Topic 1.3

Topic 1.3 - Plant Physiology Online: Plant Tissue Systems:...

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Plant Physiology Online: Plant Tissue Systems: Dermal, Ground, and Vascular A Companion to Plant Physiology, Fourth Edition by Lincoln Taiz and Eduardo Zeiger Topics Essays Study Questions Readings Help Select Chapter: Search HOME :: CHAPTER 1 :: Topic 1.3 PREVIOUS :: NEXT Topic 1.3 Plant Tissue Systems: Dermal, Ground, and Vascular Dermal tissue. The epidermis is the dermal tissue of young plants undergoing primary growth (see textbook Figure 1.3). It is generally composed of specialized, flattened polygonal cells that occur on all plant surfaces. Shoot surfaces are usually coated with a waxy cuticle to prevent water loss and are often covered with hairs, or trichomes, which are epidermal cell extensions. Pairs of specialized epidermal cells, the guard cells , are found surrounding microscopic pores in all leaves (see textbook Figure 1.3A). The guard cells and pores are called stomata (singular stoma), and they permit gas exchange (water loss, CO 2 uptake, and O 2 release or uptake) between the atmosphere and the interior of the leaf. The root epidermis is adapted for absorption of water and minerals, and its outer wall surface typically does not have a waxy cuticle. Extensions from the root epidermal cells, the root hairs , increase the surface area over which absorption can take place (see textbook Figure 1.3C). Ground tissue. Making up the bulk of the plant are cells termed the ground tissue. There are three types of ground tissue: parenchyma, collenchyma, and sclerenchyma. Parenchyma , the most abundant ground tissue, consists of thin-walled, metabolically active cells that carry out a variety of functions in the plant including photosynthesis and storage (see textbook Figure 1.3B) Collenchyma tissue is composed of narrow, elongated cells with thick primary walls (see textbook
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This note was uploaded on 08/28/2009 for the course BIO 430 taught by Professor Dr.cohen during the Fall '09 term at Kentucky.

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Topic 1.3 - Plant Physiology Online: Plant Tissue Systems:...

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