Probable site of allantoin formation in nodulating soybean plants |
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Authors: | Shinsuke Fujihara Masuro Yamaguchi |
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Institution: | Department of Agricultural Chemistry, College of Agriculture, University of Osaka Prefecture, 4-cho, Mozu-umemachi, Sakai, Osaka 591, Japan |
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Abstract: | Nodulated soybean plants contain high concentration of allantoin in all parts. Excision of nodules from the roots brought about a marked decrease in allantoin. To examine the function of nodules in allantoin production, nodulated and nodule-detached soybeans were fed with 15NH3 for 1 week. High abundance of 15N was found in the amino acid-N fraction of both plants. In the root and stem of the nodulated plants, ca 80% of the nitrogen in this fraction was derived from the NH3 added in the medium. Excess 15N was detected also in allantoin-N fraction, but the 15N content was very low in contrast to that in amino acid-N fraction. The site involved in the allantoin formation and the possible significance of its synthesis are discussed in relation to symbiotic nitrogen fixation. |
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Keywords: | Leguminosae soybean nitrogen fixation ammonia assimilation allantoin formation |
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