L12 Plant Cells I

L12 Plant Cells I - 1. SecondaryGrowth:Chapter5 2. 3. 4. 5....

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Review Lecture 11 1. Secondary Growth: Chapter 5 2. Vascular Cambium 3. Cork Cambium 4. Bark 5. Fusiform and Ray Initials 6. Growth Patterns 7. Different Woods
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Secondary Growth 1. Defined as an increase in girth initiated by cell  divisions in lateral meristems 2. Occurs in woody plants: all gymnosperms, 20%  of dicots and 5% of monocots 3. Occurs in stems and roots after they are no  longer growing in length
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Periclinal and Anticlinal Divisions in the vascular cambium Chap.5, pg.107
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Vascular and Cork Cambium make up the  lateral meristems Chap.5, pg.101
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Reaction Wood 1. Develops to counterbalance wind and gravity 2. Dicots form  tension wood : forms on the upper side of leaning  trunks or branches (wider growth rings, less lignin) 3. Conifers form  compression wood : forms on the underside of  trunk or branches (wider growth rings, rich in lignin) 4. Boards containing reaction wood shrink at different rates and  have irregularities in strength and are therefore not usable
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Sapwood and Heartwood 1. Heartwood  is older non-conducting rings of xylem  found in  the centre of the trunk or root (at the heart of the trunk) 2. Sapwood  consist of the outer xylem  rings that still conduct  water and m inerals 1. Heartwood is usually darker but not always 2. In som e tree species antibacterial  and antim icrobial   com pounds are produced by parenchym a cells surrounding  the heartwood protecting heartwood from  rotting
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Bark Consists of all tissues external to the vascular  cambium Chap.5, pg.105
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Insect trapped in fossilized resin (amber) from extinct  conifers near the Baltic Sea  
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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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Lecture 12 Outline 1. Plant Cell Structure: Chap.2 2. Cells and Cell Theory 3. Prokaryotes and Eukaryotes 4. Common Organelles 5. “Signature” Organelles
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Organisms are made up of cells 1. All living organisms are made up of one or more cells 2. Cells are typically 1-300 µm in diameter (1 µm is equal to  1/1000 of a mm) 3. Cells were discovered by Robert Hooke (1635-1703) 4. Hooke used the term “cell” because the tiny compartments  making up the slice of bark reminded him of a monk’s cell 5. “Cell” comes from the Latin, cella, meaning “small room”
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Cell Size Cell size is limited by a need to maintain a surface area that  will allow for exchange of oxygen, water and nutrients  for a given volume
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structures beyond the resolution of the  human eye. Light and electron microscopy is used 
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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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L12 Plant Cells I - 1. SecondaryGrowth:Chapter5 2. 3. 4. 5....

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