Lecture 6 - Meristems Root Apical Meristem OUTLINE I. II....

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Meristems – Root Apical Meristem OUTLINE I. General Organization of the Root Tip II. Histology of the Root Tip A. Lower Vascular Plants B. Flowering Plants I. Methods of Study A. Korper-Kappe (body-cap) B. Cell Cycle – Quiescent Center C. Localization of Cell Division Activity D. Localization of the PIN proteins and Auxin Transport E. Radial Development short root and scarecrow mutants Clavata3 signaling Reading Assignment : Wolpert. Pgs 243-245
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Study Questions for Lecture 18 1 . What are the three zones of longitudinal development in root tips? How is this polar growth pattern controlled developmentally? 2. What are “T” divisions? How are they important in radial development of root tips? Describe the gene regulatory pathway that controls the “T” division that gives rise to the cortex and endodermis in roots of Arabidopsis ? 3. What is the quiescent center and how is it similar to the central mother cell zone in the shoot apical meristem? What controls its position?
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Lower vascular plant with a single apical cell in the root apical meristem (RAM) Apical cell The apical cell produces cells bidirectionlly because it is the source of both the root and the root cap.
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Transverse cell division Seed plants have more complex root apical meristems. Cell lineages can be followed to their point of origin in the RAM. Cell divisions that lay down their new cell plate perpendicular to the long axis of the root just increase the length of cell files (as shown
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Lecture 6 - Meristems Root Apical Meristem OUTLINE I. II....

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