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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Related Experiment Video

Updated: May 29, 2026

Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean
10:58

Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean

Published on: December 23, 2017

Strigolactones promote nodulation in pea.

Eloise Foo1, Noel W Davies

  • 1School of Plant Science, University of Tasmania, Private Bag 55, Hobart, TAS, 7001, Australia. eloise.foo@utas.edu.au

Planta
|September 20, 2011
PubMed
Summary

Strigolactones, plant hormones, positively regulate legume nodulation. This study shows they are crucial for optimal pea nodule numbers, not just formation.

Area of Science:

  • Plant Biology
  • Hormonal Regulation
  • Symbiotic Interactions

Background:

  • Strigolactones are recently identified plant hormones.
  • They influence mycorrhizal symbiosis and plant architecture.
  • Their role in legume-Rhizobium symbiosis (nodulation) is largely unexplored.

Purpose of the Study:

  • To investigate the role of endogenous strigolactones in regulating nodulation in pea plants.
  • To determine if strigolactones are essential for nodule formation or number.
  • To identify the site of strigolactone action (root vs. shoot) in nodulation control.

Main Methods:

  • Utilized the strigolactone-deficient pea mutant (rms1).
  • Analyzed nodule number in wild-type and mutant plants.
  • Applied synthetic strigolactone (GR24) to assess its effect.

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Single-plant, Sterile Microcosms for Nodulation and Growth of the Legume Plant Medicago truncatula with the Rhizobial Symbiont Sinorhizobium meliloti

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Last Updated: May 29, 2026

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Published on: December 23, 2017

Generation of Composite Plants in Medicago truncatula used for Nodulation Assays
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20:01

Single-plant, Sterile Microcosms for Nodulation and Growth of the Legume Plant Medicago truncatula with the Rhizobial Symbiont Sinorhizobium meliloti

Published on: October 1, 2013

  • Conducted grafting experiments between wild-type and mutant plants.

    • Main Results:

    • The rms1 mutant exhibited significantly fewer nodules (approx. 40% reduction) compared to wild-type.
    • Exogenous GR24 application increased nodule numbers in both wild-type and rms1 mutant plants.
    • Grafting studies indicated that strigolactones in the root, not the shoot, regulate nodule number.

    Conclusions:

    • Endogenous strigolactones are positive regulators of nodulation in pea, essential for optimal nodule number.
    • Strigolactones act directly within the root to control nodule numbers.
    • This research provides the first direct evidence that shoots do not significantly contribute to root strigolactone levels influencing nodulation.