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Lecture 3

MODULE 1 LECTURE 3 Plant Cells and Plant Tissue

Biological Sciences
Course Code
Mary Olaveson

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BIOA02 MODULE 2 LEC 3: Plant Cells and Plant Tissue
-two different kinds of cells: 1) undifferentiated cell 2) differentiated
--differentiated cells are like stem cells in animals
-differences between animals and plants: plants have indeterminate
growth (can grow forever if environment permits and animals have
determinate growth (fixed growth)
Undifferentiated Cells
-undifferentiated cells are also called meristematic cells and totipotent
-differentiated cells will only give rise to the same cell
-undifferentiated cells give rise to more undifferentiated cells and
specialized cells
-plants keep a reservoir of undifferentiated cells why plants have
indeterminate growth
-in animals we run out of stem cells (we only have them at the
embryonic stage) whereas plants have undifferentiated cells
throughout their life
I.e. flatworms (male) each have EXACTLY 959 cells (this number
is fixed)
-two kinds of meristematic cells (primary and secondary)
-there are two PRIMARY meristematic groups: one at the shoot (called
shoot apical meristem) and one at the root (called root apical
-as plant grows, it develops SECONDARY meristems from the shoot and
root apical meristem there are many SECONDARY meristems
Adventitious meristem needed to grow leaves
Axillary meristem for side buds and branches
Lateral meristem runs as a tube inside the body of the plant
to increase firth/thickness
Potential meristem for shoots
-primordia leaves encapsulates the soot apical meristem protects it
from the environment layers and layers of leaves
-protection of root apical meristem is different because roots have to
push through the harsh soil
-root apical is set back from the root stem cells divide and send
them to the front to make root cap gets shaved off as it pushes
through but production of root cap cells keeps up with the shaving
Differentiated Cells
-two kinds: simple and complex plant tissue
-simple = 1 type 3 kinds of tissue: parenchyma, collenchyma,
-complex = more than 1 type
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