Shoot-derived cytokinins systemically regulate root nodulation

Takema Sasaki, Takuya Suzaki, Takashi Soyano, Mikiko Kojima, Hitoshi Sakakibara and Masayoshi Kawaguchi ()
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Takema Sasaki: National Institute for Basic Biology
Takuya Suzaki: National Institute for Basic Biology
Takashi Soyano: National Institute for Basic Biology
Mikiko Kojima: Plant Productivity Systems Research Group, RIKEN Center for Sustainable Resource Science
Hitoshi Sakakibara: Plant Productivity Systems Research Group, RIKEN Center for Sustainable Resource Science
Masayoshi Kawaguchi: National Institute for Basic Biology

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Legumes establish symbiotic associations with nitrogen-fixing bacteria (rhizobia) in root nodules to obtain nitrogen. Legumes control nodule number through long-distance communication between roots and shoots, maintaining the proper symbiotic balance. Rhizobial infection triggers the production of mobile CLE-RS1/2 peptides in Lotus japonicus roots; the perception of the signal by receptor kinase HAR1 in shoots presumably induces the production of an unidentified shoot-derived inhibitor (SDI) that translocates to roots and blocks further nodule development. Here we show that, CLE-RS1/2-HAR1 signalling activates the production of shoot-derived cytokinins, which have an SDI-like capacity to systemically suppress nodulation. In addition, we show that LjIPT3 is involved in nodulation-related cytokinin production in shoots. The expression of LjIPT3 is activated in an HAR1-dependent manner. We further demonstrate shoot-to-root long-distance transport of cytokinin in L. japonicus seedlings. These findings add essential components to our understanding of how legumes control nodulation to balance nutritional requirements and energy status.

Date: 2014
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DOI: 10.1038/ncomms5983

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