Abstract：
:Responses to photoperiod and temperature were compared for hybrids between Asiatic plants in the indigenous strumarium morphological complex and plants in five American complexes: oviforme, italicum, chinense, cavanillesii, and pennsylvancium. The F1 hybrids between Hong Kong plants and various American plants showed intermediacy in photoperiodic response; however, the hybrid night requirement was more similar to that of the American parent. The Hong Kong plants are difficult to evaluate photoperiodically but showed a night length requirement of 9.25-9.50 hr. Day-neutral plants from India in the strumarium complex produced day-neutral F1 hybrids in crosses with most American plants having night requirements less than 10 hr. The F1 hybrids involving the day-neutral Indian plants and either Indian or Australian chinense plants showed a night requirement of 8.25-8.75 hr. The chinense parental plants had apparent critical nights of 10.25-10.50 hr. Crosses between the day-neutral Indian plants and Mexican plants with apparent critical nights of 10.75-11 hr produced F1 hybrids requiring nights of 8.75-9.00 hr. The various hybrids tended to show the broader temperature tolerances of the American parents. The ripeness-to-flower (maturity) responses of seedlings tended to show the genetic controls of the parent with the faster developmental rate. The hybridization evidence suggests that photoperiodic responses are quantitatively controlled and inherited independently of morphology and ripeness-to-flower responses. The populations of India are highly diverse and probably reflect recombinations of photoperiodic and temperature responses between indigenous day-neutral plants and photoperiodic chinense plants introduced from North America.
journal_name
Am J Botjournal_title
American journal of botanyauthors
McMillan Cdoi
10.1002/j.1537-2197.1975.tb12336.xsubject
Has Abstractpub_date
1975-01-01 00:00:00pages
41-47issue
1eissn
0002-9122issn
1537-2197journal_volume
62pub_type
杂志文章abstract：:We developed an improved cytological protocol for producing high quality, light microscope images of plant meiotic chromosomes. Because the technique works on species with small genomes and thick microsporocyte cell walls, it should be useful for studying the wild relatives of Arabidopsis and other eudicots with small...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.94.12.2063
更新日期：2007-12-01 00:00:00
abstract：:Pinus rzedowskii is an endangered pine species from Michoacán (central México), which has been previously reported from only three localities. Classified within the subgenus Strobus, it exhibits intermediate morphological characters between subgenera Strobus and Pinus. We analyzed genetic aspects that could shed light...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-05-01 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:Documented fossil floras in the neotropics are sparse, yet their records provide evidence on the spatial and temporal occurrence of taxa, allowing for testing of biogeographical and diversification scenarios on individual lineages. A new fossil Piper from the Late Cretaceous of Colombia is describe...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1400427
更新日期：2015-02-01 00:00:00
abstract：:Natural recruitment of oaks appears to be declining throughout the northern hemisphere. Summer drought poses a potentially important barrier to oak recruitment in southern California. To evaluate this barrier, we grew evergreen Quercus agrifolia and deciduous Q. lobata from seeds near parental trees. We measured water...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0800247
更新日期：2009-04-01 00:00:00
abstract：:Sphenobaiera huangii (Sze) Hsü is typical Early Mesozoic fossil foliage of Ginkgoales in China. It has been recorded from the Upper Triassic to the Lower Jurassic. The cuticular anatomy is investigated based on material from the type locality, Lower Jurassic Hsiangchi Formation, Zigui County, Hubei Province. The speci...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.92.4.709
更新日期：2005-04-01 00:00:00
abstract：:The origin of polyploid Bromus species of section Genea was investigated using molecular data. This group of annual species native from the Old-World is composed of three diploids, two tetraploids, one hexaploid, and one octoploid. Molecular cloning, sequencing, and phylogenetic analyses were performed on several acce...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.95.4.454
更新日期：2008-04-01 00:00:00
abstract：:Patterns of biodiversity are ultimately the product of speciation and extinction. Speciation serves as the biodiversity pump while extinction serves as the agent that culls global to local levels of biodiversity. Linking these central processes to global and local patterns of biodiversity is a key challenge in both ec...
