Il.Plants as Microbial Habitats 2.The Legume-Root Nodule Symbiosis 3.Agrobacterium and Crown Gall Disease ©4.Mycorrhizae 10 Microbiology,Shanghai Jiao Tong University10 Microbiology, Shanghai Jiao Tong University II. Plants as Microbial Habitats 2. The Legume–Root Nodule Symbiosis 3. Agrobacterium and Crown Gall Disease 4. Mycorrhizae