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一、根瘤的结构与功能根瘤是根瘤细菌与豆科植物共生固氮的组织,着生在植物根部,大小及形状随植物种类而异.按颜色来分,根瘤有红色与非红色(青色或灰色)两种,前者为有效的,后者为无效的.有效根瘤多分布在植株主根和支根的上部,一般只有少数几个.根瘤的形成过程是,生活在土壤中的根瘤细菌,在适宜的豆科植物根分泌物的引诱下,向根部移动,侵入根细胞,取得营养而迅速繁殖,并在根细胞影响下变为类菌体,此后即停止繁殖并失去合成蛋白质的能力,开始固氮.
First, the structure and function of nodules Nodules is a symbiotic nitrogen fixation of nodules bacteria and leguminous plants, was born in the plant roots, size and shape with the plant species vary by color, the nodules are red and non-red (cyan or gray ), The former is effective, the latter is invalid.Effective nodules are mostly distributed in the upper part of the main roots and branching plants, there are only a few.Nodules are formed, the nodules living in the soil, in the appropriate Under the influence of the root cells, it becomes bacteriophores under the inducement of root exudates of legumes, moves to the root, invades the root cells, gains nutrition and then stops multiplying and loses the ability to synthesize proteins and starts nitrogen fixation .