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Cell-layer specific roles for gibberellins in nodulation and root development.

Karen Velandia1, Alejandro Correa-Lozano1, Peter M McGuiness1

  • 1Discipline of Biological Sciences, School of Natural Sciences, University of Tasmania, Private Bag 55, Hobart, TAS, 7001, Australia.

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Summary
This summary is machine-generated.

Gibberellins (GA) produced in pea endodermis promote lateral root and nodule development. GA also suppress rhizobial infection by regulating auxin and cytokinin responses.

Keywords:
auxincytokiningibberellinnodulationrhizobial infectionroot development

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Area of Science:

  • Plant biology
  • Molecular genetics
  • Hormone signaling

Background:

  • Gibberellins (GA) are crucial for lateral root formation.
  • The specific roles of GA in cell-specific events during lateral root formation, rhizobial infection, and nodule organogenesis, including interactions with auxin and cytokinin (CK), remain unclear.

Purpose of the Study:

  • To investigate the cell-specific functions of GA in lateral root and nodule development.
  • To elucidate the interaction of GA with auxin and cytokinin during these processes.
  • To understand GA's role in rhizobial infection and nodule organogenesis in pea (Pisum sativum).

Main Methods:

  • Epidermal- and endodermal-specific complementation of a GA-deficient pea mutant (na) using Agrobacterium rhizogenes.
  • Analysis of spatial expression patterns of cytokinin (TCSn) and auxin (DR5) responsive promoters.
  • Measurement of hormone levels in GA mutants.

Main Results:

  • Endodermis-derived GA promote lateral root and nodule organogenesis.
  • Epidermal GA suppress rhizobial infection but have minimal impact on organ development.
  • GA produced in the endodermis induce a mobile signal that suppresses rhizobial infection.
  • GA suppress cytokinin response in the cortex and are essential for auxin activation during nodule primordia formation.

Conclusions:

  • GA regulate critical checkpoints between infection thread penetration and nodule development.
  • GA limit infection thread progression and branching in the cortex by modulating cytokinin response.
  • GA promote nodule primordia development by activating auxin response.