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Plant Development How does plant development differ from animal development? Where do the various parts of a plant come from?
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= hemicellulose Plant Cell Wall
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Cellulose microfibrils in cell wall Microtubules beneath plasma membrane
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Cellulose microfibril synthesis
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Cellulose microfibrils of primary cell wall Plant cell expansion
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Vegetative Shoot apical meristem (SAM)
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Vegetative shoot apical meristem (SAM)
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Confocal microscope image of Arabidopsis root
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Cyclin::GFP
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Which cells are the stem cells?
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0d 1d 3d 5d Effect of ablation of quiescent center (QC) on tissue- specific marker gene expression (from Sabatini et al., 1999, Cell 99: 463-472) The Quiescent Center is the stem cell niche
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Regulatory function of Rb protein
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Wild type Rb-related RNAi silenced Silencing Rb-related gene results in extra stem cells Wildwater et al. (2005) Cell 123: 1337-1349 (Brown marks starch in differentiated root cap cells.)
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Control Ectopic Rb-related expression Ectopic expression of Rb-related gene results in loss of stem cells Wildwater et al. (2005) Cell 123: 1337-1349 (slight overexpression) (strong overexpression)
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