Table of Contents
What are the stages of embryogenesis in plants?
Theoretically, plant development can be divided into two different phases: (1) embryogenesis sensu stricto, which begins with the formation of the zygote and concludes at the cotyledonary stage, and (2) the maturation of the seed (Dodeman et al., 1997).
What are the 3 stages of seed development?
Seed development in flowering plants proceeds in three discrete, although continuous, stages: early, mid-, and late embryogenesis.
Which stage of embryogenesis is also called Dermatogen stage?
globular
All cells then divide periclinally to form the first histologically distinct tissue, the protoderm (Figure 11a). This stage is called the globular or dermatogen stage. The three basic tissue systems (dermal, ground, and vascular) can be recognized at this point based on characteristic cell division patterns.
What is the significance of the Phase 2 during the germination process especially to seeds stored for a long time before planting?
The most important is phase II, which is associated with various cellular and biochemical events such as DNA repair and the translation of stored as well as newly synthesised mRNAs. Phase II is characterised by both increased metabolic and cellular activity.
What is the first stage of embryogenesis?
The early stages of embryonic development begin with fertilization. The process of fertilization is tightly controlled to ensure that only one sperm fuses with one egg. After fertilization, the zygote undergoes cleavage to form the blastula.
What are the four main stages of embryogenesis in Arabidopsis?
Stages of Arabidopsis embryogenesis.
- (A) Early embryo, with a single cell in the embryo proper.
- (B) Early embryo with 2 cells in the embryo proper.
- (C) Octant stage; four of eight cells in two tiers are visible.
- (D) Dermatogen stage.
What is torpedo shaped embryo?
Upright cotyledons can give the embryo a torpedo shape. In some plants, the cotyledons grow sufficiently long that they must bend to fit within the confines of the seed coat. The embryo then looks like a walking stick. By this point, the suspensor is degenerating.
What are the stage of seed germination?
Such five changes or steps occurring during seed germination are: (1) Imbibition (2) Respiration (3) Effect of Light on Seed Germination(4) Mobilization of Reserves during Seed Germination and Role of Growth Regulators and (5) Development of Embryo Axis into Seedling.