Brassinosteroids play multiple roles in nodulation of pea via interactions with ethylene and auxin

We examined the influence of brassinosteroids on the various stages of infection and nodule development

Peter N. McGuiness; James B. Reid; Eloise Foo

2020

Scholarcy highlights

  • A comprehensive analysis of the role of brassinosteroids in nodulation, including their interactions with auxin and ethylene revealed that brassinosteroids inhibit infection, promote nodule initiation but do not influence nodule organogenesis or function
  • We examined the influence of brassinosteroids on the various stages of infection and nodule development
  • We show that brassinosteroids inhibit the early stages of nodulation, including auxin accumulation, root hair deformation and infection thread formation, and demonstrate that infection thread formation is regulated by brassinosteroids in an ethylene independent manner
  • Brassinosteroids positively influence the ultimate number of nodules formed, we found that brassinosteroid-deficiency did not influence nodule structure including the vascular pattern of auxin activity or nitrogen-fixation capacity
  • These findings suggest that brassinosteroids are negative regulators of infection but positive regulators of nodule initiation
  • Given the influence of brassinosteroids on discreet stages of nodulation but not nodule function, manipulation of brassinosteroids may be an interesting avenue for future research on the optimisation of nodulation

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