菌根,就是土壤中真菌与根的木栓化幼嫩部分形成的共生联合体.形成菌根的真菌叫做菌根菌.菌根能促进寄主的生长,在有效磷低的土壤中,它能成倍地促进植物的生长.菌根有两种类型:一种叫外生型菌根.真菌的菌丝包在幼根的外面或侵入皮层细胞的间隙中,使根毛不发达,甚至没有而被菌丝所代替.如松、山毛榉、麻栎等;另一种叫内生型菌根.菌丝穿过细胞壁侵入细胞内,并同细胞原生质体混在一起,在表皮细 Mycorrhizal, is the symbiotic association of fungi in the soil and the young part of the tree that corks. The mycorrhizal fungus is called mycorrhizal fungi. Mycorrhiza can promote the growth of the host, in the soil with low available phosphorus, it can Multiplied to promote the growth of plants There are two types of mycorrhizal: one is called ectomycorrhizal fungi mycelium wrapped in the outside of the root or invaded cortical cells in the gap, so that the root hair is not developed, or even without Was replaced by mycelium, such as pine, beech, oak, etc .; the other is called endogenous mycelium. Hyphae invade cells through the cell wall and cell protoplasts mixed together in the epidermal thin