title: Ent-2'-epi-Orobanchol and its acetate, as germination stimulants for Striga gesnerioides seeds isolated from cowpea and red clover.
abstract: Striga gesnerioides is a root parasitic weed of economic significance to cowpea (Vigna unguiculata) crops in Western Africa. Seeds of the parasite germinate in response to cowpea root exudates. Germination stimulants for the seeds were isolated from the hydroponic culture filtrate of cowpea, and their structures were unambiguously determined as (-)-(3aR,4R,8bR,2'R)-ent-2'-epi-orobanchol and (+)-(3aR,4R,8bR,2'R)-ent-2'-epi-orobanchyl acetate, on the basis of mass, CD, and (1)H NMR spectra; optical rotatory power; and chromatographic behavior on HPLC. The alcohol was first isolated and identified from the cowpea root exudates, and the acetate may be the same compound that had been previously isolated from the exudates and designated as alectrol. Identity of the stimulants produced by cowpea to those produced by red clover (Trifolium pratense) was confirmed.
authors: Graduate School of Agricultural Science,  Kobe University , Rokkodai, Nada, Kobe 657-8501, Japan.
authors: Kotomi
authors: K
authors: Ueno
authors: Saki
authors: S
authors: Nomura
authors: Satoru
authors: S
authors: Muranaka
authors: Masaharu
authors: M
authors: Mizutani
authors: Hirosato
authors: H
authors: Takikawa
authors: Yukihiro
authors: Y
authors: Sugimoto
mesh_terms: D000085:Acetates / Q000378:metabolism / Q000494:pharmacology; D007887:Fabaceae / Q000378:metabolism*; D018525:Germination / Q000187:drug effects*; D007783:Lactones / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D018517:Plant Roots / Q000378:metabolism; D012639:Seeds / Q000254:growth & development*; D034362:Striga; D029921:Trifolium / Q000378:metabolism*
chemical_list: D000085:Acetates; D007783:Lactones; C472678:orobanchol