journal_title：American journal of botany
pub_type： 杂志文章,评审
doi：10.3732/ajb.1000289
更新日期：2011-03-01 00:00:00
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：: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：:Based on positive results for 11 of 17 species included in an anatomical survey of tree roots, we concluded that the origin of adventitious branch roots (ABR) on established, undisturbed woody parental root axes is a widespread occurrence. ABR were morphologically indistinguishable from branch roots formed in primary ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.92.5.802
更新日期：2005-05-01 00:00:00
abstract：PREMISE:Most plants interact with mycorrhizal fungi and animal pollinators simultaneously. Yet, whether mycorrhizae affect traits important to pollination remains poorly understood and may depend on the match between host and fungal genotypes. Here, we examined how ericoid mycorrhizal fungi affected flowering phenology...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1372
更新日期：2019-11-01 00:00:00
abstract：:We propose a new method, the leaf measuring-interval index (LMI), to estimate leaf age in morphological and physiological studies of leaves. When the plastochron, the interval between the initiation of successive leaves, is constant, the well-known leaf plastochron index (LPI) provides a robust measure of leaf age. Wh...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0800303
更新日期：2009-07-01 00:00:00
abstract：UNLABELLED: PREMISE OF THE STUDY:A mixture of outcrossing and selfing is often observed in plant populations. Although mixed mating is ubiquitous, it has several potential evolutionary explanations. Mixed mating may be actively maintained by selection, passively determined by the pollination environment, or a transiti...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000032
更新日期：2010-06-01 00:00:00
abstract：:The fossil record of aquatic flowering plants broadens our understanding of their former diversity and origins from terrestrial ancestors. This paper describes a floating aquatic monocot from 71 whole plants and several isolated leaf fragments from Upper Cretaceous oxbow lake sediments in the Dinosaur Park Formation, ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.94.4.609
更新日期：2007-04-01 00:00:00
abstract：:The circumscription and relationships of genera within the tribe Melanthieae (29 representative taxa) were evaluated using parsimony analyses of ITS (nuclear ribosomal) and trnL-F (plastid) DNA sequence data, alone and in combination. Proposed new generic circumscriptions, strongly supported by the tree statistics and...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-09-01 00:00:00
abstract：PREMISE OF THE STUDY:Functional trait plasticity in resource capture traits has been suggested as an underlying mechanism promoting invasive species establishment and spread. Earlier studies on this mechanism treat invasiveness as a discrete characteristic (i.e., invasive vs. noninvasive) and do not consider the potent...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1600235
更新日期：2016-12-01 00:00:00
abstract：:To our knowledge, xylary reaction tissue has never been reported in a forage crop species. Here we report the discovery of reaction tissue in a transgenic line of Medicago sativa (pC3H, for the gene for p-coumarate-3-hydroxylase) with reduced lignin content and in the wild-type (WT) line. Based on microscopy and biome...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.94.6.912
更新日期：2007-06-01 00:00:00
abstract：:Seedling establishment has long been believed to be rare on alpine tundra because of predicted life history trade-offs, the clonality of alpine species, and the harshness of the alpine climate. Contrary to the idea that seedlings are rare on alpine tundra, a 4-yr demographic study of seedlings at Niwot Ridge, Colorado...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.90.8.1197
更新日期：2003-08-01 00:00:00
abstract：:Floral characteristics such as morphology and flower color have been interpreted as adaptive traits that evolved through selective pressures generated by pollinators. Differences among populations in the expression of floral characters could result from natural selection for their adaptive value to local conditions. W...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.90.3.377
更新日期：2003-03-01 00:00:00
abstract：:A spatially explicit, reiterative algorithm (SERA) is presented and used to predict multiple aspects of plant population and community dynamics. Using simple physical principles and empirically derived relationships, SERA provides an analytical venue to test alternative hypotheses about individual functional traits go...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900063
更新日期：2009-08-01 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：:Soybean partial-female-sterile mutant 1 (PS-1) was recovered from a gene-tagging study. The objectives were to study the inheritance, linkage, allelism, and certain aspects of the reproductive biology of the PS-1 mutant. For inheritance and linkage tests, PS-1 was crossed to flower color mutant Harosoy-w4 and to chlor...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1997-06-01 00:00:00
abstract：:Multiply sired fruits provide unambiguous evidence that pollen from two or more donors was deposited on a stigma and successfully fertilized ovules. Such multiple paternity within fruits can have important consequences for both parental and offspring fitness, but little is known about the frequency of multiple paterni...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.92.5.885
更新日期：2005-05-01 00:00:00
abstract：:Lxm1-O, a dominant EMS (ethyl methanesulfonate) induced mutation in maize (Zea mays, Poaceae), was originally reported to affect the blade/sheath boundary over the midrib region of the leaf. Here we present a more extensive analysis of the Lxm phenotype in nine different inbred lines. Lxm leaves are longer and narrowe...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1998-04-01 00:00:00
abstract：:In an age of rapid global change, it is imperative that we continue to improve our understanding of factors that govern genetic differentiation in plants to inform biologically reasonable predictions for the future and enlighten conservation and restoration practices. In this special issue, we have assembled a set of ...
journal_title：American journal of botany
pub_type：
doi：10.3732/ajb.1500515
更新日期：2016-01-01 00:00:00
abstract：:The evolutionary origins of the morphological and taxonomic diversity of angiosperms is poorly known. We used the genus Melianthus to explore the diversification of the southern African flora. Melianthus comprises eight species, and a phylogeny based on one nuclear and two plastid genes, as well as a morphological dat...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.93.7.1052
更新日期：2006-07-01 00:00:00
abstract：PREMISE OF STUDY:Although there is increasing recognition of the effects of plant intraspecific diversity on consumers, the mechanisms by which such effects cascade-up to higher trophic levels remain elusive. METHODS:We evaluated the effects of plant (lima bean, Phaseolus lunatus) intraspecific diversity on a suite of...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1600234
更新日期：2016-10-01 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：:The degree to which plants self-fertilize may impact their potential for genetic adaptation. Given that the mating system influences genetic processes within and among populations, the mating system could limit or promote local adaptation. I conducted a literature survey of published reciprocal transplant experiments ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900224
更新日期：2010-02-01 00:00:00
