Abstract：
:In the alpine landscape most plant populations are spatially isolated due to extreme patchiness and strong natural fragmentation. We used RAPD-PCR (randomly amplified polymorphic DNA polymerase chain reaction) for a study of the genetic diversity within and among 20 populations of Geum reptans, an outcrossing clonal plant species in the Swiss Alps. Populations were sampled at different altitudes, in early-, medium- and late-successional habitats (population origin) using a spatially hierarchical design, with distances among populations ranging from 0.2 to 208 km. Seed and pollen dispersibility was estimated by direct measurements. Seed dispersibility by wind was low with only 0.015% of the seeds flying over 100 m. Observed pollen flow was even more restricted. Molecular diversity within populations was irrespective of population origin (H(e) = 0.22 ± 0.004) and similar to the average of other RAPD studies. Contrary to our expectation, populations were only moderately differentiated (G(st) = 0.14). However, there was a clear spatial genetic structure and a positive relationship between pairwise genetic and geographic distances. Our results indicate considerable gene flow among populations within the same regional area, and we found no indication for genetic depletion during succession or in peripheral habitats. We conclude that, despite the high natural fragmentation and the importance of vegetative reproduction in this alpine plant, gene flow and repeated seedling recruitment during succession might be more frequent than commonly suggested.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Pluess AR,Stöcklin Jdoi
10.3732/ajb.91.12.2013subject
Has Abstractpub_date
2004-12-01 00:00:00pages
2013-21issue
12eissn
0002-9122issn
1537-2197pii
91/12/2013journal_volume
91pub_type
杂志文章abstract：UNLABELLED:• PREMISE OF THE STUDY:The growth limitation hypothesis (GLH) is the most accepted mechanistic explanation for treeline formation, although it is still uncertain whether it applies across taxa. The successful establishment of Pinus contorta--an exotic conifer species in the southern hemisphere--above the No...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1400166
更新日期：2014-05-01 00:00:00
abstract：:Traditional farming communities frequently maintain high levels of agrobiodiversity, so understanding their agricultural practices is a priority for biodiversity conservation. The cultural origin of agave spirits (mezcals) from west-central Mexico is in the southern part of the state of Jalisco where traditional farme...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0800176
更新日期：2009-02-01 00:00:00
abstract：:The vegetative cycle of the foliicolous lichen Phyllophiale, from propagule germination to propagule production, was studied by light microscope observation of thalli colonizing plastic cover slips placed within a lowland tropical forest. Discoid propagules germinated by growth of radially arranged fungal cells and de...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.11.1741
更新日期：2002-11-01 00:00:00
abstract：UNLABELLED: PREMISE OF THE STUDY:Microsatellite primers were developed in Paeonia lactiflora for further population genetic studies. • METHODS AND RESULTS:Ten dinucleotide microsatellite markers were developed using an enriched genomic library. They were identified in 58 individuals, and nine markers were also amplif...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100083
更新日期：2011-09-01 00:00:00
abstract：PREMISE OF THE STUDY:The fossil record of Agathis historically has been restricted to Australasia. Recently described fossils from the Eocene of Patagonian Argentina showed a broader distribution than found previously, which is reinforced here with a new early Paleocene Agathis species from Patagonia. No previous phylo...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1127
更新日期：2018-08-01 00:00:00
abstract：PREMISE OF THE STUDY:Plants adjust their phenology in response to seasonal cues experienced both by their parents and by themselves, and coordinating responses to these cues is necessary for expressing adaptive phenology. We investigated how cues are integrated across time to influence an important progeny phenotype, i...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1600389
更新日期：2017-04-01 00:00:00
abstract：:The phylogenetic structure of ferns (= monilophytes) is explored here, with a special focus on the early divergences among leptosporangiate lineages. Despite considerable progress in our understanding of fern relationships, a rigorous and comprehensive analysis of the early leptosporangiate divergences was lacking. Th...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.91.10.1582
更新日期：2004-10-01 00:00:00
abstract：:Size, allometry, and mechanical design were measured for trees of three canopy species in a tropical rain forest in French Guiana. Mechanical design was expressed as the safety factor, using the elastic-stability model, and the wind resistance factor, using the constant-stress model. Changes with ontogeny were describ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1998-02-01 00:00:00
abstract：:Temporal and demographic aspects of the growth of Botrychium gallicomontanum and B. mormo were studied for 2 yr. A total of 219 B. gallicomontanum and 412 B. mormo plants were monitored in a prairie and maple-basswood forest, respectively. Growth events were divided into four stages: leaf emergence, leaf separation, s...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.10.1624
更新日期：2002-10-01 00:00:00
abstract：:Plant xylem must balance efficient delivery of water to the canopy against protection from air entry into the conduits via air-seeding. We investigated the relationship between tracheid allometry, end wall pitting, safety from air-seeding, and the hydraulic efficiency of conifer wood in order to better understand the ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.93.9.1265
更新日期：2006-09-01 00:00:00
abstract：:Pedilanthus coalcomanensis was described from specimens collected by George B. Hinton in 1941 but was not collected again until 1999, when we found it in a tropical deciduous forest near Tehuantepec, in Chinicuila, Michoacán, Mexico. After analyzing Hinton's original collection notes, we concluded that this is the typ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.9.1485
更新日期：2002-09-01 00:00:00
abstract：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 transferre...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1700078
更新日期：2017-06-01 00:00:00
