Abstract：
:Expansion of Typha domingensis into areas previously dominated by Cladium jamaicense in the Florida Everglades has been linked to anthropogenic phosphorus (P) enrichment and increased hydroperiod. The principal stress factor for plants in flooded soils is biochemical reduction, the intensity of which is measured as redox potential (Eh). The objective of this study was to assess the growth response of C. jamaicense to Eh (-150, +150, and +600 mV) and P availability (10, 80, and 500 μg P/L). Plants were grown hydroponically in a factorial experiment using titanium (Ti(3+)) citrate as an Eh buffer. Treatment effects on growth, biomass partitioning, and tissue nutrients were recorded. Growth approximately doubled in response to a 50-fold increase in P availability. Low redox significantly reduced growth and tissue P concentration. While plant P concentrations increased 20-fold between the 10 and 500 μg P/L treatments, P concentrations were 50-100% higher at +600 mV than at -150 mV within each phosphate level. At high Eh, C. jamaicense appears well adapted to low nutrient environments because of its low P requirement and high retention of acquired P. However, at low Eh the ability to acquire or conserve acquired P decreases and as a consequence, higher phosphate levels are required to sustain growth. Findings of this study indicate that young C. jamaicense exhibits low tolerance to strongly reducing conditions when phosphate is scarce.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Lissner J,Mendelssohn IA,Lorenzen B,Brix H,McKee KL,Miao Sdoi
10.3732/ajb.90.5.736subject
Has Abstractpub_date
2003-05-01 00:00:00pages
736-48issue
5eissn
0002-9122issn
1537-2197pii
90/5/736journal_volume
90pub_type
杂志文章abstract：:Floral organogenesis and development of the tropical legume trees Haematoxylum campechianum (logwood) and H. brasiletto (brazilwood) were studied using scanning electron microscopy. The aims were to compare ontogenies, and to elucidate the relationships of Haematoxylum with other genera of Caesalpinieae, the basal tri...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1997-08-01 00:00:00
abstract：:In the southern Appalachian mountains a subcanopy species, Rhododendron maximum, inhibits the establishment and survival of canopy tree seedlings. One of the mechanisms by which seedlings could be inhibited is an allelopathic effect of decomposing litter or leachate from the canopy of R. maximum (R.m.) on seed germina...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-11-01 00:00:00
abstract：:Axillary meristems play a fundamental role in inflorescence architecture. Maize (Zea mays) inflorescences are highly branched panicles because of the production of multiple types of axillary meristems. We used auxin transport inhibitors to show that auxin transport is required for axillary meristem initiation in the m...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.94.11.1745
更新日期：2007-11-01 00:00:00
abstract：:Chromosome numbers and karyotypes of species of Orobanche, Cistanche, and Diphelypaea (Orobanchaceae) were investigated, and 108 chromosome counts of 53 taxa, 19 counted for the first time, are presented with a thorough compilation of previously published data. Additionally, karyotypes of representatives of these gene...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.91.3.439
更新日期：2004-03-01 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:Pollinator shifts have been implicated as a driver of divergence in angiosperms. We tested the hypothesis that there was a transition from bird- to butterfly pollination in the African genus Clivia (Amaryllidaceae) and investigated how floral traits may have been either modified or retained during ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1300363
更新日期：2014-01-01 00:00:00
abstract：:Taxonomical classification of higher fungi remains an important challenge and can benefit from the application of molecular analysis. We propose that the ectomycorrhizal (EM) fungal taxa might include a number of cryptic species because there are few morphological characteristics useful for distinguishing among these ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.94.10.1630
更新日期：2007-10-01 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：:In volume 97(2) of the American Journal of Botany (pp. 268-275), we published an article entitled "Structural, physiological, and stable carbon isotopic evidence that the enigmatic Paleozoic fossil Prototaxites formed from rolled liverwort mats". Here, we respond to a letter and a commentary on our article in the pres...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000172
更新日期：2010-07-01 00:00:00
abstract：PREMISE OF STUDY:Sequence analyses for Pinaceae have suggested that extant genera diverged in the late Mesozoic. While the fossil record indicates that Pinaceae was highly diverse during the Cretaceous, there are few records of living genera. This description of an anatomically preserved seed cone extends the fossil re...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100568
更新日期：2012-06-01 00:00:00
abstract：:In Nicotiana attenuata, systemic induction of heat-shock proteins (Hsps) was detected in response to the treatment of single leaves by either heat shock, mechanical damage, or exogenous application of methyl jasmonate (MJ). All treatments increased the abundance of members of the 70-kD Hsp (Hsp70) family and induced s...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-05-01 00:00:00
abstract：:Despite their ecological significance, parasitic plants face more conservation challenges than do autotrophic plants. This is especially true for the groups that include weedy or invasive species such as Cuscuta. While approximately half of the Cuscuta (dodders) species may require conservation measures, the genus as ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0800425
