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Plant Signal Behav. 2013 Mar;8(3):e23497. doi: 10.4161/psb.23497. Epub 2013 Jan 18.

Grafting analysis indicates that malfunction of TRICOT in the root causes a nodulation-deficient phenotype in Lotus japonicus.

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  • 1Division of Symbiotic Systems; National Institute for Basic Biology; Aichi, Japan; Department of Basic Biology; School of Life Science; Graduate University for Advanced Studies (SOKENDAI); Aichi, Japan.


Leguminous plants develop root nodules in symbiosis with soil rhizobia. Nodule formation occurs following rhizobial infection of the host root that induces dedifferentiation of some cortical cells and the initiation of a new developmental program to form nodule primordia. In a recent study, we identified a novel gene, TRICOT (TCO), that acts as a positive regulator of nodulation in Lotus japonicus. In addition to its role in nodulation, tco mutant plants display pleiotropic defects including abnormal shoot apical meristem formation. Here, we investigated the effect of the tco mutation on nodulation using a grafting approach. The results strongly indicate that the nodulation-deficient phenotype of the mutant results from malfunction of the TCO gene in the root.


AMP1; Lotus japonicus; TCO; carboxypeptidase; grafting; nodulation; root nodule symbiosis

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