Jeremy D. Murray1,2, Bogumil J. Karas1,2, Shusei Sato1,2, Satoshi Tabata1,2, Lisa Amyot1,2, Krzysztof Szczyglowski1,2
1Agriculture and Agri-Food Canada, Southern Crop Protection and Food Research Centre, 1391 Sandford Street, London, Ontario N5V 4T3, Canada.
2Kazusa DNA Research Institute, Kisarazu, Chiba 292-0812, Japan
Tóm tắt
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.
