Abstract
In this review, structural requirements of strigolactones (SLs) for seed germination of root parasitic plants and induction of hyphal branching in arbuscular mycorrhizal (AM) fungi are summarized. In addition, based on these results together with other available data, molecular design of SL analogs for practical application in agriculture is discussed. It appears that chemical modifications of SL may provide new SL analogs that are active seed germination stimulants but inactive in AM hyphal branching and vice-versa. Some of chemically stable SL analogs are promising leads for new plant growth regulators.