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Shoot-derived cytokinins systemically regulate root nodulation
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DOI：10.1038/ncomms5983.png)
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Abstract
En 中文
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.
Keywords:
RECEPTOR-LIKE KINASE
MEDIUM-POLARITY FRACTION
LONG-DISTANCE CONTROL
LOTUS-JAPONICUS
WILD-TYPE
RESTRICTING SUBSTANCES
PLANT TRANSFORMATION
NODULE ORGANOGENESIS
ARABIDOPSIS ABCG14
SOYBEAN PLANTS
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