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Federico D. ARIEL 2014 (Coen, 1996) Gene expression regulation in plants
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Animal embryogenesis
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Plant embryogenesis and post embryonic development
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The shoot apical meristem (SAM)
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First steps of plant development
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WUSCHEL maintains the SAM The shoot apical meristem
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Epigenetic regulation of FLC
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Mayor floral inductive pathways
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Flower organs are organized in whorls 1.Sepals 2.Petals 3.Stamens 4.Carpels
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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)
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The ABCE Model Activity A: APETALA1 (AP1); APETALA2 (AP2) Activity B: APETALA3 (AP3); PISTILLATA (PI) Activity C: AGAMOUS (AG) Activity E: SEPALLATA (SEP) LEAFY +
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AP1 + FT AP3 + UFO AG + WUS (A) Whorls 1 y 2 (B) Whorls 2 y 3 (C) Whorls 3 y 4
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1 2 3 4
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Homeosis in animals and in plants
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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?
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Phenotypes predicted by the ABCE model
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When Actvivity C is abolished, the meristem persists…
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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
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Relation between WUSCHEL and AGAMOUS WUSCHEL Activity C Flowers with Sepals and Petals The mersitem persists and WUSCHEL remains expressed agamous
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WUSCHEL-AGAMOUS Summing up: WUSCHEL AGAMOUS - WUSCHEL AGAMOUS + When AGAMOUS respresses WUSCHEL, the meristematic cells differenciate to generate the Carpels
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Role of non-coding RNAs in plants
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What are the non-coding RNAs?
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