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2013BIOAO2 Lecture 06.docx

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Biological Sciences
Ivana Stehlik

2013BIOAO2 S Module 1 th January 7 ~Feb1 2013 th Midterm date: Monday Febuary 4 2013th5-7pm Module 2: Begins on Tuesday Feb 5 . Total: 12 lectures Lecture outline: 1-2: Tree of life-plants 3-4 Plant cells and plant tissues 5-6. From seed to tree 7-8. Freom tree to seed 9. Transport in plants 10. Plant nutrition and soils 11. Plant defense 12. Plant life on the edge. Lecture 6 notes (From seed to tree) B) From primary to secondary plant body ii. Shoot and root primary growth. Primary meristem: Shoot apical meristem & Root apical meristem • Shoot apical meristem tissue from xylem (inside) to epidermis (outside): xylem> vascular cambium> phloem>collenchyma>cortex (made up of parenchyma)>epidermis o E.g sunflower (Helianthus) o From pith(inside) to epidermis: pith>primary xylem>vascular cambium>primary phloem>collenchyma>cortex(parenchyma with some collenchyma)>ground meristem>procambium>protoderm>epidermis. o X-section of shoot is circle and vascular bundles around. • Root apical meristem tissue o During mitotic cell division: procambium>ground meristem>root apical meristem>root cap>protoderm o During differentiation: primary xylem>vascular cambium(replace procambium)>primary phloem>endoderm>periccle>cortex>epidermis with root hair  Main difference between root and shoot: Root has no pith and the vascular cambium is at the centre. Root has endoderm and pericycle.  Endoderm acts as a filter for material from root hair to vascular tissue. o X-section of root is circle a star shaped. • Limited maximum size with primary growth: collenchyma has ligment that strengthen plant for structure. • Primary to secondary growth: the girth(middle) of root/stem is inc
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