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ROOT SYSTEM

ROOT SYSTEM. ROOT IS AN underground cylindrical part of the plant which develops from radicle and grows vertically downward into the soil. characteristics. Roots are cylindrical structures. Root is positively geotropic. Buds and leaves are absent.

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ROOT SYSTEM

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  1. ROOT SYSTEM • ROOT IS AN underground cylindrical part of the plant which develops from radicle and grows vertically downward into the soil.

  2. characteristics • Roots are cylindrical structures. • Root is positively geotropic. • Buds and leaves are absent. • Root is colourless due to absence of chlorophyll. • Root cap is present over the apex.

  3. Third Chapter Plant OrgansSection One Roots Organ Ones that are formed by many kinds of tissues , having certain external shape and inside structure and plant body component of carrying out certain physiological function .(review tissue) vegetative organ (root ,stem ,leaf) Organ reproductive organ(flower ,fruit ,seed)

  4. Tissue The source similar to the function is the same , shape structure and the cell group contacting each other closely is called the tissue. Vegetative organ : Absorb playing , make and supply the body nutriment function of the plant , making the plant body grow , development with. Including theroot , stem , leaf. Reproductive organ :Play a role in breed the later generation and extend ethnicallying. Including the flower , fruit , seed.

  5. absorb function transportation supportion Physiological function breeding preservation assimilation function Medicinal value

  6. Radix Notoginseng Radix Ginseng Radix Astragali Radix Ophiopogonis

  7. Part One Forms and Types of Roots ★Forms of Roots ★ Root Types 1 Main root and lateral root Normal root and adventitious root Types of Root system tap root system and fibrous root system

  8. Abnormal root storage root fleshy tap root root tuber prop root aerial root climbing root water root parasitic root

  9. 1. Coniform root 2. columniform～ 3. pelletly～ 4. Spindly root tuber 5. nubby root tuber

  10. 1.Prop root 2.aerial root 3.climbing root 4.5.parasitic root

  11. Part Two Inner Structure of Roots Basic Structure of the Root Tip Root cap Region of Division Region of Elongation Region of Maturation

  12. Basic Structure of the Root Tip 1.Maturation zone 2.Elongation zone 3.Meristematic zone 4.Root cap

  13. Primary Structure Epidermis exodermis Cortexcortex parenchyma endodermis casparian dots passage cell

  14. Primary Structure of Dicotyledon Radicle 1.Epidermis 2.Cortex 3.Endodermis 4.Pericycle 5.Protoxylem 6.Metaxylem 7.Primary phloem 8.Immature metaxylem

  15. Ⅰ.solid view of endodermis cells（ show casparian strip ） Ⅱ.transverse section view of endodermis cells（show casparian dots） 1.Cortex cell 2.endodermis 3.casparian strip 4.pericycle

  16. Passage cell Casparian dots or casprian strip

  17. Vascular cylinderpericycle primary xylem (diarch , triarch , tetrarch,hexarch,polyarch,etc) primary phloem ☆Definition: Exarch: The order of differentiation and maturation of primary xylem of root is from the outside to inside, and is known as exarch.

  18. Formation of Lateral Root Transverse section of horsebean root 1、endodermis 2、pericycle

  19. Formation of lateral root

  20. Secondary Structure of Roots ①Origin and Activities of the Vascular Cambium Cambiumsecondary phloem secondary xylem

  21. Ⅰ.radicle（dot and line show beginning place of cambium） Ⅱ.cambium becomes consecutive tissue Ⅲ.whole cambium make secondary structure Ⅳ.cambium becomes a ring 1.Primary xylem 2.primary phloem 3.cambium 4. secondary xylem5.secondary phloem

  22. The transverse section of MaDouLing Ⅰ.（1.phellem 2.phellogen 3.cortex 4starch grain 5.secretory cell） Ⅱ.（1.phloem 2.sieve tube gang 3.cambium 4.ray 5.xylem） Ⅲ.（1.xylem 2.ray）

  23. Secondary structure of root

  24. ②Origin and Activities of the Cork Cambium Phellogen phellem phelloderm Periderm and lenticel 1.Origination of phellogen 2.epidermis 3.phellogen 4.phellem 5.phelloderm 6.cortex parenchyma 7.supplementary cell

  25. Anomalous Structure the model sketch of root anomalous structure Ⅰ.shanglu root Ⅱ.niuxi root Ⅲ.chuanniuxi root Ⅳ.heshouwu root 1.Phellem 2.Cortex 3.Phloem 4.Cambium 5.xylem

  26. Symbiosis PhenomenonRoot Nodule and Mycorrhiza

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