Partitioning and Utilization of Photosynthate Produced at Different Growth Stages after Anthesis in Soybean (Glycine maxL. Merr.): Analysis by Long-term13C-Labelling Experiments

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Abstract
Yamagata, M., Kouchi, H. and Yoneyama, T. 1987. Partitioning and utilization of photosynthate produced at different growth stages after anthesis in soybean (Glycine max L. Merr.): Analysis by long term 13C-labelling experiments.—J. exp. Bot. 38: 1247–1259. Soybean (Glycine max L. Merr. var. Akishirome) plants were allowed to assimilate 13CO2 with a constant specific activity for 10 h at different growth stages (a total of seven times at about one week intervals) after anthesis. The plants were harvested periodically until the time of full maturity and the partitioning of 13C into individual plant parts was investigated with an emphasis on the contribution of carbon assimilated at different growth stages to the seed formation. Carbon assimilated at the middle to late seed-filling stage contributed most to the seed production; one day contribution accounted for 3–4% in total carbon of the seed at full maturity. Integrated contribution of carbon assimilated after anthesis was estimated as 96% of the final seed carbon. An approximation based on the temporal data of the incorporation of labelled carbon into the seeds indicates that 77% of the final seed carbon came from direct transfer of current photosynthate from source leaves, which occurred within a few days after the photosynthetic fixation, while the rest originated from remobilization of carbon reserved mainly in leaves and stems plus petioles. In comparison with the total carbon accumulation in the seeds, protein carbon in the seeds was relatively more dependent on photosynthate produced during the early period of reproductive growth stage, whereas lipid carbon was more dependent on photosynthate produced during the later reproductive stage.

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