1. Plant Development How does plant development differ from animal development? Where do the various parts of a plant come from?

4. = hemicellulose Plant Cell Wall

5. Cellulose microfibrils in cell wall Microtubules beneath plasma membrane

6. Cellulose microfibril synthesis

7. Cellulose microfibrils of primary cell wall Plant cell expansion

10. Vegetative Shoot apical meristem (SAM)

11. Vegetative shoot apical meristem (SAM)

15. Confocal microscope image of Arabidopsis root

16. Cyclin::GFP

17. Which cells are the stem cells?

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19. 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

20. Regulatory function of Rb protein

21. 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.)

22. 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)