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Federico D. ARIEL 2014 (Coen, 1996) Gene expression regulation in plants.

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Presentation on theme: "Federico D. ARIEL 2014 (Coen, 1996) Gene expression regulation in plants."— Presentation transcript:

1 Federico D. ARIEL 2014 (Coen, 1996) Gene expression regulation in plants

2 Animal embryogenesis

3 Plant embryogenesis and post embryonic development

4 The shoot apical meristem (SAM)

5 First steps of plant development

6 WUSCHEL maintains the SAM The shoot apical meristem

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12 Epigenetic regulation of FLC

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14 Mayor floral inductive pathways

15 Flower organs are organized in whorls 1.Sepals 2.Petals 3.Stamens 4.Carpels

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17 Sepals Activity A Petals Act. A + B Stamens Act. B + C Carpels Activity C Act. AAct. C ABCE model The war of the whorls: genetic interactions controlling flower development Enrico S. Coen & Elliot M. Meyerowitz (1996)

18 The ABCE Model Activity A: APETALA1 (AP1); APETALA2 (AP2) Activity B: APETALA3 (AP3); PISTILLATA (PI) Activity C: AGAMOUS (AG) Activity E: SEPALLATA (SEP) LEAFY +

19 AP1 + FT AP3 + UFO AG + WUS (A) Whorls 1 y 2 (B) Whorls 2 y 3 (C) Whorls 3 y 4

20 1 2 3 4

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22 Homeosis in animals and in plants

23 1. Predict the phenotype of the following mutant plants: a) agamous (AG) b) apetala2 (AP2) c) pistillata (PI) d) agamous – apetala2 e) agamous – apetala2 – apetala3 Some exercises 2. What phenotype would result from the transformation of Arabidopsis plants with the construct PromLFY::miRNA172? 3. What phenotype would result from the transformation of Arabidopsis plants with the construct PromAG::UFO?

24 Phenotypes predicted by the ABCE model

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26 When Actvivity C is abolished, the meristem persists…

27 LEAFY AP1 + FT AP3 and PI + UFO AG + WUS (A) Whorls 1 y 2 (B) Whorls 2 y 3 (C) Whorls 3 y 4 WUSCHEL is also expressed in whorls 1, 2 y 3

28 Relation between WUSCHEL and AGAMOUS WUSCHEL  Activity C Flowers with Sepals and Petals The mersitem persists and WUSCHEL remains expressed agamous

29 WUSCHEL-AGAMOUS Summing up: WUSCHEL AGAMOUS - WUSCHEL AGAMOUS + When AGAMOUS respresses WUSCHEL, the meristematic cells differenciate to generate the Carpels

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31 Role of non-coding RNAs in plants

32 What are the non-coding RNAs?


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