Lotus japonicus ARPC1 is required for rhizobial infection

Md Shakhawat Hossain, Jinqiu Liao, Euan K. James, Shusei Sato, Satoshi Tabata, Anna Jurkiewicz, Lene H. Madsen, Jens Stougaard, Loretta Ross, Krzysztof Szczyglowski

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


Remodeling of the plant cell cytoskeleton precedes symbiotic entry of nitrogen-fixing bacteria within the host plant roots. Here we identify a Lotus japonicus gene encoding a predicted ACTIN-RELATED PROTEIN COMPONENT1 (ARPC1) as essential for rhizobial infection but not for arbuscular mycorrhiza symbiosis. In other organisms ARPC1 constitutes a subunit of the ARP2/3 complex, the major nucleator of Y-branched actin filaments. The L. japonicus arpc1 mutant showed a distorted trichome phenotype and was defective in epidermal infection thread formation, producing mostly empty nodules. A few partially colonized nodules that did form in arpc1 contained abnormal infections. Together with previously described L. japonicus Nckassociated protein1 and 121F-specific p53 inducible RNA mutants, which are also impaired in the accommodation of rhizobia, our data indicate that ARPC1 and, by inference a suppressor of cAMP receptor/WASP-family verpolin homologous protein-ARP2/3 pathway, must have been coopted during evolution of nitrogen-fixing symbiosis to specifically mediate bacterial entry.

Original languageEnglish
Pages (from-to)917-928
Number of pages12
JournalPlant physiology
Issue number2
Publication statusPublished - 2012 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science


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