Abstract:
UNLABELLED:• PREMISE OF THE STUDY:The evolution of invasiveness has been extensively studied in natural ecosystems; however, far less is known about the evolution of agricultural invasiveness, despite the major economic impact of weeds on crop productivity. Examining the population structure of recently arisen weeds can provide insights into evolutionary avenues to invasion of agroecosystems. Weeds that originate from wild plants are the most common yet least frequently studied type of agricultural invasive. Here we address several questions about the origin of the native North American agricultural weed waterhemp (Amaranthus tuberculatus), which invaded corn and soy fields in the midwestern United States in the 20th century.• METHODS:We genotyped 38 populations from across the species range with 10 microsatellite markers and used these data to assess genetic diversity and population structure within and outside the geographical region where waterhemp is agriculturally problematic.• KEY RESULTS:We found evidence for two ancestral genetic lineages in our data, supporting the hypothesis that A. tuberculatus was diverging into two evolutionary lineages prior to the 20th century. However, we found no support for the hypothesis that agricultural weed populations arose from admixture of these two lineages after secondary contact. Our data suggest that eastward movement of the western genetic lineage, facilitated by changing agricultural practices, is the source of the agricultural invasion of waterhemp.• CONCLUSIONS:This research demonstrates that agricultural invasion by native, wild plant species can proceed via different evolutionary trajectories from weeds related to domesticated plants, which has implications for evolutionary biology and weed control.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Waselkov KE,Olsen KMdoi
10.3732/ajb.1400064subject
Has Abstractpub_date
2014-10-01 00:00:00pages
1726-36issue
10eissn
0002-9122issn
1537-2197pii
ajb.1400064journal_volume
101pub_type
杂志文章abstract:PREMISE OF THE STUDY:The ecological and evolutionary significance of natural epigenetic variation (i.e., not based on DNA sequence variants) variation will depend critically on whether epigenetic states are transmitted from parents to offspring, but little is known on epigenetic inheritance in nonmodel plants. METHODS...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.1002/ajb2.1074
更新日期:2018-04-01 00:00:00
abstract::Incarvillea is a herbaceous and temperate member of Bignoniaceae, previously divided into four subgenera, Niedzwedzkia, Amphicome, Incarvillea, and Pteroscleris. Niedzwedzkia and Amphicome have in the past been treated as independent genera. Different relationships have been proposed for the four subgenera. Here, maxi...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.92.4.625
更新日期:2005-04-01 00:00:00
abstract:PREMISE OF THE STUDY:Factors shaping spatiotemporal patterns of associations in mutualistic systems are poorly understood. We used the lichen-forming fungi Peltigera and their cyanobacterial partners Nostoc to investigate the spatial structure of this symbiosis at an intrabiome scale and to identify potential factors s...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.1002/ajb2.1119
更新日期:2018-07-01 00:00:00
abstract::The genus Caltha (Ranunculaceae) consists of 10 species of low-growing, perennial herbs distributed throughout the moist temperate and cold regions of both the Northern and Southern Hemispheres. Traditionally, the species have been divided into two sections: section Psychrophila in the Southern Hemisphere with diploph...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.91.2.247
更新日期:2004-02-01 00:00:00
abstract:PREMISE OF THE STUDY:Several members of Selaginella are renowned for their ability to survive extreme drought and "resurrect" when conditions improve. Many of these belong to subgenus Tetragonostachys, a group of ∼45 species primarily found in North and Central America, with substantial diversity in the Sonoran and Chi...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1200426
更新日期:2013-08-01 00:00:00
abstract::Serpentine soils are a model system for the study of plant adaptation, speciation, and species interactions. Serpentine soil is an edaphically stressful, low productivity soil type that hosts stunted vegetation and a spectacular level of plant endemism. One of the first papers on serpentine plant endemism was by Arthu...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1300349
更新日期:2014-02-01 00:00:00
abstract::We used the chloroplast gene ndhF to reconstruct the phylogeny of the moonseed family (Menispermaceae), a morphologically diverse and poorly known cosmopolitan family of dioecious, primarily climbing plants. This study includes a worldwide sample of DNA sequences for 88 species representing 49 of the 70 genera of all ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.94.8.1425
更新日期:2007-08-01 00:00:00
abstract:UNLABELLED:• PREMISE OF THE STUDY:Floral traits play important roles in pollinator attraction and defense against floral herbivory. However, plants may experience trade-offs between conspicuousness to pollinators and herbivore attraction. Comparative studies provide an excellent framework to examine the role of multip...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1400171
更新日期:2014-08-01 00:00:00
abstract::Sequence data from the intron and spacer of the trnL-F chloroplast region elucidate the phylogenetic relationships of the tribe Diseae (Orchidoideae: Orchidaceae). Within Diseae, 41 species of Disa, two of Brownleea, three of Satyrium, and two of Corycium were included, with five species of Habenaria sensu lato (Orchi...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:2001-11-01 00:00:00
abstract:PREMISE OF THE STUDY:Hybridization and polyploidization (allopolyploidy) are ubiquitous in the evolution of plants, but tracing the origins and subsequent evolution of the constituent genomes of allopolyploids has been challenging. Genome doubling greatly complicates genetic analyses, and this has long hindered investi...
