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Plant and Cell Physiology, 1994, Vol. 35, No. 8 1261-1265
© 1994

Short Communication

The Involvement of Indole-3-Acetic Acid Produced by Bradyrhizobium elkanii in Nodule Formation

Hideyuki Fukuhara1, Yasuo Minakawa1, Shoichiro Akao2 and Kiwamu Minamisawa1,3,4

1School of Agriculture, Ibaraki University Ami, Ibaraki, 300-03 Japan
2National Institute of Agrobiological Resources Tsukuba, Ibaraki, 305 Japan
3Center for Genetic Ecology, Tohoku University Sendai, Miyagi, 980 Japan

4To whom correspondence should be addressed.

IAA-deficient mutants T10, T27 and TN3 were isolated from B. elkanii USDA 31 by spontaneous and/or N-methyl-N'-nitro-N-nitrosoguanidine (NTG) mutageneses. Inoculation with these mutants significantly reduced the nodule number on soybean roots when compared to that of the parent strain. Furthermore, exogenous IAA application restored the nodule number of soybeans inoculated with TN3 to the original level.

(Received July 18, 1994; Accepted September 13, 1994)
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