Seed Germination

In: Science

Submitted By darshini
Words 2684
Pages 11
Introduction
Seed germination is a process in which the plant’s embryo developed from the seed and forms seedling (Bello, Hatterman-Valenti & Owen, 2000). The process of germination starts with imbibition which is the uptake of water by the dry, followed by the activation of enzyme and ends with the elongation of the radicle. The imbibition stage is a crucial process as it is the first event that moves the seed from a dry, quiescent, dormant organism to the resumption of embryo growth (Bewley, 1997).The breaking of the quiescent and subsequent germination depends on the sufficiency of oxygen, proper amount of water and suitable temperature (Parker, 2000). The penetration of water to the seed coat causes the hard and dry tissues inside to soften. This speeds up the seed metabolism, allowing the water to move quicker as the seed coat splits open. Once the seed are imbibed, the action of enzyme (amylase) takes place (Fenner & Thompson, 2005). It begins during the lag phase of water uptake. The role of enzyme in seed germination is to mobilize nutrients to the growing region of the embryo. Germination of seed is considered complete upon the emergence of radicles from the seed (Copeland, 1999).
Germination only occurs when the seed plant is exposed to a favorable condition. The factors affecting the germination of seeds include oxygen, water availability and temperature. Other factors include hormones, the depth at which the seed was planted and light. In this experiment only the effect of light, planting depth and hormone (abscisic acid) will be examined. There are two ways in which light can influence the germination of seed. It can either inhibit or promote seed germination (Bewley, 1997). Abscisic acid is an endogenous plant hormone that has many roles. It is responsible in promoting the dormancy and maturing of seeds, promotes synthesis of certain storage…...

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