Bradyrhizobium elkanii induces outer cortical root swelling in soybean

Ken Ichi Yuhashi, Shoichiro Akao, Hideyuki Fukuhara, Eiji Tateno, Jong Yoon Chun, Gary Stacey, Hiromichi Hara, Masatsugu Kubota, Teruo Asami, Kiwamu Minamisawa

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


When soybean roots were inoculated with Bradyrhizobium elkanii USDA76, USDA94 or USDA31, a localized swelling of the root outer cortical cells was observed within 10 days after inoculation. This phenotype was designated outer cortical swelling (OCS). OCS was not observed in roots inoculated with B.japonicum USDA110 or USDA122. Therefore, the OCS response appears to be specific for B. elkanii. To determine the involvement of the nodulation genes in OCS formation, we constructed a nod- mutant, strain USDA94δNOD, of B. elkanii USDA94 in which the nodD2D1KABC genes were deleted. An OCS response was observed on roots inoculated with USDA94δNOD, indicating that the lipo-chitin nodulation signals synthesized by the nodABC gene products are not required for OCS formation.

Original languageEnglish
Pages (from-to)1571-1577
Number of pages7
JournalPlant and Cell Physiology
Issue number8
Publication statusPublished - 1995 Dec


  • Bradyrhizobium elkanii
  • Nod factor
  • Root swelling
  • Soybean

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology


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