Lecture 13 - Flower development

Lecture 13 - Flower development - Flower development How...

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Unformatted text preview: Flower development How are different flower organs specified? How is the flower meristem made determinate? Flower meristems Shoot apical meristem (SAM) Arabidopsis flower organs 4 sepals 6 stamens 2 carpels (fused) 4 petals A = sepals A + B = petals C = carpels B + C = stamens (Bowman and Meyerowitz, 1991) ABC Model 1 2 3 4 A A 1 2 3 4 B B 1 2 3 4 C C Wild type flower apetala2 = A mutant Sepals replaced by carpels Petals missing or replaced by stamens B Wild type stamen stamen carpel sepal sepal carpel carpel B A C C A petal petal B C C C C B stamen stamen carpel stamen stamen ap2 (A) mutant pistillata = B mutant Stamens replaced by carpels Petals replaced by sepals B A C C A B Wild type B mutant A C C A sepal sepal petal petal stamen stamen carpel sepal sepal sepal sepal carpel carpel carpel agamous = C mutant Stamens are replaced by petals Carpels are replaced by a new flower B A C C A B Wild type C mutant B A A A A B sepal sepal petal petal stamen stamen carpel sepal sepal petal petal petal petal * The C-function gene AGAMOUS is expressed in cells that will form stamens and carpels petal sepal carpel leaf sepal stamen A...
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Lecture 13 - Flower development - Flower development How...

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