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 shoot-controlled regulation of root growth, nodule number, and for nitrate sensitivity of symbiotic development.
journal_name
Naturejournal_title
Natureauthors
Krusell L,Madsen LH,Sato S,Aubert G,Genua A,Szczyglowski K,Duc G,Kaneko T,Tabata S,de Bruijn F,Pajuelo E,Sandal N,Stougaard Jdoi
10.1038/nature01207keywords:
subject
Has Abstractpub_date
2002-11-28 00:00:00pages
422-6issue
6914eissn
0028-0836issn
1476-4687pii
nature01207journal_volume
420pub_type
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