Figure 1.

Strigolactones (SLs) may have a role in plant developmental plasticity in both roots and shoots, in response to environmental cues such as light and nutrient status. SLs have been shown to inhibit shoot branching, mediated by either auxin transport or auxin signaling, whereas both auxin and SLs have the ability to change each other's levels and distribution. SLs have been shown to increase plant light-harvesting capability, but the effects of light harvesting on SL production or sensitivity are not clear (dashed arrow). Low levels of nutrients (e.g., Pi, N) might increase SL production in roots, whereas SLs or their putative precursor may lead to alteration of root development, which may be mediated via auxin transport.