Roots and root systems Functions(for plants): 1.Uptake of soil nutrients 2.Uptake of water 3. Storage(e.g. carrots, radish, sugar beet 4 Phytohormone(植物激素) production 5. Habitat for micro-organisms symbiotic N2 fixing bacteria固氮细菌( (internal) mycorrhizal fungi菌根真菌( (internal& externa) rhizosphere根际 bacteria& fungi( external)Roots and root systems Functions (for plants): 1.Uptake of soil nutrients 2.Uptake of water 3.Storage (e.g. carrots, radish, sugar beet) 4.Phytohormone（植物激素） production 5.Habitat for micro-organisms: - symbiotic N2 -fixing bacteria固氮细菌 (internal) - mycorrhizal fungi菌根真菌 (internal & external) - rhizosphere根际 bacteria & fungi (external)