Bio Lecture 7 - Lecture 7: Plant growth composed of 3...

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Lecture 7: Plant growth composed of 3 processes o Cell division results in an increase in the number of cells. o Cell elongation (lengthening of the cell) these new cells elongate as the cytoplasm grows and the vacuoles fill with water, which put pressure on cell walls causing it to expand. o Cell differentiation (when cells specialize) essential for tissue information. When plants grow, their cells divide in a specific area, know as the meristem . (Area composed of cells whose primary function is to form new cells by mitotic division. Meristematic cells DON’T DIFFERENTIATE! (When cells differentiate, they lose their ability to mitotically divide. 2 types of Meristematic Growth in plants o Primary Growth an increase in the stem and root length. All plants have this. Primary growth is a result of apical meristem . o Secondary Growth an increase in the girth of the plant. (Only gymnosperms and woody dicots have secondary growth. Tissues of secondary growth comprise of wood and bark. Secondary growth (growth in girth) occurs in lateral meristem. Apical meristem areas located at the tips of the root and shoot; their activity results in primary growth, including within the buds of stems (buds are dormant embryonic shoots that eventually develop into branches. Cells that have been displaced from the meristem are located in an area of cell elongation, where they continue to grow (and no longer divide) pushing the root tip further into the soil. In and a little past the area of elongation, cells begin to differentiate.
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Bio Lecture 7 - Lecture 7: Plant growth composed of 3...

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