Ambrosia artemisiifolia L. (common ragweed) is an invasive plant whose allelopathic properties have been suggested by its field behaviour and demonstrated through phytotoxicity bioassays. However, the nature of the molecules responsible for the allelopathic activity of common ragweed has not been...

Plant chemical defenses can be qualitative (toxins) to face generalist herbivores and quantitative (digestibility reducers) to specialists. Trichomes can produce chemicals, but also acts as a quantitative defense and in water loss. The shifting defense hypothesis (SDH) poses that invasive plants...

Root exudates of sunflower (Helianthus annuus L.) line 2607A induced germination of seeds of root parasitic weeds Striga hermonthica, Orobanche cumana, Orobanche minor, Orobanche crenata, and Phelipanche aegyptiaca. Bioassay-guided purification led to the isolation of a germination stimulant...

The genus Tithonia is an important source of diverse natural products, particularly sesquiterpene lactones, diterpenes, and flavonoids. The collected information in this review attempts to summarize the recent developments in the ethnobotany, biological activities, and secondary metabolite...

The allelopathic effects of different parts of the plant Xanthium italicum Moretti were evaluated by conducting bioassays against two dicot plants, amaranth (Amaranthus mangostanus L.) and lettuce (Lectuca sativa L.), and two monocot plants, wheat (Triticum aestivum Linn) and ryegrass (Lolium...

The author have been studied the Artemisia annua invasive species. This donor plant contain a sesquiterpene-lactone (artemisinin) compound. The A. annua extracts in our experiment was strong growth inhibitor against Echinochloa weed species. Already 10 ml/m² quantity was effective in glasshouse...

The annual invasive weed Parthenium (Parthenium hysterophorus L.) was introduced during the last 50 years to Australia, Africa, and India. Parthenium spreads out on farm- and barren land and causes significant losses in crop yields. In addition, it is a health hazard for humans and livestock due to ...

Parthenium is an exotic invasive weed that originated in tropical America, but now occurs widely in India, Australia, and Africa. In Ethiopia, it is growing in different ecological zones, covering altitudes between 900 and 2500 m above sea level. We analyzed secondary metabolites in Parthenium...

Surface compounds were obtained by a methylene chloride extract of fresh flower heads of wild plants of Chrysanthemum coronarium L. in Chile. Three fractions were obtained by column chromatography and analyzed by GC-MS leading to the identification of several monoterpenes and sesquiterpene...

The extract containing sesquiterpene lactones of Centaurea iberica (Asteraceae) was isolated and a steroidal compound, which is stigmast-1,5-dien-3β-ol, was purified. The chemical structure was established based on spectroscopic data (UV, IR, MS, ¹H NMR, ¹³C NMR). Both the extract and the compound...