Showing papers on "Polygonum published in 2001"
TL;DR: Findings indicate that hydroxyanthraquinones such as emodin are phytoestrogens with an affinity to human estrogen receptors, and show that the unchelated hydroxyl group is essential for strong activity.
161 citations
TL;DR: The dichloromethane extract of the aerial parts of this plant showed strong activity in a bioautographic assay with the fungus Cladosporium sphaerospermum and the bioassay-guided chemical fractionation afforded the sesquiterpene dialdehyde polygodial as the active constituent.
Abstract: Polygonum punctatum (Polygonaceae) is an herb known in some regions of Brazil as "erva-de-bicho" and is used to treat intestinal disorders. The dichloromethane extract of the aerial parts of this plant showed strong activity in a bioautographic assay with the fungus Cladosporium sphaerospermum. The bioassay-guided chemical fractionation of this extract afforded the sesquiterpene dialdehyde polygodial as the active constituent. The presence of this compound with antibiotic, anti-inflammatory and anti-hyperalgesic properties in "erva-de-bicho" may account for the effects attributed by folk medicine to this plant species.
62 citations
TL;DR: The study demonstrated that seed bank strategies of invasive species are qualitatively similar to their less abundant native congeners, but there were significant quantitative differences.
Abstract: The goal of this study was to determine whether seed longevity is an indicator of invasive potential. We studied annual (Polygonum) and woody perennial (Celastrus, Parthenocissus) non-native species and their native con- geners in a three-year buried seed experiment. The woody perennial species formed a transient seed bank lasting only one year. In year one, both perennial non-native species had significantly greater germination than their native con- geners. Both Polygonum species formed a persistent seed bank, but the invasive P. perfoliatum had greater longevity than the native P. sagittatum. The study demonstrated that seed bank strategies of invasive species are qualitatively similar to their less abundant native congeners, but there were significant quantitative differences.
49 citations
TL;DR: Four new phenylpropanoid esters of sucrose, lapathosides A, B, C, and D, isolated from the aerial parts of Polygonum lapathifolium together with known esters, vanicoside B and hydropiperoside, showed significant inhibitory effects on the Epstein-Barr virus early antigen activation by tumor-promoters.
Abstract: Four new phenylpropanoid esters of sucrose, lapathosides A (1), B (2), C (3), and D (4), were isolated from the aerial parts of Polygonum lapathifolium together with known esters, vanicoside B (5) and hydropiperoside (6). The structures of 1-4 were determined by spectral (1D and 2D NMR and MS) analysis. Lapathoside A (1) and vanicoside B (2) showed significant inhibitory effects on the Epstein-Barr virus early antigen activation by tumor-promoters.
40 citations
TL;DR: From Polygonum hydropiper L., a C13-norisoprenoid glucoside was isolated and its absolute configuration was established to be (6S,9S)-roseoside by spectroscopic evidence and X-ray crystallographic analysis of its acetate derivative.
Abstract: From Polygonum hydropiper L., a C13-norisoprenoid glucoside was isolated and its absolute configuration was established to be (6S,9S)-roseoside (1) by spectroscopic evidence and X-ray crystallographic analysis of its acetate derivative (2). In addition, the stereostructure of roseoside from Canthium subcordatum was revised to the (6S,9S) configuration.
31 citations
TL;DR: Investigating whether within‐species differences in morphological and reproductive traits are associated with differences in host species exploitation found leaf toughness varied among species in a way suggesting that leaf toughness may be partly responsible for host related differences in G. nymphaeae.
Abstract: The water lily beetle Galerucella nymphaeae L. (Coleoptera: Chrysomelidae) exploits different hosts, including Nuphar lutea Sm. and Nymphaea alba L. (both Nymphaeaceae), as well as Polygonum amphibium L. and Rumex hydrolapathum Hudson (both Polygonaceae). The present study investigates whether within-species differences in morphological and reproductive traits are associated with differences in host species exploitation. A total of 1103 adult beetles were collected from 11 localities in The Netherlands, one of which contained all four hosts and three other localities contained hosts from both families (sympatric localities). Adults originating from Nuphar and Nymphaea were on average darker in colour and larger in size and had disproportionally bigger mandibles than beetles originating from Polygonum and Rumex across the 11 localities. Head capsules of first instar larvae from Nymphaeaceae hosts were between 17% and 28% larger than those of larvae from Polygonaceae hosts. Furthermore, beetles from Nuphar and Nymphaea laid larger sized eggs, but fewer eggs per clutch than beetles originating from Polygonum and Rumex. Although host related variation was less pronounced at the sympatric localities than in the allopatric localities, differences in larval and adult size were still highly significant at the sympatric localities. It is not clear whether the observed differences are genetically based, as opposed to host induced, However, leaf toughness varied among species in a way suggesting that leaf toughness may be partly responsible for host related differences in G. nymphaeae.
