Showing papers on "Polygonum published in 1983"

Effects of stilbene components of roots of Polygonum ssp. on liver injury in peroxidized oil-fed rats.

Abstract: The effects of POLYGONUM CUSPIDATUM S IEB. et Z UCC. (“Kojo-kon” or “Itadori-kon” in Japanese) of POLYGONUM MULTIFLORUM (“Kashuwu” or “Tsurudo-kudami-kon” in Japanese) roots and their stilbene components (piceid and 2,3,5,4′-tetrahydroxy stilbene-2-O-D-glucoside) on liver injury caused in rats by feeding peroxidized oil were investigated. Piceid and 2,3,5,4′-tetrahydroxy stilbene-2-O-D-glucoside were found to partly inhibit the deposition of lipid peroxides in the liver of those rats. The stilbene glucosides reduced the elevation of GOT and GPT levels in the serum of the rats. Furthermore, resveratrol, piceid and 2,3,5,4′-tetrahydroxy stilbene-2-O-D-glucoside were found to inhibit lipid peroxidation induced by ADP and NADPH in rat liver microsomes.

Plasticity and genotypic variation in photosynthetic behaviour of an early and a late successional species of Polygonum

Abstract: Rates of photosynthesis were measured in each of six replicated genotypes for each of two Polygonum species at five light and seven temperature levels. The early successional species, Polygonum pensylvanicum L., exhibited higher rates of photosynthesis and a more sun-tolerant behavior compared to its later successional relative, Polygonum virginianum L., results that are consistent with previously observed successional trends. Quantitative comparisons of individual genotype plasticity and between-genotype variation indicate that, in general, plasticity contributes more to population flexibility in photosynthetic response of these species than does between-genotype variation. However, the relative contribution of between-genotype variation was found to vary depending on the environmental variable and species studied. Between-genotype variation assumed greater importance in the temperature response than in the light response. Similarly between-genotype variation was more important in P. virginianum than in P. pensylvanicum supporting the notion that later successional species are less plastic. These results establish that significant levels of photosynthetic variation occur even within populations.

THE BIOLOGY OF CANADIAN WEEDS. 60. Polygonum convolvulus L.

Abstract: Polygonum convolvulus L., wild buckwheat (Polygonaceae), is a common weed occurring throughout much of Canada. It is of European origin and has been associated with human agricultural activities since before recorded history. On the Canadian prairies, it is one of the most abundant weeds in crops, and can cause significant crop losses.Key words: Polygonum convolvulus, wild buckwheat

Food containing stilbene compound extracted from specific polygonum plant as principal component

Abstract: PURPOSE: To provide the titled food containing a stilbene compound extracted from a specific polygonum plant and effective to promote the hepatic function. CONSTITUTION: The rhizome, root, etc. of a Polygonum plant selected from ITADORI (Polygonum cuspidatum), TSURUMI-DOKUDAMI (Polygonum multiflorum), OOKETADE (Polygonum orientale) and MIZUHIKI (Polygonum filiforme) is dried, pulverized, and extracted with acetone-methanol. The obtained soluble fraction is extracted with ethyl ether, and the fraction hardly soluble in ethyl ether is purified by silica gel column chromatography, and recrystallized with ethanol to obtain the stilbene compound of formula composed of resveratrol (R 1 and R 2 are H), biseide (R 1 is D-glucose; R 2 is H) and 2,3,5,4'-tetrahydroxystilbene-2-O-D-glucoside (R 1 is H; R 2 is O-D-glucose). The stilbene compound is formed to an arbitrary food to enable the administration of 100W800mg of the compound daily. COPYRIGHT: (C)1985,JPO&Japio