abstract：UNLABELLED: PREMISE OF THE STUDY:Polyploid speciation has been important in plant evolution. However, the conditions that favor the origination and persistence of polyploids are still not well understood. Here, we examine origins of 16 polyploid species in Mentzelia section Trachyphytum. • METHODS:We used phylogeny r...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900388
更新日期：2010-09-01 00:00:00
abstract：:Understanding the role of geography and ecology in species divergence is central to the study of evolutionary diversification. We used climatic, geographic, and biological data from nine wild Andean tomato species to describe each species' ecological niche and to evaluate the likely ecological and geographical modes o...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900216
更新日期：2010-04-01 00:00:00
abstract：:Genetic diversity at variable-number-tandem-repeat (VNTR) loci was examined in the common cattail, Typha latifolia (Typhaceae), using three synthetic DNA probes composed of tandemly repeated "core" sequences (GACA, GATA, and GCAC). The principal objectives of this investigation were to determine whether: (1) the previ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-09-01 00:00:00
abstract：:The timing, geographical locations, causes, and consequences of crop domestication have long been major concerns of archaeologists, and agricultural origins and dispersals are currently more relevant than ever to scientists seeking solutions to elusive problems involving food insecurity and global health disparities. ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1400145
更新日期：2014-10-01 00:00:00
abstract：:Tribe Macadamieae (91 spp., 16 genera; Proteaceae) is widespread across the southern hemisphere on all major fragments of Gondwana except New Zealand and India. Macadamia is cultivated outside its natural range as a "nut" crop (notably in Hawaii, where it is the principal orchard crop). We sampled seven DNA regions an...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0700006
更新日期：2008-07-01 00:00:00
abstract：:Contact forces are important in maintaining the twining habit of viny stems. A stem twining around a supporting pole puts itself into tension and uses a helical geometry to generate normal loads that are large relative to stem mass per unit length (Silk and Hubbard, Journal of Biomechanics 24(7):599-606, 1991). An ele...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1997-08-01 00:00:00
abstract：PREMISE OF THE STUDY:Eocene caldera-lake beds at Laguna del Hunco (LH, ca. 52.2 Ma) and Río Pichileufú (RP, ca. 47.7 Ma) in Argentine Patagonia provide copious information about the biological history of Gondwana. Several plant genera from these sites are known as fossils from southern Australia and New Zealand and sur...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100367
更新日期：2012-03-01 00:00:00
abstract：:Morphology and development of the female flowers in Geonoma interrupta are described and compared with other taxa within Arecaceae. Inflorescences are pleiothyrses. Cincinni are immersed in pits and arranged according to the Fibonacci pattern along the rachillae. The gynoecium is composed of three free carpels in earl...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.2.220
更新日期：2002-02-01 00:00:00
abstract：:Several alpine species have outlying populations in the lowlands and lower mountains north of the Alps. These small, isolated populations are usually described as either (1) glacial relics, (2) descendants from populations living on forelands and moraines during the ice ages, or (3) populations founded by long-distanc...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-04-01 00:00:00
abstract：PREMISE:Medullary bundles, i.e., vascular units in the pith, have evolved multiple times in vascular plants. However, no study has ever explored their anatomical diversity and evolution within a phylogenetic framework. Here, we investigated the development of the primary vascular system within Nyctaginaceae showing how...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1471
更新日期：2020-05-01 00:00:00
abstract：PREMISE OF THE STUDY:The apical meristem generates indeterminate apical growth of the stem and root of vascular plants. Our previous examination showed that shoot apical meristems (SAMs) can be classified into two types based on plasmodesmatal networks (PNs), which are important elements in symplasmic signaling pathway...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1153
更新日期：2018-09-01 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：:Nuclear and chloroplast DNA variation was assayed for two populations of Louisiana irises (Bayou Teche and Young's Coulee) that demonstrated extreme morphological variation and for a sample of the putative hybrid species, Iris nelsonii. The genetic markers examined in this analysis were diagnostic for either Iris fulv...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/j.1537-2197.1993.tb13843.x
更新日期：1993-05-01 00:00:00
abstract：:The North American plums are a closely related group that are not easily circumscribed, have overlapping morphologies, and are known to hybridize. We previously showed that the North American plums are a closely related, monophyletic group of taxa with little to no cpDNA sequence divergence between taxa. In that study...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.92.12.2011
更新日期：2005-12-01 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：:Hybridization and introgression play important roles in plant evolution, and their occurrence on the oceanic islands provides good examples of plant speciation and diversification. Restriction fragment length polymorphisms (RFLPs) and trnL (UAA) 3'exon-trnF (GAA) intergenic spacer (IGS) sequences of chloroplast DNA (c...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-06-01 00:00:00
abstract：UNLABELLED: PREMISE OF THE STUDY:Specific leaf area (SLA) is a critical component of the leaf economics spectrum, and many functional leaf traits have been empirically demonstrated to covary with SLA. However, a complete understanding of how change in leaf size influences SLA has not yet emerged. • METHODS:To help de...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000118
更新日期：2010-11-01 00:00:00
abstract：:Field surveys of cynipid gall-inducer occurrences on Quercus species were conducted in Florida, North Carolina, and Pennsylvania, USA. All cynipids demonstrated strong host species and organ fidelity. One result of this specialization is effective niche partitioning among cynipids. The host-association patterns of the...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1998-08-01 00:00:00
