Shoot control of root development and nodulation is mediated by a receptor-like kinase

Lene Krusell, Lene H. Madsen, Shusei Sato, Grégoire Aubert, Aratz Genua, Krzysztof Szczyglowski, Gérard Duc, Takakazu Kaneko, Satoshi Tabata, Frans de Bruijn, Eloisa Pajuelo, Niels Sandal and Jens Stougaard ()
Additional contact information
Lene Krusell: University of Aarhus
Lene H. Madsen: University of Aarhus
Shusei Sato: Kazusa DNA Research Institute
Grégoire Aubert: Institut National de la Recherche Agronomique (INRA), Unite de Recherche de Genetique et D'Amelioration des Plantes (URGAP)
Aratz Genua: University of Aarhus
Krzysztof Szczyglowski: Agriculture and Agri-Food Canada, SCPFRC
Gérard Duc: Institut National de la Recherche Agronomique (INRA), Unite de Recherche de Genetique et D'Amelioration des Plantes (URGAP)
Takakazu Kaneko: Kazusa DNA Research Institute
Satoshi Tabata: Kazusa DNA Research Institute
Frans de Bruijn: Laboratoire de Biologie Moleculaire des Relations Plantes-Microorganismes
Eloisa Pajuelo: University of Aarhus
Niels Sandal: University of Aarhus
Jens Stougaard: University of Aarhus

Nature, 2002, vol. 420, issue 6914, 422-426

Abstract: Abstract In legumes, root nodule organogenesis is activated in response to morphogenic lipochitin oligosaccharides that are synthesized by bacteria, commonly known as rhizobia1. Successful symbiotic interaction results in the formation of highly specialized organs called root nodules, which provide a unique environment for symbiotic nitrogen fixation. In wild-type plants the number of nodules is regulated by a signalling mechanism integrating environmental and developmental cues to arrest most rhizobial infections within the susceptible zone of the root2,3,4,5,6,7. Furthermore, a feedback mechanism controls the temporal and spatial susceptibility to infection of the root system. This mechanism is referred to as autoregulation of nodulation, as earlier nodulation events inhibit nodulation of younger root tissues3,4,8. Lotus japonicus plants homozygous for a mutation in the hypernodulation aberrant root (har1) locus escape this regulation and form an excessive number of nodules9,10,11. Here we report the molecular cloning and expression analysis of the HAR1 gene and the pea orthologue, Pisum sativum, SYM29. HAR1 encodes a putative serine/threonine receptor kinase, which is required for shoot-controlled regulation of root growth, nodule number, and for nitrate sensitivity of symbiotic development.

Date: 2002
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DOI: 10.1038/nature01207

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