Abstract
Main conclusionThe key step in the mode of action of strigolactones is the enzymatic detachment of the D-ring. The thus formed hydroxy butenolide induces conformational changes of the receptor pocket which trigger a cascade of reactions in the signal transduction.Strigolactones (SLs) constitute a new class of plant hormones which are of increasing importance in plant science. For the last 60 years, they have been known as germination stimulants for parasitic plants. Recently, several new bio-properties of SLs have been discovered such as the branching factor for arbuscular mycorrhizal fungi, regulation of plant architecture (inhibition of bud outgrowth and of shoot branching) and the response to abiotic factors, etc. To broaden horizons and encourage new ideas for identifying and synthesising new and structurally simple SLs, this review is focused on molecular aspects of this new class of plant hormones. Special attention has been given to structural features, the mode of action of these phytohormones in various biological actions, the design of SL analogs and their applications.
Highlights
Strigolactones (SLs) constitute a new class of plant hormones which are of increasing importance in plant science
To broaden horizons and encourage new ideas for identifying and synthesising new and structurally simple SLs, this review is focused on molecular aspects of this new class of plant hormones
Assuming that the mode of action for bud outgrowth inhibition and germination of seeds of parasitic weed on the protein level take an analogous pathways for these aroyloxy SL mimics, this suggested hydrolysis of the ester substituent cannot account for the blocking effect of a methyl group at C-4 of the butenolide ring on the germination activity (Zwanenburg et al 2013)
Summary
Strigolactones (SLs) constitute a new class of plant hormones which are of increasing importance in plant science. This implies that the bioactiphore resides in the CD part of SLs. The information presented above allows the design of a model compound for SL analogs with germinating activity (Fig. 3).
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