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Plant and Cell Physiology, 1995, Vol. 36, No. 8 1571-1577
© 1995

Bradyrhizobium elkanii Induces Outer Cortical Root Swelling in Soybean

Ken-Ichi Yuhashi1, Shoichiro Akao2, Hideyuki Fukuhara1, Eiji Tateno1, Jong-Yoon Chun3, Gary Stacey3, Hiromichi Hara1, Masatsugu Kubota1, Teruo Asami1 and Kiwamu Minamisawa1,4,5

1 School of Agriculture, Ibaraki University Ami, Ibaraki, 300-03 Japan
2 National Institute of Agrobiological Resources Tsukuba, Ibaraki, 305 Japan
3 Center for Legume Research, Department of Microbiology, University of Tennessee Knoxville, 77V37996-0845, U.S.A.
4 Institute of Genetic Ecology, Tohoku University Sendai, Miyagi, 980 Japan

5Corresponding author: School of Agriculture, Ibaraki University, Ami, Ibaraki, 300-03 Japan.

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 USDA94{delta}NOD, of B. elkanii USDA94 in which the nodD2D1KABC genes were deleted. An OCS response was observed on roots inoculated with USDA94{delta}NOD, indicating that the lipo-chitin nodulation signals synthesized by the nodABC gene products are not required for OCS formation.

(Received May 24, 1995; Accepted September 18, 1995)
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