Question

development of dicot embryo biology discussion

Answer 1

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Development of dicot embryo in Cɑpsellɑ bursɑ-pɑstoris (Crucifer type): ... The terminɑl cell by subsequent divisions gives rise to the embryo while the bɑsɑl cell contributes the formɑtion of suspensor. The terminɑl cell divides by ɑ verticɑl division forming ɑ 4-celled 1-shɑped embryo.

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Answer 2

Answer:

Development of Embryo in Dicots:

According to Soueges, the mode of origin of the four-celled pro-embryo and the contribution made by each of these cells makes the base for the classification of the embryonal type. However, Schnarf (1929), Johansen (1945) and Maheshwari (1950) have recognized five main types of embryos in dicotyledons.

I. The terminal cell of the two-celled pro-embryo divides by longitudinal wall.

(i) Crucifer type:

Basal cell plays little or no role in the development of the embryo.

(ii) Asterad type:

Basal and terminal cells play an important role in the development of the embryo.

II. The terminal cell of the two-celled proembryo divides by a transverse wall, Basal cell plays a little or no role in the development of the embryo.

III. Solanad type:

Basal cell usually forms a suspensor of two or more cells.

IV. Caryophyllod type:

Basal cell does divide further.

V. Chenopodiad type:

Both basal and terminal cells take part in the development of the embryo.

Here citing the example of Capsella bursa-pastoris (Shepherd’s purse), the detailed study of Crucifer type of the development of the embryo has been given.