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Plant and Cell Physiology, 1986, Vol. 27, No. 3 399-405
© 1986

Article

Increase in the Formation and Nitrogen Fixation of Soybean Nodules by Vesicular-Arbuscular Mycorrhiza

Yoshitaka Kawai and Yukio Yamamoto1

Department of Agronomy, School of Agriculture, Nagoya University Chikusa, Nagoya 464, Japan

1To whom requests for reprints should be addressed.

Symbiotic interactions of the tripartite association of soybean plant, vesiculararbuscular (VA) mycorrhizal fungus and Rhizobium japonicum were shown.

Mycorrhizal plants absorbed more P, Ca and Mg and had higher P, Ca and Mg contents in their stems or leaves than non-mycorrhizal plants. Phosphorus concentration was also higher in the nodules of mycorrhizal plants.

VA mycorrhizae increased nodule number, nodule weight and acetylene reduction activity of nodules. Concomitantly seed production and N content of leaves were enhanced.

Both nodulating (A62-1) and non-nodulating (A62-2) cultivars of soybean plants [Glycine max (L.) Merr.] were colonized by VA mycorrhizal fungi, identified as belonging to the genus Glomus.

(Received August 12, 1985; Accepted January 14, 1986)
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