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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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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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)
DNA Res
   Abstract »    Full Text »    PDF »
3-Hydroxy-3-Methylglutaryl Coenzyme A Reductase1 Interacts with NORK and Is Crucial for Nodulation in Medicago truncatula.
Z. Kevei, G. Lougnon, P. Mergaert, G. V. Horvath, A. Kereszt, D. Jayaraman, N. Zaman, F. Marcel, K. Regulski, G. B. Kiss, et al. (2007)
PLANT CELL 19, 3974-3989
   Abstract »    Full Text »    PDF »
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)
Science 316, 1307-1312
   Abstract »    Full Text »    PDF »
Overlap of Proteome Changes in Medicago truncatula in Response to Auxin and Sinorhizobium meliloti.
G. E. van Noorden, T. Kerim, N. Goffard, R. Wiblin, F. I. Pellerone, B. G. Rolfe, and U. Mathesius (2007)
Plant Physiology 144, 1115-1131
   Abstract »    Full Text »    PDF »
Medicago truncatula NIN Is Essential for Rhizobial-Independent Nodule Organogenesis Induced by Autoactive Calcium/Calmodulin-Dependent Protein Kinase.
J. F. Marsh, A. Rakocevic, R. M. Mitra, L. Brocard, J. Sun, A. Eschstruth, S. R. Long, M. Schultze, P. Ratet, and G. E.D. Oldroyd (2007)
Plant Physiology 144, 324-335
   Abstract »    Full Text »    PDF »
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
   Abstract »    Full Text »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)