A plant subclass of the class Liliopsida (monocotyledons) in the Chronquist classification system. This is equivalent to the Alismatales order in the APG classification system. It is a primitive group of more or less aquatic plants.

Posidonia oceanica meadow: a low nutrient high chlorophyll (LNHC) system? (1/38)

BACKGROUND: In spite of very low nutrient concentrations in its vicinity - both column and pore waters-, the Posidonia oceanica of the Revellata Bay displays high biomass and productivity. We measured the nutrient fluxes from the sediment into the water enclosed among the leaf shoots ("canopy water") to determine if it is possible source of nutrients for P. oceanica leaves. RESULTS: During the summer, the canopy water appears to act as a nutrient reservoir for the plant. During that period, the canopy water layer displays both a temperature 0.5 degrees C cooler than the upper water column, and a much higher nutrient content, as shown in this work using a very simple original technique permitting to sample water with a minimal disturbance of the water column's vertical structure. Despite low nutrient concentrations in pore water, mean net fluxes were measured from the sediment to the canopy water. These fluxes are sufficient to provide 20% of the mean daily nitrogen and phosphorus requirement of the P. oceanica shoots. CONCLUSION: An internal cycling of nutrients from P. oceanica senescent leaves was previously noted as an efficient strategy to help face low nutrient availability. The present study points out a second strategy which consists in holding back, in the canopy, the nutrients released at the water-sediment interface. This process occurs when long leaves, during poor nutrient periods in the water column, providing, to P. oceanica, the possibility to develop, high biomass, high chlorophyll quantities in low nutrient environment (a Low Nutrients High Chlorophyll system).  (+info)

Occurrence of sulfated galactans in marine angiosperms: evolutionary implications. (2/38)

We report for the first time that marine angiosperms (seagrasses) possess sulfated polysaccharides, which are absent in terrestrial and freshwater plants. The structure of the sulfated polysaccharide from the seagrass Ruppia maritima was determined. It is a sulfated D-galactan composed of the following regular tetrasaccharide repeating unit: [3-beta-D-Gal-2(OSO3)-1-->4-alpha-D-Gal-1-->4-alpha-D-Gal-1-->3-beta-D-Gal-4(OSO3 )-1-->]. Sulfated galactans have been described previously in red algae and in marine invertebrates (ascidians and sea urchins). The sulfated galactan from the marine angiosperm has an intermediate structure when compared with the polysaccharides from these two other groups of organisms. Like marine invertebrate galactan, it expresses a regular repeating unit with a homogenous sulfation pattern. However, seagrass galactan contains the D-enantiomer of galactose instead of the L-isomer found in marine invertebrates. Like red algae, the marine angiosperm polysaccharide contains both alpha and beta units of D-galactose; however, these units are not distributed in an alternating order, as in algal galactan. Sulfated galactan is localized in the plant cell walls, mostly in rhizomes and roots, indicative of a relationship with the absorption of nutrients and of a possible structural function. The occurrence of sulfated galactans in marine organisms may be the result of physiological adaptations, which are not correlated with phylogenetic proximity. We suggest that convergent adaptation, due to environment pressure, may explain the occurrence of sulfated galactans in many marine organisms.  (+info)

Assessing genetic diversity in clonal organisms: low diversity or low resolution? Combining power and cost efficiency in selecting markers. (3/38)

The increasing use of molecular tools to study populations of clonal organisms leads us to question whether the low polymorphism found in many studies reflects limited genetic diversity in populations or the limitations of the markers used. Here we used microsatellite datasets for two sea grass species to provide a combinatory statistic, combined with a likelihood approach to estimate the probability of identical multilocus genotypes (MLGs) to be shared by distinct individuals, in order to ascertain the efficiency of the markers used and to optimize cost-efficiently the choice of markers to use for deriving unbiased estimates of genetic diversity. These results strongly indicate that conclusions from studies on clonal organisms derived using markers showing low polymorphism, including microsatellites, should be reassessed using appropriate polymorphic markers.  (+info)

An accurate fluorescent assay for quantifying the extent of RNA editing. (4/38)

