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Root developmental programs shape the Medicago truncatula nodule meristem
- Source :
- Development, 142, 2941-2950, Development 142 (2015)
- Publication Year :
- 2015
-
Abstract
- Nodules on the roots of legume plants host nitrogen-fixing rhizobium bacteria. Several lines of evidence indicate that nodules are evolutionary related to roots. We determined whether developmental control of the Medicago truncatula nodule meristem bears resemblance to that in root meristems through analyses of root meristem expressed PLETHORA genes. In nodules, MtPLETHORA1 and 2 genes are preferentially expressed in cells positioned at the periphery of the meristem abutting nodule vascular bundles. Their expression overlaps with an auxin response maximum and MtWOX5 that is a marker for the root quiescent centre. Strikingly, the cells in the central part of the nodule meristem have a high level of cytokinin and display MtPLETHORA 3 and 4 gene expression. Nodule-specific knock-down of MtPLETHORA genes results in reduced number of nodules and/or in nodules in which meristem activity has ceased. Our nodule gene expression map indicates that the nodule meristem is composed of two distinct domains in which different MtPLETHORA gene subsets are expressed. Our mutant studies show that MtPLETHORA genes redundantly function in nodule meristem maintenance. This indicates that Rhizobium has recruited root developmental programs for nodule formation
- Subjects :
- Plant stem cell
Cytokinins
Meristem
Plant Developmental Biology
Genes, Plant
PLETHORA genes
Auxin
Gene Expression Regulation, Plant
Botany
Medicago truncatula
Nodule meristem
medicine
Laboratorium voor Moleculaire Biologie
DR5
Promoter Regions, Genetic
Molecular Biology
Glucuronidase
Plant Proteins
chemistry.chemical_classification
biology
Indoleacetic Acids
EPS-1
fungi
Gene Expression Regulation, Developmental
food and beverages
Nodule (medicine)
Meristem maintenance
biology.organism_classification
Plants, Genetically Modified
Cell biology
ABC model of flower development
Phenotype
chemistry
Rhizobium
RNA Interference
Laboratory of Molecular Biology
medicine.symptom
Root Nodules, Plant
Developmental Biology
Subjects
Details
- Language :
- English
- ISSN :
- 09501991
- Database :
- OpenAIRE
- Journal :
- Development, 142, 2941-2950, Development 142 (2015)
- Accession number :
- edsair.doi.dedup.....a44f7835f56ce92cca3947172641157f