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10 - PLB 105 Lab ManualFall 2010 page 10-1 Laboratory 10...

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PLB 105 Lab Manual—Fall 2010 page 10-1 Laboratory 10 Root Secondary Growth and Anomalous Secondary Growth in Roots Today you will examine the sequential development of secondary growth in several different species. Look for similarities and differences in the stages of secondary growth among these roots. In addition, you will examine roots with atypical secondary growth. A. Initiation and Development of Secondary Growth in Roots 1. Glycine max (soybean) root—prepared slide Each prepared slide has three stages of development: immature growth, early secondary growth, and established secondary growth. Note the pattern of vascular tissues at each stage, including the status of the pericycle and the endodermis. Trace the origin and development of the vascular cambium and its products, secondary xylem and secondary phloem. What happens to the primary phloem and the epidermis during secondary development? 2. Convolvulus (morning glory) root—prepared slide Each slide contains several sections. Examine each section starting at the top left of the slide with the youngest section and work along to the older sections.
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