Abstract
Strigolactones (SLs) are a class of terpenoid lactones initially identified as seed germination stimulants for root parasitic plants more than 50 years ago. Long after this initial discovery, SLs were re-characterized as the symbiotic signals for arbuscular mycorrhizal fungi that supply inorganic nutrients, such as phosphate, to their host plants. In 2008, SLs were found to be endogenous plant hormones that regulate shoot branching in plants. The discovery of SLs as a new class of plant hormones has significantly advanced research in this field. Studies over the past 15 years have elucidated almost the entire pathway of SL biosynthesis and the overall mechanism of its signaling. This review summarizes research on the SL biosynthetic pathway, and the current state of knowledge of the SL perception mechanism.
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