Abstract：
:Recent molecular phylogenetic studies of Solanaceae have identified many well-supported clades within the family and have permitted the creation of a phylogenetic system of classification. Here we estimate the phylogeny for Iochrominae, a clade of Physaleae sensu Olmstead et al. (1999), which contains 34 Andean species encompassing an immense diversity of floral forms and colors. Using three nuclear regions, ITS, the second intron of LEAFY, and exons 2 to 9 of the granule-bound starch synthase gene (waxy), we evaluated the monophyly of the traditional genera comprising Iochrominae and assessed the extent of interspecific hybridization within the clade. Only one of the six traditionally recognized genera of Iochrominae was supported as monophyletic. Further, comparison of the individual nuclear data sets revealed two interspecific hybrid taxa and a third possible case. These hybrid taxa occur in the Amotape-Huancabamba zone, a region between the northern and central Andes that has the greatest diversity of Iochroma species and offers frequent opportunities for hybridization in areas of sympatry. We postulate that periodic hybridization events in this area coupled with pollinator-mediated selection and the potential for microallopatry may have acted together to promote diversification in montane Andean taxa, such as Iochrominae.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Smith SD,Baum DAdoi
10.3732/ajb.93.8.1140subject
Has Abstractpub_date
2006-08-01 00:00:00pages
1140-53issue
8eissn
0002-9122issn
1537-2197pii
93/8/1140journal_volume
93pub_type
杂志文章abstract：:To determine the effects of density, genotype, and their interaction on individual seed mass in Raphanus sativus L., we replicated maternal and paternal families of seed across two planting densities in an experimental garden. Seeds were produced by a nested breeding design performed in the greenhouse. Among garden-ra...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/j.1537-2197.1992.tb13715.x
更新日期：1992-10-01 00:00:00
abstract：:Parsimony, likelihood, and Bayesian analyses of nuclear ITS and plastid trnL-F DNA sequence data are presented for the giant genus Croton (Euphorbiaceae s.s.) and related taxa. Sampling comprises 88 taxa, including 78 of the estimated 1223 species and 29 of the 40 sections previously recognized of Croton. It also incl...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.92.9.1520
更新日期：2005-09-01 00:00:00
abstract：PREMISE OF THE STUDY:A knowledge of pollen characters in early-diverging angiosperm lineages is essential for understanding pollen evolution and the role of pollen in angiosperm diversification. In this paper, we report and synthesize data on mature pollen and pollen ontogeny from all genera of Nymphaeales within a com...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1500249
更新日期：2015-10-01 00:00:00
abstract：:Sex ratio and sexual dimorphism in physiology and growth were studied in the dioecious tree Ilex aquifolium at two localities in northern Spain. Genet sex ratio was significantly male biased in one locality but not in the other. However, ramet and flowering ramet sex ratios were male biased at both study sites. Males ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1998-11-01 00:00:00
abstract：PREMISE OF THE STUDY:Reintroductions may be essential to prevent extinction of many critically endangered species. Ideally, reintroduction efforts rely on adjacent source populations, but limited source material may necessitate crossing individuals from different and possibly distant populations. To determine the conse...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1400271
更新日期：2014-11-01 00:00:00
abstract：PREMISE OF THE STUDY:Nutrient resorption is essential for plant nutrient conservation. Large-bodied plants potentially have large nutrient sink pools and high nutrient flux. Whether and how nutrient resorption can be regulated by plant size and biomass allocation are yet unknown. METHODS:Using the herbaceous plant Ama...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1246
更新日期：2019-03-01 00:00:00
abstract：:The recent consensus that Amborellaceae, Nymphaeales, and Austrobaileyales form the three earliest-diverging lineages of angiosperms has led comparative biologists to reconsider the origin and early developmental evolution of the angiosperm seven-celled/eight-nucleate (Polygonum-type) female gametophyte. Illicium mexi...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.91.3.332
更新日期：2004-03-01 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：UNLABELLED:• PREMISE OF THE STUDY:Mountainous regions support high plant productivity, diversity, and endemism, yet are highly vulnerable to climate change. Historical records and model predictions show increasing temperatures across high elevation regions including the Southern Rocky Mountains, which can have a stron...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1500156
更新日期：2015-08-01 00:00:00
abstract：:The response of axillary buds to floral stimulus activity in stem pieces was examined in two near-isogenic cultivars of tobacco that differ in the recessive maryland mammoth (mm) allele, which confers short-day behavior. All axillary buds from day-neutral plants assayed on six-internode stem pieces made few nodes (les...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1997-07-01 00:00:00
abstract：PREMISE OF THE STUDY:The life histories of lichen fungi are not well known and cannot be readily studied in laboratory culture. This work documents in situ the complete life cycle of the widespread crustose lichen Calopadia puiggarii, which reproduces sexually and asexually on the surfaces of leaves. METHODS:Plastic c...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1400272
更新日期：2014-11-01 00:00:00
abstract：PREMISE OF THE STUDY:Microsatellite primers were developed in the traditional Tibetan medicinal plant Halenia elliptica D. Don to investigate its genetic diversity and population genetic structure. METHODS AND RESULTS:Using the Fast Isolation by AFLP of Sequences Containing (FIASCO) repeats protocol, 24 primer sets we...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000534
更新日期：2011-07-01 00:00:00
abstract：UNLABELLED: PREMISE OF THE STUDY:Verbenaceae consist of trees, shrubs, lianas, and herbs distributed primarily in Latin America, where they occur in a wide array of ecosystems. A second center of diversity exists in Africa. Competing morphology-based classifications that rely on different traits conflict in significan...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000144
更新日期：2010-10-01 00:00:00
