EFFECT OF CO_2 ENRICHMENT AND NITRATE APPLICATION ON GROWTH AND DINITROGEN FIXATION OF WILD AND CULTIVATED SOYBEAN PLANTS DURING POD-FILLING STAGE

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A wild soybean variety (Glycine soja Sieb. and Zucc. line Nakei-No. 1) and a cultivated soybean variety (Glycine max L. Merr. cv. Tamahomare) were subjected to treatments of CO_2 enrichment and/or 50 ppm nitrate (NO_3-N) application during the pod-filling period and the growth and dinitrogen fixation of the plants were examined. 1.The whole plant weight of the soybean cultivar was increased by CO_2 enrichment and did not change by NO_3-N application, whereas the wild soybean variety responded neither to CO_2 enrichment nor to NO_3-N application. In the wild soybean variety, CO_2 enrichment promoted yellowing and death of leaves, while NO_3-N application prevented those phenomena from occuring. 2. In the absence of NO_3-N in the culture medium, the dinitrogen-fixing activity in the soybean cultivar increased by CO_2 enrichment, whereas it decreased in the wild soybean variety. In the soybean cultivar, the adverse effect of NO_3-N on the dinitrogen fixation was alleviated by CO_2 enrichment. 3. The whole plant N increment of the soybean cultivar increased by CO_2 enrichment and/or NO_3-N application, whereas the reverse trend was observed in the wild soybean variety. In the presence of NO_3-N in the culture medium, CO_2 enrichment led to an increase in the accumulation of fixed-N and to a decrease in the combined-N accumulation in both varieties. 4. The concentration of sugars and starch in the leaves of both varieties increased by CO_2 enrichment, especially the starch concentration in the leaf blades of the soybean cultivar and that in the yellow leaves of the wild variety. For the nodules, CO_2 enrichment tended to increase the concentration of sugars and starch in the cultivar but to decrease that of the wild variety. 5. CO_2 enrichment led to an increase in the export rate photosynthetically fixed 14^C from leaves to other parts in the cultivar, but did not affect it in the wild variety. The 14^C distribution percentage in nodules decreased only in the wild variety by CO_2 enrichment. Based on these results, it is assumed that during the pod-filling period, the growth of the cultivar is limited by photosynthate supply, while that of the wild variety is limited mainly by the low ability to receive photosynthates and N.
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EFFECT OF CO_2 ENRICHMENT AND NITRATE APPLICATION ON GROWTH AND DINITROGEN FIXATION OF WILD AND CULTIVATED SOYBEAN PLANTS DURING POD-FILLING STAGE

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