Agami R. A (2014) studied the role of melatonin in barley plants under saline condition. An experiment was performed with 1 mM melatonin solution to study its effect on growth and yields of barley plants under salt stress (100 or 200 mM NaCl). The barley plants exposed in salt stress reduced all the growth parameters but the treatment through melatonin in salt stress enhanced all the growth and yield parameters.
An experiment was performed by sterilizing the Brassica juncea seed with 3 % hypochloros acid for thirty minutes. Then seedlings were placed into petri plates on filter paper with different melatonin concentrations of 100, 10, 1 and 0.1 mM in 0.02% dimethylsulfoxide. Control plants contained only distilled water. The results indicated
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(2016) determined the effect of melatonin in Zea mays seedlings in drought stress. The maize seedlings were foliar-sprayed with 100 μmol/L melatonin. It was noted that melatonin had no effect in normal situation. Under drought condition the growth of mays seedlings significantly reduced nut this reduction controlled by foliar expression of melatonin. Melatonin treated seedlings improved their earlier reduction quickly than non treated seedlings. Melatonin enhanced the rate of photosynthesis and transpiration under drought stress. It was also determined that drought stress increased the H2O2 and MDA contents but melatonin expression decreased this …show more content…
The seeds of two wheat genotypes (Sarsabz and S-24) will be collected from Ayub Agricultural Research Institute Faisalabad. The experimental design will be completely randomized with factorial arrangement. The seeds of wheat genotypes will be sown in soil with salt stress (control and 10 dS/m) and different melatonin treatments (0, 50, 100, 300 and 500 µM) will be foliarly applied.
Morphological Parameters
Shoot and Root length of the plant will be calculated by meter rod in centimeters. The fresh and dry weight of shoot and root will be determined in kilogram by using the electrical balance.
Chlorophyll contents
Chlorophyll contents (chlorophyll a, chlorophyll b, total chlorophyll and carotenoid contents) will be determined by the method of Arnon 1949.
Biochemical
Hypothesis: If one-day pinto bean seedlings are soaked in a water solution, 1% NaCl solution, and 3% NaCl solution, the seedlings exposed to higher sodium concentrations will have decreased cellular respiration rates. Treatments: This experiment involved three treatments and a control. The goal of the experiment was to see how different levels of NaCl affect the rates of cellular respiration in day-old pinto bean seedlings.
In addition, the average height of the seed, with pure water, after 8 days, was 8.9 centimeters whereas the average height of the seeds with 4% of “Miracle Gro” was 0.3 centimeters. The difference there is a whopping 8.6 centimeters. Not only that, but the seeds have a coating and when it separates from the seed that signals that the seed is beginning to germinate. After the 8 days, the seeds with only water were all separated from their covering, while the 4% solution only had 2 beginning to peel. Finally, we concluded that because of osmosis, the seeds with more “Miracle Gro” were bound to grow the least.
To test the hypothesis the impact of temperature on milkweed bugs, they will be placed in three different temperature conditions. The temperatures include: 10°C (refrigerated), room temperature 22°C and at 28°C. These various temperatures represent the lowered temperatures from the milkweed bugs optimal temperature (28°C). The day and light cycle for these conditions will be 16L:8D. To test the hypothesis of the effect of light regime on development, milkweed bugs were placed in 22°C condition with a 16L:8D cycle and 22°C condition with a 2.5L:21.5D cycle. About 35 milkweed bug eggs will be placed in a clear container for each treatment group.
We made high and low density treatments of ten seeds and two seeds respectively. Each treatment had water, soil, and fertilizer. The height and survivorship from each treatment was averaged over four weeks. These results show no significant difference between the high and low treatments.
If the experiment was completed again, more higher concentrations could be applied to the seeds to see if the data is further supported. Either way the more trials the better and more accurate results, this applies to any experiment. Practical applications of the principles of this investigation may be using the correct concentration for a specific plant or seed. This lab shows that it is necessary to follow the directions and specifications when using the fertilizer miracle
Can Alka-Seltzer Act as a Buffer Against Acid Rain? Background: Acid rain is a product of rainfall being tainted by atmospheric pollution. This also means that it has high levels of hydrogen ions. When acid rain falls it has negative effects on natural environments such as aquatic life, plants, and infrastructure.
Cell Respiration Lab Research Question What is the optimal temperature for germinating pea-seeds where the rate of respiration is the greatest? Background Information Cell Respiration refers to the biochemical process conducted by the cells of an organism that combines glucose and oxygen to produce energy in the form of ATP, along with two by-products, water and carbon dioxide. The equation representing this chemical reaction is shown below. C6H12O6 + 6 O2 6 CO2 + 6 H2O
Melatonin - useful The prescription of melatonin in children and adolescents has slowly increased over the past decade. The appropriateness of this has repeatedly been questioned in the press, since melatonin by Apoteket classed as hypnotics. In an article in the Swedish newspaper Svenska Dagbladet January 9, 2013 performed a known sleep physicians additionally claim that melatonin can interfere with sexual development if given to children. