Topic
Polygonum
About: Polygonum is a research topic. Over the lifetime, 1230 publications have been published within this topic receiving 12765 citations.
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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 dormancy found in fresh nuts of Polygonum convolvulus L., which persists in nuts stored dry in the laboratory, and their germination has been studied, and mechanisms of the dormancy and dormancy-breaking are discussed.
Abstract: Summary
The dormancy found in fresh nuts of Polygonum convolvulus L., which persists in nuts stored dry in the laboratory, and their germination has been studied. Methods of breaking this dormancy by means of low temperature treatment and by the use of gibberellic acid, thiourea, uracil, thymine, adenine, guanine and cytosine are described. A method of recording germination ability which weights the rapid germination necessary for the establishment of this species in nature has been used. Mechanisms of the dormancy and dormancy-breaking are discussed.
16 citations
TL;DR: Results showed that dichloromethane extracts was the most active with MICs between 31.2 – 1000 μg/mL, validating the ethnopharmacological use of P. persicaria to treat affections related with fungal infections in the Argentinean traditional medicine.
Abstract: Polygonum L. genus (Polygonaceae) is represented in Argentina by 21 species and some of them have been used in the traditional medicine of our country to treat affections related with fungal infections, such as skin ailments and vaginal diseases. With the aim of contributing to the correct ethnopharmacological use of this genus, in the present work we describe the antifungal properties of P. persicaria (species not studied up to now) and the bio-guided isolation of the main active compounds. Results showed that dichloromethane extracts was the most active with MICs (Minimun Inhibitory Concentrations) between 31.2 - 1000 microg/mL, validating the ethnopharmacological use of P. persicaria to treat affections related with fungal infections in the Argentinean traditional medicine.
15 citations
01 Jan 2013
TL;DR: In this paper, the contents of N, P, K, Ca, Mg, Na, Fe, Cu, Mn and Zn in winter wheat, spring barley, sugar beets and winter rape, as well as in the most common weed species infesting these crops.
Abstract: We have determined the contents of N, P, K, Ca, Mg, Na, Fe, Cu, Mn and Zn in winter wheat, spring barley, sugar beets and winter rape, as well as in the most common weed species infesting these crops. It was established that the percentage of mineral components in the dry matter of the majority of weeds is higher than in that of the cultivated plants. The most dangerous weed species competing with plants for the investigated nutrients were: Chenopodium album, Cirsium arvense, Convolvulus arvensis, Polygonum convolvulus, Sonchus arvensis and Stellaria media .
15 citations
TL;DR: Results showed that among the five species of Persicaria section studied, two species contained sesquiterpenes 1–4 but not flavonoids 5–7, other two species contain flavonoid 5-7 but not sesQuiterpene 1– 4, and only one species contained compounds 1–7.
Abstract: Leaves of five species of Polygonum genus belonging to Persicaria section were collected from the northeast and central lowlands of Argentina and their dichloromethane extracts were analyzed by GC/EM. They were investigated for the presence of four drimane-type sesquiterpenes: polygodial (1), isopolygodial (2), drimenol (3) and confertifolin (4), previously isolated from P. acuminatum; and the presence of three flavonoids: pinostrobin (5), flavokawin B (6) and cardamonin (7), previously isolated from P. persicaria. Results showed that among the five species of Persicaria section studied, two species contained sesquiterpenes 1–4 but not flavonoids 5–7, other two species contained flavonoids 5–7 but not sesquiterpenes 1–4, and only one species contained compounds 1–7. These results add evidences to a previous proposal to sub-classify the Persicaria section of Polygonum genus from a chemotaxonomic point of view. [Editor's note: This paper's References are notated within the main body of the text in ...
15 citations