9 - PLB 105 Lab ManualFall 2010 page 9-1 Laboratory 9...

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PLB 105 Lab Manual—Fall 2010 page 9-1 Laboratory 9 Specialized Roots, Root-like Organs, and Mature Primary Roots A. Rootlike Organs and Specialized Roots 1. Iris rhizome—living material These are underground stems which perform the functions of roots. Cut a freehand section. Do you see any characteristics of roots? Stems? Rhizomes frequently have an intermediate organization of tissues. 2. Myriophyllum rhizome—prepared demo slide Examine the prepared demonstration slide of the rhizome and look for Casparian strips. How does the organization of this rhizome and stem compare with that of Iris . 3. Zebrina (Wandering Jew) stem—living material Cut TS of stem tissue at a node to include a median longitudinal section through one or more adventitious roots. Stain and determine the point of vascular connection, if possible. Does the root have typical root anatomy? Other examples of adventitious roots, such as Ficus pumila , Monstera deliciosa , and Hedera helix, are on demonstration for macroscopic inspection. 4.
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9 - PLB 105 Lab ManualFall 2010 page 9-1 Laboratory 9...

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