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Strigolactones (SLs) are well known for their role in repressing shoot branching. In pea, increased transcript levels of SL biosynthesis genes are observed in stems of highly branched SL deficient ( ramosus1  ( rms1 ) and  rms5 ) and SL response ( rms3  and  rms4 ) mutants indicative of negative feedback control. In contrast, the highly branched  rms2  mutant has reduced transcript levels of SL biosynthesis genes. Grafting studies and hormone quantification led to a model where  RMS2  mediates a shoot-to-root feedback signal that regulates both SL biosynthesis gene transcript levels and xylem sap levels of cytokinin exported from roots. Here we cloned  RMS2  using synteny with  Medicago truncatula  and demonstrated that it encodes a putative auxin receptor of the AFB4/5 clade. Phenotypes similar to  rms2  were found in Arabidopsis  afb4/5  mutants, including increased shoot branching, low expression of SL biosynthesis genes and high auxin levels in stems. Moreover,  afb4/5  and  rms2  display a specific resistance to the herbicide picloram. Yeast-two-hybrid experiments supported the hypothesis that the RMS2 protein functions as an auxin receptor. SL root feeding using hydroponics repressed auxin levels in stems and down-regulated transcript levels of auxin biosynthesis genes within one hour. This auxin down-regulation was also observed in plants treated with the polar auxin transport inhibitor NPA. Together these data suggest a homeostatic feedback loop in which auxin up-regulates SL synthesis in an RMS2-dependent manner and SL down-regulates auxin synthesis in an RMS3 and RMS4-dependent manner.

The pea branching RMS2 gene encodes the PsAFB4/5 auxin receptor and is involved in an auxin-strigolactone regulation loop