EEB340H1 Lecture : EEB340 - Lecture 3

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Lecture 3: origin of land plants: evolution of meristems and parenchymatous growth. Anthocerophyta-to-seed plants third important trait essential to survival on land parenchymatous growth. Parenchymatous tissue produces volume in 3d multiple cells, not one big cell anymore. Phragmoplast: array of microtubules involved in cell plate formation: telophase and cytokinesis, guide golgi-derived vesicles to where new cell plate/wall being formed, guide smooth er to those regions (pectin-rich regions) Plasmodesmata: critical in controlling plant growth and development: control communication between cells. Meristem: region of undifferentiated, actively dividing cells: source of cells for rest of plant if organism in vegetative stage, meristem is indeterminent (constantly dividing) Hornworts have a single apical cell in their meristem. Hornworts have only a thalloid morphology liverworts have thalloid morphology or leafy morphology: thalloid may have multiple meristems also leafy, single apical cell. Mosses are leafy (in main, mostly photosynthetic form: single apical cell.

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