemiparasites with complex roles in nature. They are one of the most severe pests in northern hemisphere conifer forests, but they also enhance the structural complexity and species diversity of the forests. Here, we describe the first pre-Miocene macrofossils of dwarf mistletoes. The fossils from Eocene Baltic amber provide new insights into the morphological evolution of the Arceuthobium lineage and its paleobiogeography...
May 21, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28533203/floral-traits-influencing-plant-attractiveness-to-three-bee-species-consequences-for-plant-reproductive-success
#15
Austin A Bauer, Murray K Clayton, Johanne Brunet
PREMISE OF THE STUDY: The ability to attract pollinators is crucial to plants that rely on insects for pollination. We contrasted the roles of floral display size and flower color in attracting three bee species and determined the relationships between plant attractiveness (number of pollinator visits) and seed set for each bee species. METHODS: We recorded pollinator visits to plants, measured plant traits, and quantified plant reproductive success. A zero-inflated Poisson regression model indicated plant traits associated with pollinator attraction...
May 21, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28526727/inconvenient-realities-and-the-path-toward-science-based-forest-restoration-policies-a-reply-to-veldman-et-al
#16
Robin L Chazdon, Lars H Laestadius
No abstract text is available yet for this article.
May 19, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28526726/are-phloem-sieve-tubes-leaky-conduits-supported-by-numerous-aquaporins
#17
Ryan C Stanfield, Uwe G Hacke, Joan Laur
PREMISE OF THE STUDY: Aquaporin membrane water channels have been previously identified in the phloem of angiosperms, but currently their cellular characterization is lacking, especially in tree species. Pinpointing the cellular location will help generate new hypotheses of how membrane water exchange facilitates sugar transport in plants. METHODS: We studied histological sections of balsam poplar (Populus balsamifera L.) in leaf, petiole, and stem organs. Immuno-labeling techniques were used to characterize the distribution of PIP1 and PIP2 subfamilies of aquaporins along the phloem pathway...
May 19, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28526725/phylogeography-and-genetic-structure-of-endemic-acmispon-argophyllus-and-a-dendroideus-fabaceae-across-the-california-channel-islands
#18
Lisa E Wallace, Gregory L Wheeler, Mitchell E McGlaughlin, Gerald Bresowar, Kaius Helenurm
PREMISE OF THE STUDY: Taxa inhabiting the California Channel Islands exhibit variation in their degree of isolation, but few studies have considered patterns across the entire archipelago. We studied phylogeography of insular Acmispon argophyllus and A. dendroideus to determine whether infraspecific taxa are genetically divergent and to elucidate patterns of diversification across these islands. METHODS: DNA sequences were collected from nuclear (ADH) and plastid genomes (rpL16, ndhA, psbD-trnT) from >450 samples on the Channel Islands and California...
May 19, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28526724/highlights
#19
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
May 19, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28526723/anisotomous-dichotomy-results-from-an-unequal-bifurcation-of-the-original-shoot-apical-meristem-in-diphasiastrum-digitatum-lycopodiaceae
#20
Xiaofeng Yin, Roger D Meicenheimer
PREMISE OF THE STUDY: Two types of dichotomy are recognized in Lycopodiaceae: isotomous (equal) and anisotomous (unequal). Anisotomous dichotomy (anisotomy) has been hypothesized to result from unequal growth of an equal bifurcation of the original shoot apical meristem (SAM). Diphasiastrum digitatum (Lycopodiaceae) exhibits anisotomy at various locations. We thus used D. digitatum to test this classic hypothesis about anisotomy. METHODS: Transverse areas of original and derived SAMs of anisotomy exhibited by the rhizome and the vertical aerial vegetative stem were measured using scanning electron microscopy...
May 19, 2017: American Journal of Botany
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