Chapter 19 Study Questions 1. Discuss some of the genetic interactions required

Question

Chapter 19 Study Questions 1. Discuss some of the genetic interactions required for the establishment of adaxial/abaxial polarity and blade outgrowth in developing leaves. Textbook Reference: The Establishment of Leaf Polarity, pp. 554-559 2. Discuss the role of KNOX1 in compound leaf formation Textbook Reference: The Establishment of Leaf Polarity, pp. 559-560 3. Describe the genetic control of patterning for either stomata or trichomes. Textbook Reference: Differentiation of Epidermal Cell Types, pp. 562-565 4. Discuss the role of auxin and auxin transporters in the formation of the primary vascular system of stems and the venation pattern of leaves. Textbook Reference: Venation Patterns in Leaves, pp. 566-572 5. Describe the interactions of hormones and sucrose in the regulation of axillary bud growth in stems Textbook Reference: Shoot Branching and Architecture, pp. 573-577 6. How does root system architecture change in response to phosphorus deficiency? Textbook Reference: Root System Architecture, pp. 580-583

Explanation / Answer

Leaves of flowering plants are diverse in shape.It maybe due to spatiotemporal regulation of polarity between adaxial and abaxial surfaces of the leaves. In the leaf primodium antagonistic interactions between leaf primodium specifu the domains in a mutually exclusive manner

KNOX1 STM gene shootmeristemless are involved in leaf shape control during angiosperm evolution. It acts antagonistically with the ARP gene to control induction of leaf primodia. Loss of funtion of stm in a mutuant prevents leaf formation.

Stomata are epidermal pores used for exchange of water ,oxygen and carbon dioxide,stomata is arranged with guard cells and this is called as the stomatal complex.They are regulated by a large number of genetic components such as secreted peptide ligandds,plasma membrane recpetors and receptrs like kinases,MAP kinase module and transcription factors.

Auxins are one of the first hormones to be intenfied in plants it is called indole 3 acetic acid, it is present in plants in different proportions. It is transported by a transport system called polar auxin transport.

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