17 citations
TL;DR: In this article, a sesquiterpene acid named viscozulenic acid (VSA) was obtained from methanol extract of Polygonum viscosum, the structure of which was unambiguously elucidated by UV, HR-EIMS and a series of 1D and 2D NMR experiments.
Abstract: High-performance liquid chromatographic analysis of a methanol extract of Polygonum viscosum has yielded a novel sesquiterpene acid, 6-hydroxy-4-methoxycarbonyl-7-(1-methylethyl)-3,3a,6,7,8,8a-hexahydroazulene-1-carboxylic acid (named viscozulenic acid) [1], the structure of which was unambiguously elucidated by UV, HR-EIMS, and a series of 1D and 2D NMR experiments.
16 citations
TL;DR: A broad range of surface sculptures in some species and their similarity across taxonomically distant taxa decrease the value of the characters for taxa identification.
Abstract: Based on SEM examination of 47 specimens and 33 species from Russia and Europe, this is a survey of achene surface ultrasculpture in 6 subsections of annual species of Polygonum. Early and late achenes detected in most species possess sound distinctions in achene shape, size, color and exocarp structure. Late achenes with early and fast seed germination preserve exocarp structure typical for premature achenes of both types: thin colorless walls and vast cavities, thin cuticle and insignificant wax deposits. Early achenes destined for long-term preservation in soil are thickwalled and covered with thick and smooth cuticles and wax layers. The structure of achene surfaces changes substantially during maturing, especially in early achenes: coarse or foveo-rugulate background becomes minutely rough, foveosmooth or minutely reticulate. Verrucae are not obligatory ornaments. Depending on their location and arrangement of exocarp cells the surface is evenly verrucate (subsect. Paatula Tzvel.), linear-verrucate (subsect. Salsuginea Tzvel.) or striate-verrucate (subsect. Humifusa Tzvel., most species in subsect. Polygonum). Smooth and glossy achenes are more common in permanently wet environments (subsect. Maritima Tzvel., Arenaria Tzvel., P. arenastrum and P. calcatum from subsect. Polygonum). In places with fluctuating availability of water the achenes have heavier sculpturing and thicker cutin and wax coverings. A broad range of surface sculptures in some species and their similarity across taxonomically distant taxa decrease the value of the characters for taxa identification.
16 citations
TL;DR: The leaf blade structure in transversal section, veins, stoma and epidermal trichome were compared and the genera Polygonum, Ruprechtia and Triplaris are easily distinguishable through their anatomical features: stomatal types, glandular trichomes, surface and edge non-glandulartrichome, fimbria vein andEpidermal idioblasts.
Abstract: Leaf anatomy of Polygonaceae (Angiospermae) from the upper Parana river floodplain. Leaf anatomy of the following Polygonaceae Polygonum acuminatum, P. ferrugineum, P. hydropiperoides, P. meisnerianum, P. punctatum, P. stelligerum, Ruprechtia laxiflora and Triplaris americana was carried out as an aid towards the identification of these species found in the upper Parana river floodplain. The leaf blade structure in transversal section, veins, stoma and epidermal trichome were compared. The genera Polygonum, Ruprechtia and Triplaris are easily distinguishable through their anatomical features: stomatal types, glandular trichomes, surface and edge non-glandular trichome, fimbria vein and epidermal idioblasts. Polygonum species are distinguishable through non- glandular trichomes, epidermal cavity and, with some difficulty, through areolas and veinlets.
9 citations
TL;DR: The Polygonum hydropiper community has strong growth potential because it has a source of biodiversity in its reservoir of germinable seeds of different species in the soil, and species diversity and dominance vary with vegetation stage.
Abstract: The seed-bank and the dynamics of a Polygonum hydropiper L. community were investigated. The study area is located along the Po river in the Central-West Po plane (Northern Italy), in Piedmont, near Alessandria. The seed-bank in the soil was investigated by means of a simplified procedure of seasonal sampling and germination tests while the dynamics of the Polygonum community was investigated within a permanent square. Results indicate that: i) The Polygonum hydropiper community has strong growth potential because it has a source of biodiversity in its reservoir of germinable seeds of different species. River overflows act both as disturbance and as vectors for propagules, selecting the species that can grow and develop within the vegetation, and the species that will be left as seeds in the soil; ii) species diversity and dominance vary with vegetation stage (seed bank, pioneer stages and mature stages); iii) two types of seed-bank were present in the soil we analysed: a transient one and a pers...
7 citations
Journal Article•
TL;DR: Six single-locus, polymorphic microsatellite markers in a perennial herbaceous plant, Polygonum cuspidatum, were developed and tests to amplify these six loci in another Polygonal species failed, suggesting that the six markers are specific to P. c Suspidatum.
Abstract: Six single-locus, polymorphic microsatellite markers in a perennial herbaceous plant, Polygonum cuspidatum, were developed. Tests to amplify these six loci in another Polygonum species failed, suggesting that the six markers are specific to P. cuspidatum.
30 Jun 2001
Patent•
21 Mar 2001
TL;DR: In this article, a hair growth composition is obtained by including one or more kinds selected from a stilbene-based compound represented by the formula (A and B are each a halogen, amino or the like; n and m are each an integer of 0-5), its polymer and plant extracts containing the same.
Abstract: PROBLEM TO BE SOLVED: To obtain a hair growth composition having prophylactic effects on alopecia and hair growth effects by including a stilbene-based compound abundantly contained in a plant of the family Polygonaceae or Vitaceae or Veratrum album as an essential ingredient. SOLUTION: This hair growth composition is obtained by including one or more kinds selected from a stilbene-based compound represented by the formula (A and B are each a halogen, amino or the like; n and m are each an integer of 0-5), its polymer and plant extracts containing the same. For example, the compound represented by the formula is resveratrol, polydatin or α-viniferin and can be synthesized by the Wittig reaction of the corresponding phosphonium salt with the corresponding aldehyde. A dried material, an extract, etc., prepared by carrying out a treatment such as drying, extraction or purification from a suitable site of a rhizome, a fruit, etc., of the plant containing the compound represented by the formula (e.g. Polygonum multiflorum which is a plant of the family Polygonaceae, Vistis vinifra species of the family Vitaceae or Veratrum album) may be used. The stilbene-based compound is preferably contained in an amount of 0.0001-5 wt.% in the composition.
Journal Article•
Journal Article•
Patent•
04 Dec 2001
TL;DR: In this article, a dermal external agent is obtained by blending the following components A to C simultaneously: (1) an extract of plants belonging to the Polygonum L. of 1 kind or >= 2 kinds selected from Polygonm cuspidatum Sieb. et Zucc, (2) a extract of Helianthus annuus L. and (3) a combination of plants from the genus Lupinus L.
Abstract: PROBLEM TO BE SOLVED: To provide a dermal external agent having a high skin-beutifying activity, stable and not having problems in its safety such as skin-irritating property and skin sensitivity. SOLUTION: This dermal external agent is obtained by blending the following components A to C simultaneously. Component A: An extract of plants belonging to the Polygonum L. of 1 kind or >=2 kinds selected from Polygonum cuspidatum Sieb. et Zucc., Polygonum cuspidatum Sieb. et Zucc. Var. hachidyoense Ohwi and Polygonum sachalinense Fr. Schm. Component B: An extract of 1 kind or >=2 kinds selected from plants belonging to the genus Lupinus L. Component C: An extract of Helianthus annuus L.
Journal Article•
TL;DR: Persilben (3,5methoxy-2-hydroxy-E-stilbene) was satisfactorily separated on thin layers of silica gel, by use of two-step gradient elution, and quantified by densitometric techniques.
Abstract: Persilben (3,5-methoxy-2-hydroxy-E-stilbene) was satisfactorily separated on thin layers of silica gel, by use of two-step gradient elution, and quantified by densitometric techniques. The results were evaluated statistically. Eight acetone extracts from herbs and rhizomes of six taxons of Polygonum L. genus: P. lapathifolium ssp nodosum (Pers.) Dans., P. lapathifolium ssp. tomentosum (Schrank) Dans., P. hydropiper L., P. bistorta L., P. amphibium L., P. convolvulus L. (Bilderdykia convolvulus L.) were studied. Persilben was detected in the herbs of five taxons of Polygonum L. The amounts of the compound ranged between 46.3 and 174.2 pg g -1 dry herbs.
Journal Article•
TL;DR: Study indicates that Mastura (1700m) can be an ideal site for the cultivation of Polygonum species without any major change in their biochemical attributes, especially within Tungnath and Mastura.
Abstract: Some biochemical attributes in three Polygonum species viz. P. amplexicaule, P. macrophyllum and P. rumicifolium were analyzed during acclimatization at three different altitudes in Garhwal Himalaya. In general, all the species did not show much difference along with altitudinal changes, especially within Tungnath (3600m) and Mastura (1700m), although some minor changes were observed which might be due to altitudinal adaptation ofthese species. Except P. amplexicaule, the plants ofother two species got deteriorated during four to six months acclimation at Srinagar (550m), probably due to marked changes in climatic conditions. Study indicates that Mastura (1700m) can be an ideal site for the cultivation ofthese species without any major change in their biochemical attributes.
01 Jan 2001
TL;DR: Polygonum lanigerum R.Br.
Abstract: Polygonum lanigerum R.Br. is given varietal status as Persicaria lapathifolia (L.) S.F. Gray var. lanigera (R.Br.) Chantar. & P. Tubtimtong. The taxon is newly recorded for Thailand and is described and illustrated.