Nitrogen fixation and metabolism in soybean [Glycine max] plants.
1991
Akao S.
Results of the studies, including relevant methodologies, on nitrogen fixation and metabolism in soybean plants which have been undertaken in Japan in the past 10 years are reviewed in this paper. Three methods, i.e. 15N2 gas feeding, 15N dilution and 15N natural abundance, were employed for estimating an amount of fixed nitrogen. In the two isogenic lines of soybean; non-nodulating (T201) and nodulating (T202) lines, the ratio of symbiotically fixed N in the total absorbed N were estimated to be 76% by the 15N dilution method, while it was 52% by the 15N natural abundance method. Contribution of the following three N sources; fertilizer, N2 fixation and soil-N, was estimated with a 15N tracer technique in combination with 15N natural abundance and with low level 15N application. Nodulating soybean plants obtained 13 +- 10% of their N from fertilizer, 66 +- 8% from n2 fixation and 21 +- 10% from soil N in Andosol. In the experiment in which nodules attached to the intact roots was exposed to 15N2, it was observed that the fixed N was rapidly translocated from bacteroids to plant cell cytosol in the form of ammonia, and assimilated by the GS/GOGAT system in the latter.
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