Abstract：
:Recent surveys of seed coat morphology in Lobelioideae (Campanulaceae) have demonstrated the systematic utility of such data in the subfamily and led to a revision of the supraspecific classification of Lobelia. Expanding upon these studies, we examined via scanning electron microscopy 41 seed accessions, emphasizing lobelioid genera in which only one or no species had been examined. Most conformed to previously described testal patterns. However, five species of the endemic Hawaiian genus Cyanea, comprising the molecularly defined Hardyi Clade, had a unique testal pattern (here termed Type F), characterized by laterally compressed, almost linear, areoles with rounded, knob-like protuberances on the radial walls at opposite ends. This offered a convenient synapomorphy for recognition of a clade originally defined on a molecular basis. A second unique testal pattern was found in the related Hawaiian endemics Brighamia and Delissea, thus supporting their close relationship. In this type (here termed Type G), the seed coat is irregularly wrinkled (rugose), creating broad, rounded ridges that run more-or-less perpendicular to the long axis of the seed and thus to the long axis of the testal cells. Seed coat morphology also supported the monophyly of all 124 species of Hawaiian Lobelioideae and their probable derivation from Asian species of Lobelia subg. Tupa. Additional studies supported close relationships between (1) the neotropical genera Centropogon and Siphocampylus; (2) the western American genera Legenere and Downingia; and (3) Jamaican Hippobroma and Lobelia sect. Tylomium, a group endemic to the West Indies.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Buss CC,Lammers TG,Wise RRsubject
Has Abstractpub_date
2001-07-01 00:00:00pages
1301-8issue
7eissn
0002-9122issn
1537-2197pii
88/7/1301journal_volume
88pub_type
杂志文章abstract：:Recruitment and mortality of Spartina alterniflora tillers and culms were estimated from measurements of live standing crops at Wallops Island, Virginia. Stands of tall and medium form grass produced from 452 to 1,227 tillers m-2 yr-1 . Those tillered in spring lengthened into culms their first year, while those tille...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/j.1537-2197.1983.tb12430.x
更新日期：1983-01-01 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：:This paper presents the first broad overview of three main features of microsporogenesis (male meiosis) in angiosperms: cytokinesis (cell division), intersporal wall formation, and tetrad form. A phylogenetic comparative approach was used to test for correlated evolution among these characters and to make hypotheses a...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0800110
更新日期：2008-11-01 00:00:00
abstract：PREMISE OF THE STUDY:Tea Unigene-derived MicroSatellite (TUGMS) markers were identified from the publicly available EST data in Camellia sinensis for characterization and future genome mapping studies in tea. METHODS AND RESULTS:One hundred twelve novel TUGMS markers were identified from 4356 unigenes derived by clust...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000525
更新日期：2011-06-01 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：:The taxonomic richness of seed plants at different taxonomic levels was compared between temperate East Asia and North America at both continental and semi-continental scales. In each comparison, land area and latitude range were adjusted to a comparable level between the two continental regions. East Asia is signific...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.11.1818
更新日期：2002-11-01 00:00:00
abstract：:Cladistic parsimony analyses of rbcL nucleotide sequence data from 171 taxa representing nearly all tribes and subtribes of Orchidaceae are presented here. These analyses divide the family into five primary monophyletic clades: apostasioid, cypripedioid, vanilloid, orchidoid, and epidendroid orchids, arranged in that ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-02-01 00:00:00
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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
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journal_title：American journal of botany
pub_type： 评论,杂志文章
doi：10.3732/ajb.1100036
更新日期：2011-04-01 00:00:00
abstract：:The phenotype of maize plants that are homozygous recessive for the nuclear gene iojap is commonly an "anemic," grainy green appearance accompanied by white leaf stripes, white leaf margins, and reduced growth. In plants in which the iojap effect is occurring (homozygous ij/ij), we find affected tissue varies in exten...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/j.1537-2197.1988.tb13486.x
更新日期：1988-05-01 00:00:00
abstract：:Molecular phylogenetic studies of seven plastid DNA regions were used to resolve circumscriptions at generic and infrageneric levels in subfamily Tillandsioideae of Bromeliaceae. One hundred and ten tillandsioid samples were analyzed, encompassing 10 genera, 104 species, and two cultivars. Two species of Bromelioideae...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.92.2.337
