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

2016

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

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