Seedling Structure

1258 Words6 Pages
Conor O’Donnell
15122301
Seedlings – structure and factors influencing growth

Introduction:
Seedlings is a young plant sporophyte developing out of a plant embryo from a seed. These are ideal for examining and especially examining the root system. In the experiment the seed structure is the main focus and what factors affect/influence seedling growth and timber strength in the long term.
Background:
Germination is the start of the seedling development in the seed. In order for germination to happen the plants needs sunlight, heat and moisture. There is three main parts in the seed:
1. Radicle (embryonic root)
2. Hypocotyl (embryonic shoot)
3. Cotyledon (seed leaves)

The radicle is the first part of the seed
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Examine seedlings in depth focusing on the roots. Structure and function are the two aspects to look at here.
2. To get a section view of the seedling by dissecting it and examine it thoroughly though a microscope.
Equipment:
Seedlings, scalpel, plate and magnifying glass/microscope.
Procedure:
1. With the variety of seedling provided draw the main form of each seedling. Draw the main form for the Pinus (pine), Acer pseudoplatanus (sycamore), and Fagus sylvatica (beech).
2. Identify key features of plant by gross examination i.e. taproot and lateral roots and root hairs. Label if necessary.
3. Once identified, remove some root tips with the scalpel and look for root hairs. Make sure to get samples of each of the taproots, lateral roots and root hairs. Samples should be no wider than the width of a coin to ensure an accurate examination.
4. Make sure you get a good sample to show key parts of the roots structure for e.g. epidermis, endodermis and the cortex. The more samples taken the more in depth the experiment will be.

Results:
Pinus
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Small molecules can flow directly between cells due to the plasmodesmata. Such molecules consist of ions, sugars and amino acids. With the help of actin structures larger molecules like transcription factors and plant viruses can be transported through also. Outside the plasma membrane there is a free diffusional space called the apoplast. It’s interrupted by air spaces between cells of plants, by the cuticle and in relation to this report the casparian strip in the roots. By the continuum of cells walls adjacent to cells and extracellular spaces the apoplast is formed, a tissue level compartment comparable to the symplast. The transport of water and solutes across a tissue or organ is aided by the apoplastic route. This process is known as apoplastic transport. Ions diffuse in the roots into the apoplast of the epidermis before diffusing into the

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