Strigolactones Stimulate Internode Elongation Independently of Gibberellins

We show that this dwarfism in pea is not attributable to the strong branching of the mutants

Alexandre de Saint Germain; Yasmine Ligerot; Elizabeth A. Dun; Jean-Paul Pillot; John J. Ross; Christine A. Beveridge; Catherine Rameau


Scholarcy highlights

  • Strigolactone mutants in diverse species show reduced stature in addition to their extensive branching
  • To investigate whether the reduced height of the pea SL-related mutants is due to their high branching, we determined the impact of manual bud removal on internode lengths of wild-type, rms1, rms4, and Psbrc1 plants
  • Further examination of the effect of shoot branching on stem elongation revealed that bud outgrowth inhibited by exogenous treatment of the synthetic SL GR24 directly to all axillary buds of SL-deficient rms1-1 mutant plants did not lead to a significant increase in plant height
  • Our results suggest that SLs may affect internode elongation independently of their function in bud outgrowth inhibition and that the reduced stature of the SL-related mutants is not a consequence of their increased branching phenotype
  • Applying GR24 to the shoot tip of SL-deficient rms1 plants had no effect on main stem internode elongation, suggesting that SL function in stem elongation is unlikely to be performed at the shoot tip
  • We have shown by exogenous SL applications that control of branching and internode elongation can be independent
  • In natural conditions, these multiple actions of SLs are coordinated or not needs further investigation

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