Strigolactone inhibition of shoot branching

We present evidence that carotenoid cleavage dioxygenase 8 shoot branching mutants of pea are strigolactone deficient and that strigolactone application restores the wild-type branching phenotype to ccd8 mutants

Victoria Gomez-Roldan


Key concepts

Scholarcy highlights

  • A carotenoid-derived hormonal signal that inhibits shoot branching in plants has long escaped identification
  • Strigolactones are compounds thought to be derived from carotenoids and are known to trigger the germination of parasitic plant seeds and stimulate symbiotic fungi
  • In agreement with the expected properties of the hormonal signal, exogenous strigolactone can be transported in shoots and act at low concentrations
  • We suggest that endogenous strigolactones or related compounds inhibit shoot branching in plants
  • Ccd8 mutants demonstrate the diverse effects of strigolactones in shoot branching, mycorrhizal symbiosis and parasitic weed interaction
  • K. et al Nitrogen deficiency as well as phosphorus deficiency in sorghum promotes the production and exudation of 5-deoxystrigol, the host recognition signal for arbuscular mycorrhizal fungi and root parasites

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