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PLoS Genet. 2014 Dec 18;10(12):e1004891. doi: 10.1371/journal.pgen.1004891. eCollection 2014 Dec.

Local and systemic regulation of plant root system architecture and symbiotic nodulation by a receptor-like kinase.

Author information

1
Institut des Sciences du Végétal (ISV), CNRS, UPR2355, Gif-sur-Yvette, France.
2
Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma, United States of America.
3
INRA, UMR1347 Agroécologie, Dijon, France.

Abstract

In plants, root system architecture is determined by the activity of root apical meristems, which control the root growth rate, and by the formation of lateral roots. In legumes, an additional root lateral organ can develop: the symbiotic nitrogen-fixing nodule. We identified in Medicago truncatula ten allelic mutants showing a compact root architecture phenotype (cra2) independent of any major shoot phenotype, and that consisted of shorter roots, an increased number of lateral roots, and a reduced number of nodules. The CRA2 gene encodes a Leucine-Rich Repeat Receptor-Like Kinase (LRR-RLK) that primarily negatively regulates lateral root formation and positively regulates symbiotic nodulation. Grafting experiments revealed that CRA2 acts through different pathways to regulate these lateral organs originating from the roots, locally controlling the lateral root development and nodule formation systemically from the shoots. The CRA2 LRR-RLK therefore integrates short- and long-distance regulations to control root system architecture under non-symbiotic and symbiotic conditions.

PMID:
25521478
PMCID:
PMC4270686
DOI:
10.1371/journal.pgen.1004891
[Indexed for MEDLINE]
Free PMC Article

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