Atypical Receptor Kinase RINRK1 Required for Rhizobial Infection but not Nodule Development in Lotus japonicus

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DOI

  • Xiaolin Li, sippe CITY: shanghai China [CN].
  • ,
  • Zhiqiong Zheng, Shanghai institute of plant physiology and ecology CITY: Shanghai China [CN].
  • ,
  • Xiangxiao Kong, Shanghai institute of plant physiology and ecology CITY: Shanghai China [CN].
  • ,
  • Ji Xu, Shanghai institute of plant physiology and ecology CITY: Shanghai China [CN].
  • ,
  • Liping Qiu, Shanghai institute of plant physiology and ecology CITY: Shanghai China [CN].
  • ,
  • Jongho Sun, John Innes Centre,UK CITY: Norwich United Kingdom [GB].
  • ,
  • Dugald Elgin Reid
  • Haojie Jin, Carnegie Institution for Science CITY: Stanford STATE: CA POSTAL_CODE: 94305 United States Of America [US].
  • ,
  • Stig U Andersen
  • Giles E D Oldroyd, Sainsbury Laboratory, University of Cambridge CITY: Cambridge United Kingdom [GB].
  • ,
  • Jens Stougaard
  • J Allan Downie, John Innes Centre CITY: Norwich NR4 7UH POSTAL_CODE: . United Kingdom [GB].
  • ,
  • Fang Xie, Shanghai institute of plant physiology and ecology CITY: Shanghai POSTAL_CODE: 200032 China [CN] xiefang@sibs.ac.cn.

During the legume-rhizobium symbiotic interaction, rhizobial invasion of legumes is primarily mediated by a plant-made tubular invagination called an infection thread (IT). Here, we identify a gene in Lotus japonicus encoding a leucine-rich repeat receptor-like kinase (LRR-RLK), RINRK1 (Rhizobial Infection Receptor-like Kinase1), that is induced by Nod factors (NFs) and is involved in IT formation but not nodule organogenesis. A paralog, RINRK2, plays a relatively minor role in infection. RINRK1 is required for full induction of early infection genes, including Nodule Inception (NIN), encoding an essential nodulation transcription factor. RINRK1 displayed an infection-specific expression pattern, and NIN bound to the RINRK1 promoter, inducing its expression. RINRK1 was found to be an atypical kinase localized to the plasma membrane and did not require kinase activity for rhizobial infection. We propose RINRK1 is an infection-specific RLK, which may specifically coordinate output from NF signaling or perceive an unknown signal required for rhizobial infection.

Original languageEnglish
JournalPlant Physiology
ISSN0032-0889
DOIs
Publication statusE-pub ahead of print - 13 Aug 2019
Externally publishedYes

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