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Originally published in Science Express on 16 November 2006
Science 5 January 2007:
Vol. 315. no. 5808, pp. 101 - 104
DOI: 10.1126/science.1132514
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Reports

A Cytokinin Perception Mutant Colonized by Rhizobium in the Absence of Nodule Organogenesis

Jeremy D. Murray,1 Bogumil J. Karas,1 Shusei Sato,2 Satoshi Tabata,2 Lisa Amyot,1 Krzysztof Szczyglowski1*

In legumes, Nod-factor signaling by rhizobia initiates the development of the nitrogen-fixing nodule symbiosis, but the direct cell division stimulus that brings about nodule primordia inception in the root cortex remains obscure. We showed that Lotus japonicus plants homozygous for a mutation in the HYPERINFECTED 1 (HIT1) locus exhibit abundant infection-thread formation but fail to initiate timely cortical cell divisions in response to rhizobial signaling. We demonstrated that the corresponding gene encodes a cytokinin receptor that is required for the activation of the nodule inception regulator Nin and nodule organogenesis.

1 Agriculture and Agri-Food Canada, Southern Crop Protection and Food Research Centre, 1391 Sandford Street, London, Ontario N5V 4T3, Canada.
2 Kazusa DNA Research Institute, Kisarazu, Chiba, 292-0812, Japan.

* To whom correspondence should be addressed. E-mail: szczyglowskik{at}agr.gc.ca

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Genome Structure of the Legume, Lotus japonicus.
S. Sato, Y. Nakamura, T. Kaneko, E. Asamizu, T. Kato, M. Nakao, S. Sasamoto, A. Watanabe, A. Ono, K. Kawashima, et al. (2008)
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Legumes Symbioses: Absence of Nod Genes in Photosynthetic Bradyrhizobia.
E. Giraud, L. Moulin, D. Vallenet, V. Barbe, E. Cytryn, J.-C. Avarre, M. Jaubert, D. Simon, F. Cartieaux, Y. Prin, et al. (2007)
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Overlap of Proteome Changes in Medicago truncatula in Response to Auxin and Sinorhizobium meliloti.
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A Gain-of-Function Mutation in a Cytokinin Receptor Triggers Spontaneous Root Nodule Organogenesis.
L. Tirichine, N. Sandal, L. H. Madsen, S. Radutoiu, A. S. Albrektsen, S. Sato, E. Asamizu, S. Tabata, and J. Stougaard (2007)
Science 315, 104-107
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