Physiological Effects of the Synthetic Strigolactone Analog GR24 on Root System Architecture in Arabidopsis: Another Belowground Role for Strigolactones?

These results suggest that strigolactones are able to modulate local auxin levels and that the net result of strigolactone action is dependent on the auxin status of the plant

Carolien Ruyter-Spira; Wouter Kohlen; Tatsiana Charnikhova; Arjan van Zeijl; Laura van Bezouwen; Norbert de Ruijter; Catarina Cardoso; Juan Antonio Lopez-Raez; Radoslava Matusova; Ralph Bours; Francel Verstappen; Harro Bouwmeester


Scholarcy highlights

  • Strigolactones, exuded from plants, have been known for a long time to act as germination stimulants for seeds of root parasitic plants such as Orobanche and Striga spp
  • Pi starvation was shown to reduce the number of shoot branches which was recently proven to be related to increased strigolactone production observed under these conditions The discovery that strigolactones are the same as, or are at least closely related to this branching inhibiting signal, which is a major player in the process of apical dominance, unexpectedly merged two worlds of research and provides new mutual tools and insights
  • When arabidopsis plants were grown in the presence of the synthetic strigolactone analogue GR24, primary root length was enhanced
  • When exogenous auxin was applied, GR24 stimulated LR outgrowth which further supports that strigolactones and auxin interact in this process
  • The fact that the development of LRs in wild type plants was enhanced during Pi limiting conditions, but not in the strigolactone deficient max mutant plants, demonstrates that endogenous strigolactones play an important role in determining root architecture.In addition to this, wild type and max mutant plantsshow differences in root length
  • This was only significant for max4 and not max1 and max2, the majority of stage V lateral root primordia in max mutant plants is associated with a clear DR5-GUS signal, showing the presence of a properly formed auxin maximum
  • It is likely that under Pi-sufficient conditions, endogenous strigolactones in wild type plants suppress lateral root primordia development through a further reduction in already sub-optimal auxin level/sensitivity

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