L10 The Epidermis

L10 The Epidermis - 1. 2. 3. 4. 5. 6. 7....

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Review of Lecture 9 1. Plant Tissues: Chapter 3 2. Meristems 3. Initials and Derivatives 4. The Three Tissue Systems 5. Dermal Tissues 6. Ground Tissues 7. Vascular Tissues
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Plant Meristems 1. Initials  divide giving rise to two daughter cells  1. One daughter cell replenishes the pool of cells in  the meristem 2. The second daughter cell, called a  derivative leaves the meristem and goes on to differentiate  and contribute to the tissues making up the plant  body
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Chap.3, pg.59
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Ground Tissue System 1. Consists of all of the tissues other than the dermal or vascular  tissue 2. Includes three simple tissues (parenchyma, collenchyma and  sclerenchyma) 3. Often carry out photosynthesis and storage 4. Space filling tissue (occupies areas between dermal and  vascular tissues) where it is known as the  cortex 5. Inside the vascular cylinder it is called pith
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Vascular Tissue System   1. Continuous system of tissues that conduct water,  minerals and organic molecules 2. Made up of two complex tissues ( xylem and phloem ) 3. Xylem conducts water 4. Phloem conducts food
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Xylem: Tracheids 1. Tracheids are long tapered  cells found in all  vascular  plants 2. Tracheids are stacked and  have “bordered pits” allowing  for movement of water and  minerals 3. Dead at maturity Chap.3, pg.54
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Vessel Elements Chap.3, pg.57 Allows water to  flow with less  resistance while  still offering  structural  support
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Phloem: Two main cell types 1. Sieve-tube members (elements) are highly modified  enucleate cells that are alive at maturity 2. Companion cells are derived from the same  parenchyma cells as the sieve-tube members, have nuclei  and provide important housekeeping functions 1. Parenchyma and fiber cells are also associated with  phloem tissue
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The challenges 1. Harvesting light energy 2. Staying wet when things get dry 3. Dealing with gravity 4. Divide or be conquered  5. Leveraging resources
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Evolutionary Innovations The Epiderm is EARTH
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Lecture 10 Outline 1. The Plant Epidermis 2. Functions 3. Development 4. Cell Types and their functions 5. The Epidermal Cuticle 6. Using Genetics to understand function
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The Plant Epidermis   1. Serves as a Filter 2. Functions as a Barrier
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The Plant Epidermis 1. Colonization of terrestrial environment required  mechanisms for regulating water status 2. Modifications to the epidermis played a critical  role in achieving colonization 3. Fossil records show that the very earliest  terrestrial plants had some of these modifications 
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This note was uploaded on 12/23/2010 for the course BIOL 120 taught by Professor Chuong during the Spring '09 term at Waterloo.

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L10 The Epidermis - 1. 2. 3. 4. 5. 6. 7....

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