journal_title:American journal of botany
pub_type: 杂志文章,评审
doi:10.3732/ajb.1100395
更新日期:2012-02-01 00:00:00
abstract:PREMISE OF THE STUDY:It has been hypothesized that two flower types permit flexible allocation of resources to female and male functions, yet empirical evidence for the sex-allocation hypothesis remains scarce in gynomonoecious species. To characterize resource allocation to pistillate and perfect flowers and allocatio...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1600397
更新日期:2017-03-01 00:00:00
abstract:PREMISE OF THE STUDY:Over one-third of the native flowering plant species in the Hawaiian Islands are listed as federally threatened or endangered. Lack of sufficient pollination could contribute to reductions in populations, reproduction, and genetic diversity among these species but has been little studied. METHODS:...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.1002/ajb2.1233
更新日期:2019-02-01 00:00:00
abstract:PREMISE OF THE STUDY:This paper investigates the occurrence and evolution of aluminum (Al) accumulation within ferns and lycophytes, which is characterized by Al concentrations above 1000 mg·kg-1 in aboveground plant tissues. We hypothesize that this feature is more common in ferns than in angiosperms, and potentially ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1600381
更新日期:2017-04-01 00:00:00
abstract::Understanding the role of mother plants as pollen recipients in shaping mating patterns is essential for understanding the evolution of populations and in particular to predict the consequence of habitat fragmentation. Here, we investigated variation in mating patterns due to maternal phenotypic traits, phenological v...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.93.11.1650
更新日期:2006-11-01 00:00:00
abstract::Multicellularity has evolved at least once in every major eukaryotic clade (in all ploidy levels) and numerous times among the prokaryotes. According to a standard multilevel selection (MLS) model, in each case, the evolution of multicellularity required the acquisition of cell-cell adhesion, communication, cooperatio...
