依赖共生固氮的大豆植株,从其共生固氮作用一开始,便在体内贮藏和运输一种重要含氮有机物——酰脲(尿囊酸+尿囊素)。它广泛分布在植株的根、茎、叶、荚等部位,其含量随根瘤的形成而开始合成,并与根瘤的固氮活性成正比。在苗期含量较低,在绿荚期达最大值,然后下降,在种子中没有酰脲。酰脲在共生固氮的大豆植株生长发 Soybean plants that rely on symbiotic nitrogen fixation initially store and transport an important nitrogen-containing organism, ureide (allantoic acid + allantoin), in vivo, starting from its symbiotic nitrogen fixation. It is widely distributed in the roots, stems, leaves, pods and other parts of the plant, its content with the formation of nodules began to synthesize, and is proportional to the nodulation of nitrogen fixation. At seedling stage the content is low, reaches the maximum at podding stage and then decreases without the presence of ureide in the seed. The ureide grows in symbiotic nitrogen-fixing soybean plants