Roots: a dynamic system Width not to scale -Root Epidermal and cortical cells lysed and invaded by bacteria Micro-organisms with microbial and plant mucilages spreading into the sor Cells dividing expanding Sloughed root cap celis Root cap
Roots: a dynamic system Cells dividing & expanding Width not to scale
Roots: a dynamic system -Root Epidermal and cortical cells lysed and invaded by bacteria Main sites of uptake of nutrients& water(根 Micro-organisms with m crobial and 毛区) plant mucilages Cells dividing spreading into the so or meristem expanding or elongation Sloughed root cap celis zne分生区 Root cap 与伸长区
Roots: a dynamic system Main sites of uptake of nutrients & water（根 毛区） Cells dividing or meristem & expanding or elongation zone分生区 与伸长区
Roots and root systems Functions(for plants): Uptake of soil nutrients Uptake of water Storage(e.g. carrots, radish, sugar beet) Phytohormone production Habitat for micro-organisms Anchorage support Many specialised root-ty pes, e.g. aerial roots(from stems or branches) contractile roots(anchor seedlings) cluster roots
Roots and root systems Functions (for plants): • Uptake of soil nutrients • Uptake of water • Storage (e.g. carrots, radish, sugar beet) • Phytohormone production • Habitat for micro-organisms • Anchorage & support Many specialised root-types, e.g. - aerial roots (from stems or branches) - contractile roots (anchor seedlings) - cluster roots
Roots and root systems Functions(for soil ecosystem): Structural stability
Roots and root systems Functions (for soil & ecosystem): • Structural stability
军 Cluster roots簇状根系 套 素学 Lupinus albus Hakea哈克木属 undulata Proteaceae Casuarina木麻黄 属 equisetifolia Banksia拔克西木属 burdett Casuarinaceae Proteaceae
Lupinus albus Hakea哈克木属 undulata Proteaceae Casuarina 木麻黄 属equisetifolia Casuarinaceae Banksia拔克西木属 burdetti Proteaceae Cluster roots簇状根系