3 - PLB 105 Lab ManualFall 2010 page 3-1 Laboratory 3...

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PLB 105 Lab Manual—Fall 2010 page 3-1 Laboratory 3 Parenchyma and Collenchyma Today begins an investigation of variations among the basic cell types and tissues. There are three types of ground tissue: parenchyma, collenchyma, and sclerenchyma. We will begin with parenchyma and collenchyma. All three types may form simple tissues or may be part of a complex tissue. For example, individual parenchyma cells are common in the complex tissues of xylem and phloem. Ground tissues, particularly parenchyma, are the tissues common in pith and cortex regions of roots and stems, the mesophyll of leaves, and the fleshy and storage portions of fruits and seeds. The table below illustrates the developmental relationships among primary meristems and primary plant tissues. Refer to it throughout the quarter to help in understanding how the cell or tissue under examination fits into the developmental process of the whole organism. Primary Meristematic Mature Primary Primary Tissue Tissues Tissues Systems protoderm epidermis (complex) dermal Shoot and Root parenchyma (simple) Apical ground meristem collenchyma (simple) ground Meristems sclerenchyma (simple) procambium primary xylem (complex) vascular (also called provascular) primary phloem (complex) A. Parenchyma Parenchyma cells come in a variety of shapes, depending upon their functions. Photosynthesis, storage, support, and aeration are typical roles. Parenchyma cells may also redifferentiate to form meristematic cells that subsequently differentiate into other cell types, such as in the initiation of secondary growth in stems. 1. Medicago (alfalfa) stem Cut TS of the stem and stain with toluidine blue. You may have seen prepared slides of this tissue in introductory courses. Look for chlorenchyma (parenchyma containing chloroplasts) and storage parenchyma with starch grains. 2.
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3 - PLB 105 Lab ManualFall 2010 page 3-1 Laboratory 3...

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