Regulation of Floral-Organ- Type by SUPERMAN
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1 Regulation of Floral-Organ- Type by SUPERMAN 1. Need for regulators of the organ-identity genes. 2. The Superman mutant phenotype-predicting the role of SUPERMAN. 3. Testing our hypothesis of the role of SUPERMAN.
2 Superman Floral Phenotype Wild-type Flower Superman Flower
3 Superman Floral Phenotype SEM
4 Structure of wild type and mutant Arabidopsis flowers Whorl 1 Whorl 2 Whorl 3 Whorl 4 WT SEPAL PETAL STAMEN CARPEL Ag SEPAL PETAL PETAL SEPAL/ Pi or SEPAL SEPAL CARPEL CARPEL Ap3 Sup SEPAL PETAL STAMEN STAMEN Sup/ Pi or Ap3 Sup/ Ag
5 A Model For Control of Organ Type: Sup Mutant sepal petal stamen carpel B (AP3, PI) PI) A (AP1, AP2) C (AG)
6 Structure of wild type and mutant Arabidopsis flowers Whorl 1 Whorl 2 Whorl 3 Whorl 4 WT SEPAL PETAL STAMEN CARPEL Ag SEPAL PETAL PETAL SEPAL/ Pi or SEPAL SEPAL CARPEL CARPEL Ap3 Sup SEPAL PETAL STAMEN STAMEN Sup/ E Pi or Ap3 O Sup/ E Ag O
7 A Model For Control of Organ Type: Sup Mutant sepal petal stamen carpel B (AP3, PI) PI) A (AP1, AP2) C (AG)
8 Structure of wild type and mutant Arabidopsis flowers Whorl 1 Whorl 2 Whorl 3 Whorl 4 WT SEPAL PETAL STAMEN CARPEL Ag SEPAL PETAL PETAL SEPAL/ Pi or SEPAL SEPAL CARPEL CARPEL Ap3 Sup SEPAL PETAL STAMEN STAMEN Sup/ E Pi or Ap3 O Sup/ E Ag O SEPAL SEPAL CARPEL CARPEL
9 Sup, Pi Double Mutant Flower Pi Pi, Sup
10 Structure of wild type and mutant Arabidopsis flowers Whorl 1 Whorl 2 Whorl 3 Whorl 4 WT SEPAL PETAL STAMEN CARPEL Ag SEPAL PETAL PETAL SEPAL/ Pi or SEPAL SEPAL CARPEL CARPEL Ap3 Sup Sup/ E Pi or O Ap3 SEPAL PETAL STAMEN STAMEN SEPAL SEPAL CARPEL CARPEL SEPAL SEPAL CARPEL CARPEL Sup/ E Ag O
11 A Model For Control of Organ Type: Sup Mutant sepal petal stamen carpel B (AP3, PI) PI) A (AP1, AP2) C (AG)
12 Structure of wild type and mutant Arabidopsis flowers Whorl 1 Whorl 2 Whorl 3 Whorl 4 WT SEPAL PETAL STAMEN CARPEL Ag SEPAL PETAL PETAL SEPAL/ Pi or SEPAL SEPAL CARPEL CARPEL Ap3 Sup Sup/ E Pi or O Ap3 Sup/ E Ag O SEPAL PETAL STAMEN STAMEN SEPAL SEPAL CARPEL CARPEL SEPAL SEPAL CARPEL CARPEL SEPAL PETAL PETAL PETAL
13 Sup, Ag Mutant Phenotype Ag Sup, Ag
14 Structure of wild type and mutant Arabidopsis flowers Whorl 1 Whorl 2 Whorl 3 Whorl 4 WT SEPAL PETAL STAMEN CARPEL Ag SEPAL PETAL PETAL SEPAL/ Pi or SEPAL SEPAL CARPEL CARPEL Ap3 Sup Sup/ E Pi or O Ap3 Sup/ E Ag O SEPAL PETAL STAMEN STAMEN SEPAL SEPAL CARPEL CARPEL SEPAL SEPAL CARPEL CARPEL SEPAL PETAL PETAL PETAL SEPAL PETAL PETAL PETAL
15 A Model For Control of Organ Type: Sup Mutant sepal petal stamen carpel B (AP3, PI) PI) A (AP1, AP2) C (AG) AP3 expression?
16 AP3 Expression in the Sup Mutant Wild-type Superman
17 SUP gene Cloned (by position) SUP encodes a transcription factor. Where is SUP expressed?
18 A Model For Control of Organ Type: Sup Mutant sepal petal stamen carpel B (AP3, PI) PI) A (AP1, AP2) C (AG)
19 SUPERMAN Expression
20 A Model For Control of Organ Type: SUP Expression sepal petal stamen carpel B (AP3, PI) A (AP1, AP2) C (AG)
21 A Model For Control of Organ Type: Sup Mutant When SUPERMAN is expressed ectopically using the AP1 promoter all floral organs are reduced or absent. SUPERMAN is also expressed in the ovule integuments and in the Sup mutant the integuments grow too much.
22 A Model For Control of Organ Type: SUP Expression sepal petal stamen carpel B (AP3, PI) A (AP1, AP2) C (AG)
23 The SUPERMAN expression pattern is inside of but overlaps that of AP3 Prunet, et al. PNAS :
24 A Model For Control of Organ Type: SUP Expression sepal petal stamen carpel B (AP3, PI) A (AP1, AP2) C (AG)
25 A Model For Control of Organ Type: Sup Mutant Superman is believed to suppress AP3 gene expression and inhibit the growth of cells the growth of cells on the outer edge of the fourth whorl to produce a sharp B/C C boundary.
26 Control of floral organ identity Reading assignment Coen, E.S. and E.M. Meyerowitz The war of the whorls: genetic interactions controlling flower development. Nature 353: Ma, H The unfolding drama of flower development: recent results from genetic and molecular analyses. Genes and Dev. 8: Goto K., Kyozuka J., Bowman J.L Turning floral organs into leaves, leaves into floral organs. Curr Opin Genet Dev. 11: Westhoff et al. Molecular Plant Development:from gene to plant. Chapter 6, Prunet N, W Yang, P Das, EM Meyerowitz, Thomas P Jack SUPERMAN prevents stamen formation and promotes stem cell termination in the fourth whorl of the Arabidopsis flower. In press.
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