Recent data suggest that small differences in editing efficiency can have significant functional consequences. Here we present a fluorescent poisoned primer extension assay that is capable of distinguishing editing efficiency differences as low as 5%. For a poison-primer extension assay to be accurate, the extension product must stop at the intended base. Sometimes, however, it runs beyond. We tested the effect of specific enzyme-terminator combinations on the amount of run through. In the worst cases it accounted for 70% of the total signal, and in the best cases <5%. In addition, the specific base can affect run through, with G producing the least. The accuracy of the assay was demonstrated on templates derived from mixed plasmids and then verified on two biological substrates. Using either a K(+) channel mRNA that contains a site for adenosine deamination or an ndhB mRNA that contains a site for cytidine deamination, the editing efficiency predicted by the assay closely matched that predicted by bulk sequencing of individual cDNA clones. This assay should prove useful for analyzing small changes in editing efficiency or for quantifying single nucleotide polymorphisms.  (+info)

Trace metal concentrations in Posidonia oceanica of North Corsica (northwestern Mediterranean Sea): use as a biological monitor? (5/38)

BACKGROUND: Within semi-closed areas like the Mediterranean Sea, anthropic wastes tend to concentrate in the environment. Metals, in particular, are known to persist in the environment and can affect human health due to accumulation in the food chain. The seagrass Posidonia oceanica, widely found in Mediterranean coastal waters, has been chosen as a "sentinel" to quantify the distribution of such pollutants within the marine environment. Using a technique similar to dendrochronology in trees, it can act as an indicator of pollutant levels over a timeframe of several months to years. In the present study, we measured and compared the levels of eight trace metals (Cr, Ni, Cu, Zn, As, Se, Cd, and Pb) in sheaths dated by lepidochronology and in leaves of shoots sampled from P. oceanica meadows collected from six offshore sites in northern Corsica between 1988 and 2004; in the aim to determine 1) the spatial and 2) temporal variations of these metals in these areas and 3) to compared these two types of tissues. RESULTS: We found low trace metal concentrations with no increase over the last decade, confirming the potential use of Corsican seagrass beds as reference sites for the Mediterranean Sea. Temporal trends of trace metal concentrations in sheaths were not significant for Cr, Ni, Cu, As or Se, but Zn, Cd, and Pb levels decreased, probably due to the reduced anthropic use of these metals. Similar temporal trends between Cu levels in leaves (living tissue) and in sheaths (dead tissue) demonstrated that lepidochronology linked with Cu monitoring is effective for surveying the temporal variability of this metal. CONCLUSION: Leaves of P. oceanica can give an indication of the metal concentration in the environment over a short time period (months) with good accuracy. On the contrary, sheaths, which gave an indication of changes over long time periods (decades), seem to be less sensitive to variations in the metal concentration in the environment. Changes in human consumption of metals (e.g., the reduction of Pb in fuel) are clearly reflected in both organs. These results confirm that P. oceanica is a good bioindicator of metals and a good biomonitor species for assessing Cu in the environment.  (+info)

Flower-like terminal structures in racemose inflorescences: a tool in morphogenetic and evolutionary research. (6/38)

Terminal flower-like structures (TFLS) occur in many angiosperms that possess indeterminate inflorescences such as spikes, racemes, or spadices. We describe and review TFLS in early-divergent angiosperms, especially the magnoliid order Piperales and the monocot order Alismatales, in which floral interpretation is controversial. Essentially similar TFLS occur in a wide range of taxa. Among magnoliids, they occur in some Piperales (Saururaceae and a few Piperaceae), but are absent from Chloranthaceae. Among monocots, they occur in some early-divergent families such as Acoraceae, Aponogetonaceae, Juncaginaceae, Potamogetonaceae, and Ruppiaceae. Similar TFLS with obscure organ identity are recorded in mutants of Arabidopsis. TFLS can often be interpreted as pseudanthia (close aggregations of reduced flowers), but in some cases the entire terminal pseudanthium is very similar to a true flower. In some cases, elaborated TFLS could therefore have given rise to what are normally termed 'true' (i.e. euanthial) flowers. Data presented here on terminal pseudanthia in Potamogeton and Ruppia support a pseudanthial evolutionary origin of reproductive units in the alismatid families Zannichelliaceae and Cymodoceaceae. Furthermore, in some alismatid species, either the entire inflorescence apex or an individual primordium at or near the inflorescence tip can be transformed into a filamentous or tubular (or intermediate) structure. A tubular structure enclosing stamens and carpels is described in Piper. This indicates that pseudanthium formation can provoke morphological novelties, perhaps due to new patterns of overlap between expression zones of regulatory genes and/or new spatial constraints.  (+info)

Spectrum of genetic diversity and networks of clonal organisms. (7/38)

