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Related Experiment Video

Updated: Apr 5, 2026

Generation of Composite Plants in Medicago truncatula used for Nodulation Assays

Generation of Composite Plants in Medicago truncatula used for Nodulation Assays

Published on: March 27, 2011

Root developmental programs shape the Medicago truncatula nodule meristem.

Henk J Franssen¹, Ting Ting Xiao², Olga Kulikova²

¹Department of Plant Sciences, Laboratory of Molecular Biology, Wageningen University, Droevendaalsesteeg 1, Wageningen 6708 PB, The Netherlands henk.franssen@wur.nl.

Development (Cambridge, England)

|August 9, 2015

Summary

This summary is machine-generated.

Legume root nodules, formed by Rhizobium bacteria, utilize root developmental programs. PLETHORA genes, crucial for root meristem maintenance, are also essential for nodule meristem activity and development.

Keywords:

DR5 Medicago truncatula Nodule meristem PLETHORA genes

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Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula

Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula

Published on: June 9, 2015

Area of Science:

Plant developmental biology
Molecular genetics
Symbiotic interactions

Background:

Legume root nodules house nitrogen-fixing Rhizobium bacteria.
Evidence suggests evolutionary links between root nodules and plant roots.
The PLETHORA (PLT) gene family regulates root meristem development.

Purpose of the Study:

To investigate the resemblance between Medicago truncatula nodule meristem development and root meristem control.
To analyze the role of PLETHORA genes in nodule meristem function.

Main Methods:

Analysis of PLETHORA gene expression in Medicago truncatula nodules.
Gene expression mapping of nodule meristems.
Nodule-specific knockdown of PLETHORA genes using mutant studies.

Main Results:

MtPLETHORA 1 and 2 are expressed in nodule meristem periphery, overlapping with auxin maxima and MtWOX5.
MtPLETHORA 3 and 4 are expressed in the central nodule meristem with high cytokinin levels.
Nodule-specific PLETHORA gene knockdown led to fewer nodules or ceased meristem activity.
Nodule meristems comprise two distinct domains with differential MtPLETHORA subset expression.
MtPLETHORA genes exhibit functional redundancy in maintaining nodule meristem activity.

Conclusions:

Rhizobium has co-opted ancestral root developmental programs for nodule formation.
PLETHORA genes are essential for nodule meristem maintenance and development in legumes.
The nodule meristem is organized into distinct domains regulated by specific PLETHORA gene subsets.