Jim Bidlack - BIO 5354/4354 PLANT ANATOMY Lecture 10 - Parenchyma and Collenchyma I. Location and function of parenchyma ("beside" tissue) A. Where it's found 1. Main representative of ground tissue 2. Cortex and pith of stems 3. Cortex of roots 4. Ground tissue of petioles 5. Mesophyll of leaves 6. With xylem and phloem B. What it does 1. Capable of changing function 2. Can go through resumption of meristematic activity to enable a) Wound healing b) Regeneration c) Adventitious roots and shoots d) Grafts e) Tissue culture II. Types of parenchyma A. Chlorenchyma - photosynthetic (found in leaf mesophyll) B. Storage - starch and oil (seeds and fruits); have amyloplasts, chromoplasts, and accumulate stuff in vacuole (anthocyanins, tannins, crystals) C. Aerenchyma - have intercellular air spaces (stem, petiole, midrib) D. Sclerified - have primary and secondary walls (some seeds; asparagus and persimmon) 1. Secondary wall is thinner than that of sclerenchyma and is composed of cellulose and lignin 2. Sclerified parenchyma are alive.
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