this ppt slide consists of the development of the dicot embryo and monocot embryo.

1. Development of
embryo
Dambar Singh Khatri

2. Behavioral objectives
• At the end of season, students will be able to
• Define the term embryogenesis.
• Understand the concept of development of dicot embryo.
• Describe the development of dicot embryo.
• Explain the development of monocot embryo.

3. What is embryogenesis..
• Embryogenesis is a process that occurs after the fertilization of an ovule to
produce a fully developed plant embryo.

4. Development of dicot embryo
• The zygote divides transversely forming two cells, a terminal cell and basal
cell.
• The cell towards the micropylar end of the embryo sac is the suspensor cell
(i.e., basal cell) and the other one makes to the embryo cell (i.e., terminal
cell).
• The terminal cell by subsequent divisions gives rise to the embryo while the
basal cell contributes the formation of suspensor.

5. Cont …
• The terminal cell divides by a vertical division forming a 4-celled shaped
embryo.
• The terminal cells of the four-celled pro-embryo divide vertically at right
angle to the first vertical wall forming four cells.
• Now each of the four cells divides transversely forming the octant stage (8-
celled) of the embryo.

6. Conti ….
• The octant cell divides in many tires of cell.
• The upper tires gives epidermis.
• Next to this, the layer of cell gives, plumule and cotyledons.
• The layer of cells, which are connected with suspensor gives hypocotyl.
• At the same time, the cell of suspensor which is connected to proembro called
hypophysis.
• It divides into 8 cell. Lower 4 cell forms root tip and upper 4 cell forms cortex of
root.

7. Dicot and monocot embryo development

8. Development of monocot embryo
• The zygote divides transversely forming the terminal cell and the basal cell.
• The basal cell, which is the larger and lies towards the micropylar end, does not
divide again but becomes transformed directly into a large vesicular cell.
• The terminal cell divides transversely forming the two cells. of these, the lower cell
divides vertically into two cell and the middle cell divides transversely into two cells.
• After that, a repeated division takes in both top cell and middle cell.
• The top cell forms the cotyledon and plumule while repeated division of middle
layer gives the hypocotyle and radicle.

9. Thank you