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Crop science project report: Seed Germination

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Research associate/Agriculturalist
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General public
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biology
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BSc Monash...

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Mohamed Rifkhan M.
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case study
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  1. Introduction
  2. Objectives
  3. Methodology
  4. Results
  5. Discussion
  6. Conclusion

Cultivation of many crops required for food production, depends on the germination of seeds, although there are exceptions where vegetative propagation is carried out. The seeds of legumes and cereals are themselves some of our most important food sources, but their importance lies within the protein, starch and oil storage reserves which are laid down throughout the development and maturation of the plant. Germination begins with the uptake of water by a seed in a process known as imbibition and usually ends, with the beginning of elongation of the radicle (Bewley & Black, 1994).

Seeds do not germinate until they have absorbed water. Embryos in mature seeds are dehydrated and so for active metabolism a watery environment is required.

When a seed is germinating numerous materials are produced and others degraded as the metabolic machinery has been turned on. So water is an absolute requirement for these metabolic processes. Absorption of water into a dry seed is called imbibition and as a seed absorbs water it swells to many times its original size. Imbibition in cells occurs by adhesion of water into and onto materials in the seed like cellulose, starch and pectin. So water molecules are attracted to these materials by attraction between unlike materials, called adhesion. Moreover, germination and growth needs energy which is obtained by conversion of food molecules present in the endosperm or cotyledon of the seeds to ATP by aerobic respiration and usually therefore, oxygen is also needed for germination (Solomon, Berg & Martin, 2005).

[...] So water molecules are attracted to these materials by attraction between unlike materials, called adhesion. Moreover, germination and growth needs energy which is obtained by conversion of food molecules present in the endosperm or cotyledon of the seeds to ATP by aerobic respiration and usually therefore, oxygen is also needed for germination (Solomon, Berg & Martin, 2005). When a seed is said to express dormancy, it means that even when conditions for germination are favourable, such that imbibition, respiration nucleic acid and protein synthesis and many other metabolic events take place, cell elongation for the appearance of the radicle does not take place for reasons that are still vaguely understood. [...]


[...] Each protein is coded for by a different gene. The main function of phytochrome is to detect day length (Solomon, Berg & Martin, 2005). Seeds are normally known to germinate when they are released from the fruit but some seeds undergo precocious germination which takes place inside the fruit. (483 words) OBJECTIVES This experiment aimed at assessing the possible factors that may affect seed germination. Section A of this experiment examined how light affects seed germination while section B studied the effect of planting depth on seed germination. [...]


[...] Then the number of germinated seeds was counted on Day 3 and Day 8. Section Effect of planting depth 4 pots filled with soil were labelled as ?Bean-Deep', ?Bean-Light', ?Lettuce-Deep' and ?Lettuce-Light' bean seeds were placed into the ?Bean-Deep pot', by gently pressing them into the soil about 1.5 to 2 cm below the soil surface. Then more soil was added to cover the seeds and this soil was dampened with distilled water. This was repeated for the pot labelled ?Lettuce-Deep', but with lettuce seeds instead. [...]


[...] Calculations of percentage seed germination Water + Light condition Percentage germination 3rd day = x 100 = x 100 = Percentage germination 8th day = x 100 = x 100 = The percentage germination for the tomato juice + light and the abscisic acid + light conditions were calculated likewise. (639 words) DISCUSSION Section Effect of light The results show that the seeds under both light and dark treatment conditions germinated but the percentage germination for the seeds in the dark was higher, but for lettuce seeds the light treatment produced an increase as shown by the percentage increase in germination. Certain seeds need light for germination whereas others do not have such a requirement. [...]


[...] Crop science project report - Seed Germination INTRODUCTION Cultivation of many crops required for food production, depends on the germination of seeds, although there are exceptions where vegetative propagation is carried out. The seeds of legumes and cereals are themselves some of our most important food sources, but their importance lies within the protein, starch and oil storage reserves which are laid down throughout the development and maturation of the plant. Germination begins with the uptake of water by a seed in a process known as imbibition and usually ends, with the beginning of elongation of the radicle (Bewley & Black, 1994). [...]

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