Name: Dissection of Dicot Seed
Uploaded: 2019-07-19
Duration: 4 min 14 s
Description: Seeds are protected by seed coats that can be easily removed by soaking. An embryo can be seen slightly pointing out of the cotyledons. Let's take a close lo...

Question

Describe in brief the embryo formation process in dicotyledonous angiosperm.

Accepted Answer

The embryogenesis of dicots is a complex process that begins with the division of germinated zygote. It divides into a two-cell structure called a proembryo.

The stages of development of a dicot embryo are as follows:

One end of the cell is known as the basal cell and the other end is known as the terminal cell. The basal cell is divided continuously to form a suspensor, whereas the terminal cell divides into a four-cell structure known as the quadrant stage.

These cells again divide and form an eight-cell structure. The upper four-cell structure gives rise to the hypocotyl, whereas the lower four-cell structure forms plumule that give rise to cotyledons and stem tips.

As the cells keep growing the stem tip, ceases to divide and causes the two cotyledons to grow on each side, giving the characteristic two cotyledon structures. The stem tip is also called the plumule. The cells keep dividing and enlargement of the cotyledons cause it to curve and appear as a horseshoe-like structure.

Describe in brief the embryo formation process in dicotyledonous angiosperm.

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