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

Science  05 Jan 2007:
Vol. 315, Issue 5808, pp. 101-104
DOI: 10.1126/science.1132514

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Abstract

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.

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