Orobanchyl acetate, a natural strigolactone, is a germination stimulant for root parasitic plants[1].
References
[1] Xiaonan Xie, et al. Isolation and identification of alectrol as (+)-orobanchyl acetate, a germination stimulant for root parasitic plants. Phytochemistry. 2008 Jan;69(2):427-31. DOI:10.1016/j.phytochem.2007.07.017