Lecture 5 - Leaf Development OUTLINE I. Review of leaf...

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Unformatted text preview: Leaf Development OUTLINE I. Review of leaf morphology and anatomy II. Leaf arrangement or phyllotaxy A. Variations in leaf arrangement B. Developmental control of phyllotaxy III. Development of the simple bifacial leaf A. Initiation B. Early differentiation C. Origin and expansion of the lamina D. Development of the veins IV. Clonal analysis a chimeric leaf with L2 chloroplast mutation Reading Assignment: Wolpert pages 240-243 V. Genes that control adaxial vs. abaxial polarity A. ARP Myb transcription factors B. Class III HD-ZIP homeodo- main transcription factors C. YABBY genes transcription factors VI. Role of the L1 SAM layer in adaxial/adaxial polarity VII. Antagonism between KNOX1 and ARP genes Study Questions for Lecture 17 1. Leaves are the most complex and most morphologically variable of the three vegetative organs in plants. What are the three planes of symmetry in leaves and what are some characteristics that are variable from species to species. 2. How does auxin determine the site of leaf initiation on the apical meristem? 3. What major classes of genes function in establishing the adaxial/abaxial polarity in development leaves? How is this related to lamina formation? 4. What genes and plant hormones are involved in SAM vs. leaf identity and what are the regulatory relationships? Leaf Morphology Leaf Anatomy Leaf polarity/plane of symmetry adaxial adaxial abaxial abaxial proximodistal proximodistal centrolateral centrolateral Leaf Arrangement or Phyllotaxy Fig. 6.18 Fibonacci Number series 1,1, 2, 3, 5, 8, 13, 21, . . . . . . . . . . , 1/3, 2/5, 3/8, 5/13, 8/21, 13/34, . . . . . 180 o , 120 o , 144 o , 135 o , 138.5 o , 137.1 o , 137.6 o , 137.5 o , Fibonacci divergence angle is 137.5 degrees Variations in Phyllotaxy Variations in Spiral decussate (A), (B) Tomato shoot tips treated with NPA to form pins. (C) Normal tomato shoot tip. (D)-(G) Sectioned pins. (H)-(K) Sectioned normal shoot tips. (F), (J) mRNA expression pattern of Class I homeodomain protein (= kn1 , STM )....
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Lecture 5 - Leaf Development OUTLINE I. Review of leaf...

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