Lecture 10 PA

Lecture 10 PA - Lecture 10, Chapter 10: Xylem Cell Types...

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Lecture 10, Chapter 10: Xylem Cell Types 1.) Overview Introduction Cell types o Tracheary Elements Tracheids and vessel elements Perforation plates Secondary walls and pitting Water conduction o Fibers o Parenchyma Phylogenetic patterns Primary xylem T.E. Cell Differentiation See: http://www.sbs.utexas.edu/mauseth/weblab 2.) Xylem introduction o Xylem is a complex tissue (more than one cell type) o Makes up one of the two essential components of vascular tissue. o Conducts water and dissolved minerals and other nutrients apoplastically. o Many (but not all) of xylem tissue cells are dead at their functioning state. o Primary xylem is made up of the first formed protoxylem (small) and the later formed metaxylem (large) which also differ in secondary wall patterning. 3.) Xylem Cell Types: Table 10.1 o See table 10.1 in book 4.) Tracheary Elements o “Tracherary elements” is the generic term for any type of cell that runs up and down and carries water. Generic term for both types of cells that conduct water in vascular plants. Use this when you don’t know if it is a tracheid or vessel element. o Are dead and empty at their functioning state and are more or less elongate. o Have lignified secondary walls deposited in various patterns. o
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Lecture 10 PA - Lecture 10, Chapter 10: Xylem Cell Types...

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