Mechanisms regulating sink formation of soybean under elevated CO_2 and temperature conditions

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We analyzed physiological mechanisms regulating sink formation of soybean under elevated CO_2 and temperature conditions, with emphasis placed on the capacity of nitrogen fixation and photosynthesis. Under elevated CO_2 and temperature conditions, nitrogen fixation and photosynthesis were significantly enhanced at the early growth stage, whereas they were depressed at the later growth stage. This elevated CO_2-induced down-regulation was associated with the decreased leaf activity, which was probably due to decreased transpiration, increased leaf temperature and accumulation of photoassimilate in leaves under elevated CO_2 and temperature conditions.