journal_title:American journal of botany
pub_type: 杂志文章,评审
doi:10.3732/ajb.1300314
更新日期:2014-01-01 00:00:00
abstract::Fitness of interspecific hybrids is sometimes high relative to their parents, despite the conventional belief that they are mostly unfit. F(1) hybrids between oilseed rape (Brassica napus) and weedy B. rapa can be significantly more fit than their weedy parents under some conditions; however, under other conditions th...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.90.4.571
更新日期:2003-04-01 00:00:00
abstract:PREMISE OF THE STUDY:Identifying recently diverged taxa can be useful for studying the process of speciation. Ipomoea lacunosa and I. cordatotriloba, along with a putative homoploid hybrid, I. ×leucantha, are closely related taxa, which are promising for investigating the early stages of speciation. The objectives of t...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1200467
更新日期:2013-11-01 00:00:00
abstract::Chrysothamnus nauseosus (Asteraceae) is a complex polymorphic shrub species widely distributed in western North America. In a study of 86 populations belonging to 15 subspecies, achene mass varied among populations over a sevenfold range. Achene mass was closely correlated with capitulum size at the subspecies level, ...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1997-04-01 00:00:00
abstract:PREMISE OF THE STUDY:Microsatellite loci were developed from Imperata cylindrica, a traditional medicinal herb in Asia and among the top 10 worst invasive weeds in the world, to aid in the identification of the limits of asexual clonal individuals. METHODS AND RESULTS:A total of 21 microsatellite markers, including 18...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1200152
更新日期:2012-11-01 00:00:00
abstract::The hollow stem of Equisetum giganteum owes its mechanical stability to an outer ring of strengthening tissue, which provides stiffness and strength in the longitudinal direction, but also to an inner lining of turgid parenchyma, which lends resistance to local buckling. With a height >2.5 m isolated stems are mechani...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1998-03-01 00:00:00
abstract::Very little is known regarding how repetitive elements evolve inpolyploid organisms. Here we address this subject by fluorescent insitu hybridization (FISH) of 20 interspersed repetitive elements tometaphase chromosomes of the cotton AD-genome tetraploid Gossypiumhirsutum and its putative A- and D-genome diploid ances...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1998-10-01 00:00:00
abstract:PREMISE OF THE STUDY:Populations of heterostylous species are characterized by two or three floral morphs with reciprocal positioning of stigmas and anthers. Theoretical models predict equal morph frequencies (isoplethy) when disassortative mating is prevalent in populations, but biased morph ratios may occur when vari...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.1600345
更新日期:2017-01-01 00:00:00
abstract::In monocarpic plants, reproduction is closely associated with senescence, which is itself often correlated to specific environmental signals. Floerkea proserpinacoides (Limnanthaceae) is a spring ephemeral annual of the deciduous forests of eastern North America. The phenology of its growth and reproduction is conside...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.92.3.438
更新日期:2005-03-01 00:00:00
abstract::The tribe Genisteae includes genera of great ecological importance in Mediterranean countries because they are dominant elements of many plant communities. Genetic variation and diversification patterns in Stauracanthus (Genisteae) provide information relevant for the study of the processes of diversification in relat...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.95.1.98
更新日期:2008-01-01 00:00:00
abstract::In turnip mitochondria the cox2 gene is partially contained within a 2-kb (kilobase) direct repeat that is the site of homologous recombination events that generate subgenomic molecules. Because of its partial presence within the direct repeat, the turnip cox2 gene exists in four genomic contexts, two on the master ch...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1998-02-01 00:00:00
abstract::Five plant communities in Western Australia, as well as selected desert and Rocky Mountain species of the western USA, were surveyed to evaluate associations among leaf structure, orientational properties, and the sunlight exposure and precipitation characteristic of each community. Selected leaf structural features h...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1998-01-01 00:00:00
abstract::Phylogenetic relationships were determined in the Araucariaceae, which are now found mainly in the Southern Hemisphere. This conifer family was well diversified and widely distributed in both hemispheres during the Mesozoic era. The sequence of 1322 bases of the rbcL gene of cpDNA was determined from 29 species of Ara...
journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1998-11-01 00:00:00
abstract::Viability of long-distance pollen links ecological models to the genetic structure of forest tree populations, determining how forests will adapt to climate change and how far genes flow from genetically modified (GM) pine plantations. Addressing this landscape-scale inquiry is feasible when the pollen source, the del...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.3732/ajb.0900255
更新日期:2010-05-01 00:00:00
abstract:PREMISE:Although hybridization has played an important role in the evolution of many plant species, phylogenetic reconstructions that include hybridizing lineages have been historically constrained by the available models and data. Restriction-site-associated DNA sequencing (RADseq) has been a popular sequencing techni...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.1002/ajb2.1352
更新日期:2019-09-01 00:00:00
abstract:PREMISE:The ecological implications of hyperaccumulation have been investigated at the organismal level, but are poorly understood at the plant community level. Questions addressed here were: Does the presence of selenium (Se) hyperaccumulators affect Se distribution and concentration in their native soil, and do hyper...
journal_title:American journal of botany
pub_type: 杂志文章
doi:10.1002/ajb2.1500
更新日期:2020-07-01 00:00:00