title: Toxicity and influences of the alkaloids from Cynanchum komarovii AL. Iljinski (Asclepiadaceae) on growth and cuticle components of Spodoptera litura Fabricius (Noctuidae) larvae.
abstract: The acute lethal toxicity of the extracted and purified gross alkaloids from Cynanchum komarovii has been demonstrated on the insect pest, Spodoptera litura. The toxic regression equation of the gross alkaloids for S. litura larvae was Y = -2.69701 + 0.78711X and the LC(50) value 2669.88 mg L(-1). The growth disruptions of S. litura caused by the alkaloids from C. komarovii were also evaluated. The rates of growth inhibition, malformation, developmental duration (from third instar to pupation), pupation and emergence inhibition of S. litura caused by the gross alkaloids at dose rates between 50 and 800 mg L(-1) were 30.13-91.71%, 0.00-20.00%, 12-72 h, 16.66-36.66% and 16.66-50.00%, respectively. The alkaloids caused the modification of the cuticular components of S. litura. The relative contents of cuticular lipids, proteins and chitins showed a 3.02-17.11% rise before exposure, followed by 2.29-12.96% and 0.75-4.13% declines 72 h after treatment with gross alkaloids with concentrations between 50 and 800 mg L(-1). Initial studies on the insecticidal properties of C. komarovii gross alkaloids indicate these to be very potent insect growth inhibitors.
authors.affiliation: Key Laboratory for Biological Control of Ministry of Agriculture, China Agricultural University, 100193, Beijing, China.
authors.forename: Hongli
authors.initials: H
authors.lastname: Sun
authors.forename: Simon
authors.initials: S
authors.lastname: Blanford
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Guo
authors.forename: Xuejiao
authors.initials: X
authors.lastname: Fu
authors.forename: Wangpeng
authors.initials: W
authors.lastname: Shi
mesh_terms: D000470:Alkaloids / Q000633:toxicity*; D000818:Animals; D031105:Cynanchum / Q000737:chemistry*; D007814:Larva / Q000187:drug effects*; D018411:Spodoptera / Q000737:chemistry / Q000254:growth & development*
chemical_list: D000470:Alkaloids