Strigolactone regulates shoot development through a core signalling pathway

We find that all examined strigolactone responses are regulated by SCFMAX2 and D14, and not by other D14-like proteins

Tom Bennett; Yueyang Liang; Madeleine Seale; Sally Ward; Dörte Müller; Ottoline Leyser


Scholarcy highlights

  • Plant development is a continuous process that is modulated by multiple environmental stimuli
  • We demonstrate that BRI1 EMS SUPPRESOR1 and DELLA proteins are not targets of SL signalling in the regulation of shoot branching, nor likely any other aspect of shoot development
  • Present, MAX2 is apparently not involved in SL signalling in Physcomitrella patens, and current phylogenetic analyses suggest that the SL receptor D14 appears to have evolved only within the vascular plants
  • KARRIKIN INSENSITIVE2-type proteins are found throughout land plants and charophyte algae, suggesting the existence of an ancient KAI2mediated signalling pathway
  • It appears possible that the vascular plant canonical SL signalling pathway has arisen by duplication and divergence of the ancestral KAI2
  • Downstream targets of SL signalling With regard to events further downstream, we have shown that BRC1/BRC2 and PIN1, but not SPL9/SPL15, are plausible SL signalling targets in shoot development, but only in a sub-set of SL responses, shoot branching
  • This suggests that there could be separable EAR-dependent and -independent pathways downstream of SMXL7, which is consistent with our observation that neither altered PIN1 nor BRC1 levels can account for all the effects of SL in the adult shoot

Need more features? Save interactive summary cards to your Scholarcy Library.