• Science · Jan 2007

    A cytokinin perception mutant colonized by Rhizobium in the absence of nodule organogenesis.

    • Jeremy D Murray, Bogumil J Karas, Shusei Sato, Satoshi Tabata, Lisa Amyot, and Krzysztof Szczyglowski.
    • Agriculture and Agri-Food Canada, Southern Crop Protection and Food Research Centre, 1391 Sandford Street, London, Ontario N5V 4T3, Canada.
    • Science. 2007 Jan 5;315(5808):101-4.

    AbstractIn 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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