更新日期：2005-02-01 00:00:00
abstract：PREMISE:Adaptation to harsh edaphic substrates has repeatedly led to the evolution of edaphic specialists and generalists. Yet, it is unclear what factors promote specialization versus generalization. Here, we search for habitat use patterns associated with serpentine endemics (specialists) and serpentine tolerators (g...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1285
更新日期：2019-05-01 00:00:00
abstract：PREMISE OF THE STUDY:Mixotrophy is a strategy whereby plants acquire carbon both through photosynthesis and heterotrophic exploitation of mycorrhizal fungi. In Euro-American Pyroleae species studied hitherto, heterotrophy levels vary according to species, sites of study, and possibly light conditions. We investigated m...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100546
更新日期：2012-07-01 00:00:00
abstract：:The cacti are well-known desert plants, widely recognized by their specialized growth form and essentially leafless condition. Pereskia, a group of 17 species with regular leaf development and function, is generally viewed as representing the "ancestral cactus," although its placement within Cactaceae has remained unc...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.92.7.1177
更新日期：2005-07-01 00:00:00
abstract：PREMISE:Despite the efforts to understand the processes that shape neotropical biodiversity, the complexity of certain biomes, such as the Atlantic Forest (AF), prevents the generalization of patterns. Initially, ecological niche modeling (ENM), with phylogeographic studies, identified past stable areas in the central ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1317
更新日期：2019-07-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.93.5.770
更新日期：2006-05-01 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：: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
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journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-05-01 00:00:00
abstract：:We sequenced the nuclear small subunit ribosomal DNA coding region from 20 members of the Bangiophycidae and from two members of the Florideophycidae to gain insights into red algal evolution. A combined alignment of nuclear and plastid small subunit rDNA and a data set of Rubisco protein sequences were also studied t...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-08-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-11-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-08-01 00:00:00
abstract：:The pitchers of the tropical carnivorous plant Nepenthes alata are highly specialized organs for the attraction and capture of insects and absorption of nutrients from them. This study examined the structure and development of these pitchers, with particular focus on the nectaries and digestive glands. Immature pitche...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-10-01 00:00:00
abstract：PREMISE OF THE STUDY:Phenological mismatch has received attention in plant-pollinator interactions, but less so in seed dispersal mutualisms. We investigated whether the seasonal availability of myrmecochorous seeds is well matched to the seasonal activity patterns of seed-dispersing ants. METHODS:We compared seasonal...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1214
更新日期：2019-01-01 00:00:00
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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:Most pollen walls are interrupted by apertures, thin areas providing access to stigmatic fluids and exit points for pollen tubes. Unexpectedly, pollen tubes of Arabidopsis thaliana are not obligated to pass through apertures and can instead take the shortest route into the stigma, passing directly ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1600031
更新日期：2016-06-01 00:00:00
abstract：:Biparental inbreeding is thought to be a common feature of plant populations with restricted pollen dispersal. It is generally assumed that the inbreeding depression frequently observed to accompany self-fertilization can be extrapolated to the lesser degrees of consanguinity involved in biparental inbreeding, but thi...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/j.1537-2197.1993.tb13838.x
更新日期：1993-05-01 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：PREMISE OF THE STUDY:Herbivory affects pollination success and reproductive output in plants. However, the different stages in the process from pollination to seed maturation have hardly been investigated within the context of herbivory. Herbivory might affect these stages via its effect on geitonogamous pollination an...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1500291
更新日期：2015-12-01 00:00:00
abstract：PREMISE OF THE STUDY:Permineralization provides the most faithful known mode of three-dimensional preservation of the morphology and cellular anatomy of fossil plants. Standard optical microscopic documentation of such structures can provide only an approximation of their true three-dimensional form and is incapable of...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1300027
更新日期：2013-08-01 00:00:00
