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Shoot control of root development and nodulation is mediated by a receptor-like kinase.
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- Author(s): Krusell, Lene; Madsen, Lene H.; Sato, Shusei; Aubert, Grégoire; Genua, Aratz; Szczyglowski, Krzysztof; Duc, Gérard; Kaneko, Takakazu; Tabata, Satoshi; de Bruijn, Frans; Pajuelo, Eloisa; Sandal, Niels; Stougaard, Jens
- Source:
Nature. 11/28/2002, Vol. 420 Issue 6914, p422. 5p. - Source:
- Additional Information
- Subject Terms:
- Abstract: In legumes, root nodule organogenesis is activated in response to morphogenic lipochitin oligosaccharides that are synthesized by bacteria, commonly known as rhizobia. 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 root. 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 tissues. Lotus japonicus plants homozygous for a mutation in the hypernodulation aberrant root (har1) locus escape this regulation and form an excessive number of nodules. 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 shootcontrolled regulation of root growth, nodule number, and for nitrate sensitivity of symbiotic development. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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