Clonal reproduction characterizes a wide range of species including clonal plants in terrestrial and aquatic ecosystems, and clonal microbes such as bacteria and parasitic protozoa, with a key role in human health and ecosystem processes. Clonal organisms present a particular challenge in population genetics because, in addition to the possible existence of replicates of the same genotype in a given sample, some of the hypotheses and concepts underlying classical population genetics models are irreconcilable with clonality. The genetic structure and diversity of clonal populations were examined using a combination of new tools to analyse microsatellite data in the marine angiosperm Posidonia oceanica. These tools were based on examination of the frequency distribution of the genetic distance among ramets, termed the spectrum of genetic diversity (GDS), and of networks built on the basis of pairwise genetic distances among genets. Clonal growth and outcrossing are apparently dominant processes, whereas selfing and somatic mutations appear to be marginal, and the contribution of immigration seems to play a small role in adding genetic diversity to populations. The properties and topology of networks based on genetic distances showed a 'small-world' topology, characterized by a high degree of connectivity among nodes, and a substantial amount of substructure, revealing organization in subfamilies of closely related individuals. The combination of GDS and network tools proposed here helped in dissecting the influence of various evolutionary processes in shaping the intra-population genetic structure of the clonal organism investigated; these therefore represent promising analytical tools in population genetics.  (+info)

Phenols content and 2-D electrophoresis protein pattern: a promising tool to monitor Posidonia meadows health state. (8/38)

BACKGROUND: The endemic seagrass Posidonia oceanica (L.) Delile colonizes soft bottoms producing highly productive meadows that play a crucial role in coastal ecosystems dynamics. Human activities and natural events are responsible for a widespread meadows regression; to date the identification of "diagnostic" tools to monitor conservation status is a critical issue. In this study the feasibility of a novel tool to evaluate ecological impacts on Posidonia meadows has been tested. Quantification of a putative stress indicator, i.e. phenols content, has been coupled to 2-D electrophoretic protein analysis of rhizome samples. RESULTS: The overall expression pattern from Posidonia rhizome was determined using a preliminary proteomic approach, 437 protein spots were characterized by pI and molecular weight. We found that protein expression differs in samples belonging to sites with high or low phenols: 22 unique protein spots are peculiar of "low phenols" and 27 other spots characterize "high phenols" samples. CONCLUSION: Posidonia showed phenols variations within the meadow, that probably reflect the heterogeneity of environmental pressures. In addition, comparison of the 2-D electrophoresis patterns allowed to highlight qualitative protein expression differences in response to these pressures. These differences may account for changes in metabolic/physiological pathways as adaptation to stress. A combined approach, based on phenols content determination and 2-D electrophoresis protein pattern, seems a promising tool to monitor Posidonia meadows health state.  (+info)

Alismatidae is a subclass of monocotyledonous aquatic and semi-aquatic flowering plants, also known as the water plantains. This group includes several families of plants that are typically found in wetlands, marshes, and along the edges of bodies of water. The plants in this group have adapted to their aquatic environments with specialized structures such as floating leaves and air-filled tissues that help them float on the water's surface. Some examples of plants in Alismatidae include waterlilies, pondweeds, and cattails.