更新日期：2009-09-01 00:00:00
abstract：:We examined the function of floral traits associated with buzz pollination through studies of Rhexia virginica (Melastomataceae) in the Muskoka region of Ontario, Canada. Controlled pollinations demonstrated that the species is self-compatible, but dependent on insects for pollen transfer. Bumble bees made 82 and 90% ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-04-01 00:00:00
abstract：:Interspecific hybridization is considered a possible mechanism of plant diversification. The Andes are a hotspot of biodiversity, but hybridization in Andean taxa has so far not been investigated intensively. The current study investigates crossability in Caiophora (Loasaceae subfam. Loasoideae) by experimental inters...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.2007403
更新日期：2008-09-01 00:00:00
abstract：PREMISE OF THE STUDY:Palaeotropic Derris-like taxa (family Fabaceae, tribe Millettieae) comprise 6-9 genera. They are well known as important sources of rotenone toxin, which are used as organic insecticide and fish poison. However, their phylogenetic relationships and classification are still problematic due to insuff...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1200390
更新日期：2012-11-01 00:00:00
abstract：:Tropical forest plants are known to be pollinated by a diverse array of animals. Here we report on the pollination of a woody climber species, Uvaria elmeri (Annonaceae), by cockroaches in a lowland mixed-dipterocarp forest in Sarawak, Malaysia. To the best of our knowledge, this is the first report of pollination by ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1997-02-01 00:00:00
abstract：:Phylogenetic relationships of eight species of Saintpaulia H. Wendl., 19 species of Streptocarpus Lindl. (representing all major growth forms within the genus), and two outgroups (Haberlea rhodopensis Friv., Chirita spadiciformis W. T. Wang) were examined using comparative nucleotide sequences from the two internal tr...
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:Generic boundaries and infrageneric relationships among the charismatic temperate magnoliid Asarum sensu lato (Aristolochiaceae) have long been uncertain. Previous molecular phylogenetic analyses used either plastid or nuclear loci alone and varied greatly in their taxonomic implications for the ge...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1400316
更新日期：2015-05-01 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：:Gaura (Onagraceae: Onagreae) is a small North American genus of 21 species consisting mostly of night-blooming, moth-pollinated annuals and perennials. The current infrageneric classification based on differences in habit, floral symmetry, and fruit morphology recognizes eight sections within the genus. We examine the...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.91.1.139
更新日期：2004-01-01 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：PREMISE OF THE STUDY:The perennial feather moss Hylocomium splendens is one of the most widely distributed and common bryophytes in the Northern Hemisphere and has, because of its capacity to grow under a wide range of environmental conditions, been used as a biomonitor for atmospheric metal deposition in Europe. METH...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1200028
更新日期：2012-09-01 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：:Primarily known only by the edible fruits of Citrus, Rutaceae comprise a large (c. 160 genera and 1900 species), morphologically diverse, cosmopolitan family. Of its extraordinary array of secondary chemical compounds, many have medicinal, antimicrobial, insecticidal, or herbicidal properties. To assist with the much-...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.2007313
更新日期：2008-08-01 00:00:00
abstract：:Breadfruit (Artocarpus altilis, Moraceae), a traditional starch crop in Oceania, has enjoyed legendary status ever since its role in the infamous mutiny aboard the H.M.S. Bounty in 1789, yet its origins remain unclear. Breadfruit's closest relatives are A. camansi and A. mariannensis. DNA fingerprinting data (AFLP, am...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.91.5.760
更新日期：2004-05-01 00:00:00
abstract：:The mode of chloroplast DNA (cpDNA) inheritance was investigated in the genus Larrea (Zygophyllaceae) by polymerase chain reaction (PCR) amplification of cpDNA fragments using three pairs of chloroplast universal primers. A total of 20 F(1)s from interspecific crosses among five different taxa in the section Bifolium ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-10-01 00:00:00
abstract：:Self-incompatibility (SI) is an effective method for limiting self-fertilization in flowering plant species, but there are circumstances in which an otherwise functional SI system may fail. One of the most intriguing of these is the induction of selfing by mixed loads of self and heterospecific pollen (the mentor effe...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1998-06-01 00:00:00
abstract：:The FAD2-1 microsomal omega-6 desaturase gene contains a large intron ( approximately 1133 bp [base pairs]) in the 5' untranslated region that may participate in gene regulation and, in GOSSYPIUM:, is evolving at an evolutionary rate useful for elucidating recently diverged lineages. FAD2-1 is single copy in diploid G...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-01-01 00:00:00
abstract：:Woody stems comprise a large biological carbon fraction and determine water transport between roots and leaves; their structure and function can influence both carbon and hydrological cycles. While angiosperm wood anatomy and density determine hydraulic conductivity and mechanical strength, little is known about inter...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900178
更新日期：2010-02-01 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
