1 / 15

Stamen series from leaf-like to a slender filament.

Morphological series. Stamen series from leaf-like to a slender filament. Carpels from leaf-like (conduplicate carpel) to carpels with a highly defined stigma, style and ovary. Basic “ABC Model of Floral Organ Development. Normal wild-type Arabidopsis thaliana (Brassicaceae).

sana
Download Presentation

Stamen series from leaf-like to a slender filament.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Morphological series Stamen series from leaf-like to a slender filament.

  2. Carpels from leaf-like (conduplicate carpel) to carpels with a highly defined stigma, style and ovary.

  3. Basic “ABC Model of Floral Organ Development

  4. Normal wild-type Arabidopsis thaliana (Brassicaceae)

  5. Arabidopsis showing 4 floral organs Carpels-C StamensB&C Petals-A&B Sepals-A

  6. apetala 2 mutant No A(Ca -St-St - Ca)

  7. St St Ca Ca Apetala mutant No A (Ca -St-St - Ca) Wild Type Flower

  8. apetala or pistillata mutant, No B (Se-Se-Ca-Ca)

  9. Side View Top View C- Class Mutants AGAMOUS mutant No Gametes (Se-Pe-Pe-Se-Pe-Pe)

  10. The name of a gene describes the flower when that gene is not functional. A-Class Mutant No APETALA 1 or APETALA2 No Petals (only carpels and stamens) B-Class Mutant APETALA 3 or PISTILLATA No petals or a lot of Pistils

  11. Side View Top View C- Class Mutants AGAMOUS mutant No Gametes (Se-Pe-Pe-Se-Pe-Pe)

  12. The SEPALLATA genes alone cannot direct flower development. If you turn on the SEPALLATA genes in vegetative plants you get petal-like structures where leaves should be, but none of the other flower parts were present. If you turn on the ABC genes without SEPALLATA genes, you also do not get a flower. So BOTH sets of genes are necessary for normal flower development.

  13. Flower structure and the “quartet model” of floral organ specification in Arabidopsis (From Nature409, 469 - 471 (2001)

  14. Ancient Gene ABC plus model Note addition of SEPALLATA genes and others (green, blue and black). Even though it is more complex-- a gene change here or there can have a profound effect on flower phenotype.

More Related