The SNARE protein SYP71 expressed in vascular tissues is involved in symbiotic nitrogen fixation in Lotus japonicus nodules

Tsuneo Hakoyama, Ryo Oi, Kazuya Hazuma, Eri Suga, Yuka Adachi, Mayumi Kobayashi, Rie Akai, Shusei Sato, Eigo Fukai, Satoshi Tabata, Satoshi Shibata, Guo Jiang Wu, Yoshihiro Hase, Atsushi Tanaka, Masayoshi Kawaguchi, Hiroshi Kouchi, Yosuke Umehara, Norio Suganuma

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)

    Abstract

    Soluble N-Ethylmaleimide Sensitive Factor Attachment Protein Receptor (SNARE) proteins are crucial for signal transduction and development in plants. Here, we investigate a Lotus japonicus symbiotic mutant defective in one of the SNARE proteins. When in symbiosis with rhizobia, the growth of the mutant was retarded compared with that of the wild-type plant. Although the mutant formed nodules, these exhibited lower nitrogen fixation activity than the wild type. The rhizobia were able to invade nodule cells, but enlarged symbiosomes were observed in the infected cells. The causal gene, designated LjSYP71 (for L. japonicus syntaxin of plants71), was identified by map-based cloning and shown to encode a Qc-SNARE protein homologous to Arabidopsis (Arabidopsis thaliana) SYP71. LjSYP71 was expressed ubiquitously in shoot, roots, and nodules, and transcripts were detected in the vascular tissues. In the mutant, no other visible defects in plant morphology were observed. Furthermore, in the presence of combined nitrogen, the mutant plant grew almost as well as the wild type. These results suggest that the vascular tissues expressing LjSYP71 play a pivotal role in symbiotic nitrogen fixation in L. japonicus nodules.

    Original languageEnglish
    Pages (from-to)897-905
    Number of pages9
    JournalPlant physiology
    Volume160
    Issue number2
    DOIs
    Publication statusPublished - 2012 Oct

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science

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