BIOA02H3 Lecture Notes - Lecture 3: Meristem, Primordium, Root Cap
5 Feb 2017
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Animals have a specific size that can be reached plants can have newer modules added to them (plants need meristematic tissue to engage in indeterminate growth) Plants have undifferentiated cells that become differentiated depending on location of plants. Create whorls each year (count # of whorls to determine the plant age) >> cells are top give rise to differentiated cells (eg. needles) there are still undifferentiated cells that keep growing. Meristematic cells also contribute to plants having older ages. 959 total cells in adult species of c. elegans (worm) There is a limit to tree growth w/age the growth becomes slower (age begins to plateau around 60) Animal growth is determinant stem cells differentiate in mitotic cell division and never revert back to totipotent cells. Factors that limit plant growth missing soil nutrients, meristematic slowdown, hydraulic pressure (harder to pump water and nutrients to top of plants top dessication) - environmental factors also affect tree growth.