... is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system ... see Alismatidae info). The APG II system does not use formal botanical names above the rank of order; it assigns most of the ... subclass Alismatidae order Alismatales order Hydrocharitales order Najadales order Triuridales This subclass comprises less ... subclass Alismatidae superorder Alismatanae order Butomales order Hydrocharitales order Najadales order Alismatales order ...
Alismatidae 4. Liliidae - 3 superorders Pandananae Dioscoreanae Lilianae - 3 orders Liliales - 12 families Corsiaceae Becc., ...
Alismatidae superorder 1. Butomanae order 1. Butomales family 1. Butomaceae superorder 2. Alismatanae order 1. Alismatales ...
... subclass Alismatidae order Cyclanthales order Arales subclass Commelinidae order Commelinales order Eriocaulales order ... Alismatidae superorder 1. Butomanae superorder 2. Alismatanae subclass 2. Triurididae subclass 3. Aridae superorder 1. Acoranae ... superorder Hydatellanae superorder Juncanae superorder Poanae subclass Arecidae superorder Arecanae subclass Alismatidae ...
1967) Subclass Alismatidae Takht. (1967) Subclass Triurididae Takht. ex Reveal (1992) Subclass Aridae Takht. (1997) As ... 1760) (Monocotyledons) p. 595 Subclass I: Alismatidae p. 589 Superorder Petrosavianae Superorder Alismatanae Superorder Aranae ...
New combinations in North American Alismatidae. Novon 6(4): 370-371 Jepson Manual Treatment Photo gallery v t e (CS1 errors: ...
Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in part), and Zingiberidae. Fl. N. Amer. 22: i-xxiii, 1-352. Hokche, O., PE ...
Alismatidae, Arecidae, Commelinidae (in part), and Zingiberidae. Flora of North America. Vol. 22. Oxford University Press. ISBN ...
Les, Donald H.; Cleland, Maryke A.; Waycott, Michelle (1997). "Phylogenetic Studies in Alismatidae, II: Evolution of Marine ...
Alismatidae, Arecidae, Commelinidae(in Part), and Zingiberidae. Oxford University Press, USA. ISBN 978-0-19-513729-3. "New ...
Flora of North America: North of Mexico Volume 22: Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in Part), and ...
Alismatidae, Arecidae, Commelinidae(in Part), and Zingiberidae. Oxford University Press, USA. p. 186. ISBN 9780195137293. v t e ...
However, Cronquist assumed a much smaller order and assigned the order to subclass Alismatidae, in class Liliopsida [= ...
... was an order of flowering plants that was used in the Cronquist system, in the subclass Alismatidae. It used the ...
Flowering plants Dicotyledons Magnoliidae Hamamelidae Caryophyllidae Dilleniidae Rosidae Asteridae Monocotyledons Alismatidae ...
Thorne, R. F. The classification and geography of the monocotyledon subclasses Alismatidae, Liliidae and Commelinidae, pp. 75- ...
Les, D.H., Cleland, M.A. and Waycott, M. (1997) "Phylogenetic studies in Alismatidae, II: evolution of marine angiosperms ( ...
The Cronquist system of 1981 placed the family in order Najadales of subclass Alismatidae in class Liliopsida [=monocotyledons ...
"Phylogenetic studies in Alismatidae, II: evolution of marine angiosperms (seagrasses) and hydrophily", Systematic Botany, 22 (3 ... Alismatidae)", Aliso, 22: 211-230, doi:10.5642/aliso.20062201.18 Tanaka, Norio; Setoguchi, Hiroaki; Murata, Jin (1997), " ...
22, Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in part), and Zingiberidae. Oxford University Press, New York, NY, USA ...
The Cronquist system (1981) places the Alismatales in subclass Alismatidae, class Liliopsida [= monocotyledons] and includes ... to the Subclass Alismatidae. Araceae in Tahktajan 1997 is assigned to the Arales and placed in the Subclass Aridae; ... only three families as shown: Alismataceae Butomaceae Limnocharitaceae Cronquist's subclass Alismatidae conformed fairly ...
Subclassis Alismatidae Subclassis Liliidae Superordo Lilianae Ordo Liliales Ordo Bromeliales Ordo Iridales Ordo Dioscoreales ...
... which used this name for an order in subclass Alismatidae with this circumscription: order Najadales family Aponogetonaceae ...
... alismatidae MeSH B06.388.100.025.033 - alismataceae MeSH B06.388.100.025.033.044 - alisma MeSH B06.388.100.025.033.777 - ...
A well-known system that used this name is the Cronquist system (1981), for an order in subclass Alismatidae, with this ...
"Phylogenetic studies in Alismatidae, II: Evolution of Marine Angiosperms (Seagrasses) and Hydrophily", Systematic Botany, 22 (3 ...
Class Liliatae (Monocotyledoneae) Subclass Alismatidae (4 orders) Order Alismatales Order Hydrocharitales Order Najadales Order ... Subclass Alismatidae Order Alismatales Butomaceae Limnocharitaceae Alismataceae Order Hydrocharitales Hydrocharitaceae Order ...
Alismatidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system ... see Alismatidae info). The APG II system does not use formal botanical names above the rank of order; it assigns most of the ... subclass Alismatidae order Alismatales order Hydrocharitales order Najadales order Triuridales This subclass comprises less ... subclass Alismatidae superorder Alismatanae order Butomales order Hydrocharitales order Najadales order Alismatales order ...
The New York Flora Atlas is a source of information for the distribution of plants within the state, as well as information on plant habitats, associated ecological communities, and taxonomy. In addition, users can learn about the location of vouchered specimens and see images to get a better visual for each plant.
Members of the group of vascular plants which bear flowers. They are differentiated from GYMNOSPERMS by their production of seeds within a closed chamber (OVARY, PLANT). The Angiosperms division is composed of two classes, the monocotyledons (Liliopsida) and dicotyledons (Magnoliopsida). Angiosperms represent approximately 80% of all known living plants.
Alismatidae. Alismatales. Angiosperms. Magnoliopsida. Beetles. Coleoptera. Cycadophyta. Cycadopsida. Insects. Insecta. ...
Alismatidae. Alismatales. Angiosperms. Magnoliopsida. Beetles. Coleoptera. Cycadophyta. Cycadopsida. Insects. Insecta. ...
In: Die Farn-und Blütenpflanzen Baden-Württembergs - Band 7: Spezieller Teil (Spermatophyta, Unterklassen Alismatidae, Liliidae ... In: Die Farn-und Blütenpflanzen Baden-Württembergs - Band 7: Spezieller Teil (Spermatophyta, Unterklassen Alismatidae, Liliidae ... In: Die Farn-und Blütenpflanzen Baden-Württembergs - Band 7: Spezieller Teil (Spermatophyta, Unterklassen Alismatidae, Liliidae ...
The Valerian plant family of the order Dipsacales, subclass Asteridae, class Magnoliopsida that is characterized by 3-5-lobed tubular flowers, often spurred at the base and clustered in tight heads ...
acalyptratae, accipitrinae, achaemenidae, acoraceae, adoxaceae, agavaceae, alcmaeonidae, alismatidae, amentiferae, amphioxidae ...
1 collections found. 1 collections shown.. ...
This graph shows the total number of publications written about "Calycanthaceae" by people in this website by year, and whether "Calycanthaceae" was a major or minor topic of these publications ...
seagrass, sav, fibreball, weed, plantae, vascular, magnoliophyta, angiosperm, flowering plant, liliopsida, monocot, alismatidae ... seagrass, sav, plantae, vascular, magnoliophyta, angiosperm, flowering plant, liliopsida, monocot, alismatidae, hydrocharitales ...
Alismatidae; Alismatales; قاشق واش سانان; Alismatales; Alismatales; Alismatales; Alismatales; Alismatales; Alismatales; ...
Alismatidae. Alismatales. Angiosperms. Magnoliopsida. Antigen Peptide Transporter-1. ATP-Binding Cassette Sub-Family B Member 2 ...
... On-line free medical diagnosis assistant. Ranked list of possible diseases from either several symptoms or a full patient history. A similarity measure between symptoms and diseases is provided.
Alismatidae Najas Posidonia Ruppia Registry Number. txid16360. Related Numbers. txid13165. txid16365. txid55487. Public MeSH ... Alismatidae Term UI T475040. Date12/27/2001. LexicalTag NON. ThesaurusID NLM (2003). ... A plant genus of the family Ruppiaceae, subclass ALISMATIDAE, class Liliopsida (monocotyledons).. Terms. Ruppia Preferred Term ... A plant genus of the family Najadaceae, subclass ALISMATIDAE, class Liliopsida (monocotyledons).. Terms. Najas Preferred Term ...
Alismatidae Najas Posidonia Ruppia Registry Number. txid16360. Related Numbers. txid13165. txid16365. txid55487. Public MeSH ... Alismatidae Term UI T475040. Date12/27/2001. LexicalTag NON. ThesaurusID NLM (2003). ... A plant genus of the family Ruppiaceae, subclass ALISMATIDAE, class Liliopsida (monocotyledons).. Terms. Ruppia Preferred Term ... A plant genus of the family Najadaceae, subclass ALISMATIDAE, class Liliopsida (monocotyledons).. Terms. Najas Preferred Term ...
Volume 22, Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in part), and Zingiberidae. Oxford Univ. Press, New York, NY. ...
B1.650.940.800.575.100.25.33 Alismatidae B1.650.388.100.25 B1.650.940.800.575.100.25 Allium B1.650.388.100.610.100 B1.650. ...
Alismatidae Alkadienes Alkalies Alkaline Ceramidase Alkaline Phosphatase Alkaloids Alkalosis Alkalosis, Respiratory Alkanes ...
  • It consists of: subclass Alismatidae superorder Alismatanae order Butomales order Hydrocharitales order Najadales order Alismatales order Aponogetonales order Juncaginales order Potamogetonales order Posidoniales order Cymodoceales order Zosterales The Cronquist system treats this as one of four subclasses within the class Liliopsida (=monocotyledons). (wikipedia.org)
  • It consists of (1981): subclass Alismatidae order Alismatales order Hydrocharitales order Najadales order Triuridales This subclass comprises less than five hundred species total: many of these are aquatic or semiaquatic plants (see Alismatidae info). (wikipedia.org)