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Flowering Time Flower Meristem Identity Flower Organ Identity Fruit Development FT APETALA1, LEAFY, CAULIFLOWER, (TERMINAL FLOWER) A, B, C FRUITFULL,

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Presentation on theme: "Flowering Time Flower Meristem Identity Flower Organ Identity Fruit Development FT APETALA1, LEAFY, CAULIFLOWER, (TERMINAL FLOWER) A, B, C FRUITFULL,"— Presentation transcript:

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2 Flowering Time Flower Meristem Identity Flower Organ Identity Fruit Development FT APETALA1, LEAFY, CAULIFLOWER, (TERMINAL FLOWER) A, B, C FRUITFULL, SHATTERPROOF INDEHISCENT

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4 B ACCA B carpel petal stamen sepal

5 normal flower

6 sepal petal stamen carpel B B ACCA What gene prevents the B gene from being active in the center of flowers?

7 In SUPERMAN mutants (SUP), the B activity expands into the center of the flower and converts the two carpels into two stamens. ACCA BB stamen sepal petal stamen

8 Superman mutant

9 The SUPERMAN gene normally functions to prevent B gene activity in the center of flowers ACCA BB stamen sepal petal stamen

10 normal BC mutant ?? sepal petal stamen carpel B B ACCA AAAA

11 normal BC mutant sepal petal stamen carpel B B ACCA AAAA sepal *

12 BC double mutant all organs are sepals

13 sepal petal stamen carpel B B ACCA What happens if the A, B and C genes are all inactivated in the ABC triple mutant?

14 normal ABC mutant ?? sepal petal stamen carpel B B ACCA

15 ABC mutant leaf * normal sepal petal stamen carpel B B ACCA

16 ABC triple mutant all organs are leaves

17 Goethe believed that floral organs are derived from leaves Goethe, 1790

18 The C gene is active in cells that will form stamens and carpels petal sepal carpel leaf sepal stamen

19 What would happen if the C gene was mis-expressed in cells that would normally form sepals? petal sepal carpel leaf sepal stamen

20 B normal stamen carpel sepal B ACCA petal

21 Regulatory region stamens and carpels C GENE Coding Region sepals Add sepal regulatory region: Remove regulatory region:

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25 Flowering Time Flower Meristem Identity Flower Organ Identity Fruit Development FT APETALA1, LEAFY, CAULIFLOWER, (TERMINAL FLOWER) A, B, C FRUITFULL, SHATTERPROOF INDEHISCENT


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