Ent-2′-epi-Orobanchol and Its Acetate, As Germination Stimulants for Striga gesnerioides Seeds Isolated from Cowpea and Red Clover

Striga gesnerioides is a root parasitic weed of economic significance to cowpea crops in Western Africa

Kotomi Ueno; Saki Nomura; Satoru Muranaka; Masaharu Mizutani; Hirosato Takikawa; Yukihiro Sugimoto

2011

Scholarcy highlights

  • Striga gesnerioides is a root parasitic weed of economic significance to cowpea crops in Western Africa
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  • 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 1H 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 was confirmed

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