Showing papers on "Polygonum published in 1978"
TL;DR: In this article, the seeds of 82 species of weed and crop plants were tested for germinability after dry storage or storage in fresh water for 3 to 60 months, and only 22% of the annual monocots tested germinated.
Abstract: Seeds of 82 species of weed and crop plants were tested for germinability after dry storage or storage in fresh water for 3 to 60 months. Seeds of 24 species did not germinate after storage in water for 12 months or less; whereas some seeds of 27 species germinated after 60 months in water storage. When stored in water for longer than 12 months some seeds of only 22% of the annual monocots tested germinated; whereas about 75% of the perennial monocots, and annual and perennial dicots germinated. Species whose seeds consistently germinated better after water storage than after dry storage were western waterhemlock [Cicuta douglasii (DC.) Coult. & Rose], woolly sedge (Carex lanuginosa Michx.), pale smartweed (Polygonum lapathifolium L.), bouncingbet (Saponaria officinalis L.), and blue vervain (Verbena hastata L.).
53 citations
30 citations
Journal Article•
TL;DR: Great toxic effect appeared in the light than in the dark and more during the period ranging from the pre-monsoon to pou-mon summer than during the winter, and much of the inhibitory factor (s) was eliminated from the solution.
Abstract: Aqueous extract of leaves of Polygonum orientate L. retarded the germination of test species more than extracts of stem, root and flower of the same plant. In all cases, P. orientale leaf extract adversely affected the seedling growth of mustard and the inhibition was discernible more on the bypocotyl than on the root. Increasing the amount of leaf tissues augmented the inhibitory action and washing removed much of the activity, Phytotoxicity was conspicuous in the extract rather than in the leachate, with the five-day soaked leachate being more potent than ihe three-day one. Successive extractions of the same leaf material showed that the first extract contained most of the active principle (s). Very mature leaves seemed to produce more inhibitor (s) than young and mature leaves. Activity was higher when the bioassay was conducted at 20 or 30 C than at 25 C. Greater toxic effect appeared in the light than in the dark and more during the period ranging from the pre-monsoon to pou-monsoon than during the winter. Extract of dried foliage was less inhibitory than that of fresh foliage, but ash from dry leaves lacked activity. Treatment of aqueous solution of leaves with Norit eliminated much of the inhibitory factor (s) from the solution. The repressing power of the leaf extract was not lost after autoclaving or even after inoculation with a soil micro-organism. The compounds isolated, having inhibitory properties, were possibly luteolin and apigenin glycosides.
4 citations
Journal Article•
TL;DR: Records from the central part of the Netherlands of adventitious species on their way to or already arrived at the status of naturalization are published.
Abstract: Records from the central part of the Netherlands of adventitious species on their way to or already arrived at the status of naturalization: Amsinckia menziesii (Lehm.) Nels. & Macbr., Egeria densa Planch., Eragrostis capillaris (L.) Nees, Polygonum cilinode Michx., Solanum nitidibaccatum Bitter, and Sorghum halepense (L.) Pers.
1 citations