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Unformatted text preview: PLB 105 Lab Manual—Fall 2010 page 11-1 Laboratory 11 Anomalous Secondary Growth in Roots and Shoot Tip Organization Today you will examine roots with atypical secondary growth. You will also begin your study of shoots and stems by dissecting living shoot tips to see the three-dimensional organization of the shoot apical meristem. A. Anomalous Secondary Growth in Roots 1. Daucus (carrot) root—living material Make TS and stain with toluidine blue. Find the position of the vascular cambium, and name the cell types on both sides of it. Carrot is interesting because of the large amount of secondary parenchyma produced by the vascular cambium. 2. Beta (sugar beet) root—living material Make TS and stain with toluidine blue. These roots have concentric rings of successive cambia, each producing discrete secondary vascular bundles and secondary parenchyma. Section both a very young root and an older root. Also examine the parenchyma....
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This document was uploaded on 11/03/2010.
- Fall '08