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Before germination, a seed goes through a resting period called dormancy. Germination of seeds is a complex physiological process that starts by imbibition of water after possible dormancy mechanisms have been released by the appropriate triggers, meaning that it resumes growth, bursting through its encasing. (The Seed Biology Place, 2009) This coat acts to protect the internal embryo from the elements, parasites and mechanical injury while it is still dormant (Washington State University 1999). Germination can only take place under specific circumstances, involving suitable temperature, oxygen supply, water, and sunlight. For a seed to germinate, it takes different times depending on the species, although this can be speed using various methods.
Dormancy is “a condition typified by extremely low metabolic rate and suspension of growth and development” (Urry, Cain, Wasserman, Minorsky & Reece, 2017) In plants, dormancy is caused by many factors, including light, temperature, moisture and the presence of Abscisic Acid (ABA), that slows growth, promoting seed dormancy. (Urry, Cain, Wasserman, Minorsky & Reece, 2017) All these things would be typically overcome in the seed’s natural environment. Thus, it is important to maintain water, oxygen and temperature and optimum levels for germination.
Temperature is important, as it can affect the presence of germination inhibitors (RCN 2004). When the temperature is not ideal, these chemicals continue to prevent the continuation of growth of the embryo, to ensure that the seed germinates under favorable conditions for continued growth and metabolism. The favored temperature for germination varies greatly between plant species, depending on their environment.
If there is an insufficient supply of oxygen, germination may not take place (Aggie Horticulture 2009). Oxygen is a requirement for respiration, meaning that a lack thereof will cause the plant to die soon after germination.
Before the embryo can burst out of his coat, there is a large intake of water that helps the embryo to expand and burst through its casting (Washington State University 1999).
Light is also a factor for some plants, as plants require it for photosynthesis to occur. When buried too deeply, the plant will die eventually due it runs of the food supply that could not de replenish (Aggie Horticulture 2009).
Plants have a tolerance level for the salinity of their substrate, within which they will germinate. Soil and water both have small concentrations of salt naturally present, which plants have developed to tolerate (ABC 2006).
Is Will increasing the salinity of the substrate negatively affect the rate of black bean seed germination?
Five trials will be done with the following concentrations of solution:
Number of days for seeds to germinate.
Amount of Water – All the seeds will be given 100mL of water at planting, and they were not given anymore. They will all be receiving the same amount of water with different concentrations of salt. Water is retained by laying transparent plastic wrap over the containers to prevent water from evaporating off.
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