BIOL 1011 Lecture Notes - Lecture 5: Cork Cambium, Vascular Cambium, Woody Plant

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Readings: chapters 36. 5 - end, and 10: secondary growth. Produces wood and bark and occurs in conifers and woody eudicots. Lateral meristems are responsible for secondary growth such as vascular cambium and cork cambium. The cork cambium adds secondary dermal tissue. The vascular cambium adds secondary xylem and phloem. Produces: secondary xylem to inside (wood, secondary phloem to outside, more vc (to increase in circumference, rays - parenchyma for lateral transport (not (tangential view - top view) Fusiform initials make tracheids and vessel elements (xylem) and sieve elements. Ray initials make rays (in both xylem and phloem) Lignin (polymer) in secondary walls of tracheids and vessel elements. Class of complex organic polymers (not a polysaccharide) 2nd most abundant natural polymer, after cellulose. Deposited in cell walls; lls spaces and bind cellulose, hemicellulose & pectin. Can occur in cell walls of non-woody plants (palm trees, bamboo, wheat straw ) Paper - lignin removed to leave cellulose.

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