The results were that exposure to the white light produced the highest percentage of germination rates in the Waldron variety of lettuce seed followed by exposure to the red light. Neither the concept nor the two star lettuce seed germinated. As suspected, the seeds that were exposed to darkness produced the percentage of germination. The far red light also failed to produce any germination in the Waldron variety of lettuce seed. With the seeds germinated, the hypothesis was met in that the white light generated the highest regenerate of germination and darkness caused no germination.
Introduction The purpose of this experiment was to determine what role photometer in lettuce seeds would play when exposed to different types of light. Exposure to light is necessary to the growth of plants. In addition to detecting light, plants are also aware of the lights intensity, wavelength, and direction. All of these factors add to the form and structure of the plant. Photometer, which is a type of chromosome, is important in determining the plants ability to control light responses.
A photometer is a type chromosome that responds to red and far- red light by interconnecting between its two forms, Pr and Pr. The Pr form is sensitive to red light, while the Pr form is sensitive to far-red light (McRae 2013). Materials and Methods Three varieties of Grand Rapids lettuce seeds were used to test the role of photometer in seed germination: Walden, Concept, and Two Star. A total of four Petri dishes were removed in the dark, using only a green spaceflight. They were then labeled with the variety of seed, group name or initials, the date, ND the light treatment.
Alter paper was added to each pert dish and then 2-3 eyedroppers of water were added to each plate so that the filter paper was very moist for germination. Then 25 lettuce seeds were placed into each dish. The light regimens were White, Red, Far-Red, and Darkness. Each dish was exposed to their labeled light regimen for 10 minutes. They were kept level and wrapped in foil immediately after exposure. After 48 hours, the seeds were revisited and the total number of seeds germinated in each dish was determined, then figured into a percentage.
All the information was gathered together and put into graph. Results After forty 48 hours of exposure had passed, the results were viewed. Two Star and Concept varieties had no germination under any type of light. Walden was the only variety of seed to germinate. The total number of germinated seed in each category was divided by the total number of seeds in each variety under each light at the time of the experiment. Then, this number was multiplied by one hundred. This was done to determine the percentage of germination.
This was the formula used to calculate the percentage of germination: [(Number f seeds germinated/ total number of seeds) x 100]. The percentages of germination were both in the Walden category. Red light germination was 3. 6% and white light germination was 7. 1%. Discussion Three varieties of Grand Rapids lettuce seeds were used to determine photosphere’s response to different light exposures: Walden, Concept, and Two Star. The hypothesis was supported by the conclusion the experiment when the evidence of the Walden variety produced germination in both white and red light.
Neither the Concept or the Two Star variety produced and germination n any type of light. There were many different factors that could have played a role in the lack of production including how the seeds were produced, how the seeds were stored, who handled the seeds, what light the seeds had been exposed to previously, the amount of water in each dish, etc. Researchers have found that flowering and other responses to photodiode are controlled by night length, not day length. These researchers found that if the light portion of the photodiode is broken by a brief exposure to darkness, flowering proceeds.