abstract：:Perennial crops represent important fresh and processed food sources worldwide, but advancements in breeding perennials are often impeded due to their very nature. The perennial crops we rely on most for food take several years to reach production maturity and require large spaces to grow, which make breeding new cult...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1400143
更新日期：2014-10-01 00:00:00
abstract：PREMISE OF THE STUDY:New microsatellite primers were developed for testing genetic differentiation within Nothoceros aenigmaticus and their potential use in other Nothoceros species. The microsatellites are designed to investigate partitioning of genetic variation in a taxon with a peculiar sex allopatry in the souther...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100392
更新日期：2012-03-01 00:00:00
abstract：:Many plant species contain populations with more than one polyploid cytotype, but little is known of the mechanisms maintaining several cytotypes in a population. Andropogon gerardii cytotypes were compared to evaluate different models of autopolyploid cytotype coexistence. The enneaploid (90 chromosome, 9x) cytotype ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-07-01 00:00:00
abstract：:In plants, polyploidy has been a significant evolutionary force on both recent and ancient time scales. In 1950, Ownbey reported two newly formed Tragopogon allopolyploids in the northwestern United States. We have made the first synthetic lines of T. mirus and T. miscellus using T. dubius, T. porrifolius, and T. prat...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0800299
更新日期：2009-05-01 00:00:00
abstract：PREMISE OF THE STUDY:The presence or absence of a functional copy of a plastid gene may reflect relaxed selection, and may be phylogenetically significant, reflecting shared ancestry. In some liverworts, the plastid gene cysA is a pseudogene (inferred to be nonfunctional). We surveyed 63 liverworts from all major clade...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100010
更新日期：2011-08-01 00:00:00
abstract：:Zeuxine gracilis, Zeuxine strateumatica, and Eulophia sinensis are wild orchids with different breeding systems and colonizing abilities. Zeuxine gracilis is an outcrosser with restricted distribution, whereas S. strateumatica is an apomictic colonizer found only in newly available open habitats. Eulophia sinensis is ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-12-01 00:00:00
abstract：PREMISE:Understanding plant hydraulic functioning and water balance during drought has become key in predicting species survival and recovery. However, there are few insightful studies that couple physiological and morphological attributes for many ecosystems, such as the vulnerable Tropical Montane Cloud Forests (TMCF...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1356
更新日期：2019-10-01 00:00:00
abstract：PREMISE OF THE STUDY:Climate cycles of the Quaternary have impacted plants at a global scale, leaving behind a complex genetic legacy. Species of the northern Rocky Mountains of North America were exposed to more uniform glacial patterns than the central and southern ranges, where synergistic relationships between temp...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1259
更新日期：2019-03-01 00:00:00
abstract：:Deciphering species relationships and hybrid origins in polyploid agamic species complexes is notoriously difficult. In this study of cheilanthoid ferns, we demonstrate increased resolving power for clarifying the origins of polyploid lineages by integrating evidence from a diverse selection of biosystematic methods. ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900019
更新日期：2009-09-01 00:00:00
abstract：:The interaction between simulated cotyledon herbivory and interspecific competition was studied in a greenhouse experiment using two species of trees, Acer rubrum and Quercus palustris, which commonly invade abandoned agricultural fields. Herbivory treatments were applied as a gradient of cotyledon removal for A. rubr...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-12-01 00:00:00
abstract：PREMISE OF THE STUDY:Areas lacking dominant plants, or gaps, can support high diversity and specialist species. Previous chronosequence research in Florida rosemary scrub showed indistinct gap area patterns with fire and the dependence of certain species on gaps. We hypothesized that fire and gap size would affect exti...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1700175
更新日期：2017-12-01 00:00:00
abstract：:Seed size and germination requirements of eight (of nine) Sarracenia species, and 13 populations of S. purpurea were studied. All species except for S. purpurea are restricted to the southeastern United States, whereas S. purpurea ranges across Canada, southward along the eastern United States into Maryland and Virgin...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-03-01 00:00:00
abstract：:We examined the effect of inbreeding on fitness (through both male and female functions) and changes in self-fertility in the partially self-incompatible species Campanula rapunculoides. Individuals in natural populations of C. rapunculoides varied extensively in their strength of self-incompatibility (SI). We crossed...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.90.12.1736
更新日期：2003-12-01 00:00:00
abstract：:Gas exchange was measured in two subalpine herbs during alternating periods of sun and shade that simulated natural cloud patterns. Stomatal conductance (g) in the subalpine herb Helianthella quinquenervis was reduced by as much as 75% during 5-min shade periods that ranged in photosynthetic photon flux density (PPFD)...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/j.1537-2197.1990.tb13548.x
更新日期：1990-02-01 00:00:00
abstract：PREMISE OF THE STUDY:Giant cacti species possess long cylindrical stems that store massive amounts of water and other resources to draw on for photosynthesis, growth, and reproduction during hot and dry conditions. Across all giant cacti taxa, stem photosynthetic surface area to volume ratio (S:V) varies by several fol...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1166
更新日期：2018-10-01 00:00:00
abstract：:Chloroplast DNA (cpDNA) is maternally inherited in the majority, but not all, of angiosperm species. The mode of inheritance of cpDNA is a critical determinant of its molecular evolution and of its population genetic structure. Here, we present the results of investigations of the inheritance of cpDNA in Silene vulgar...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.94.8.1333
更新日期：2007-08-01 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
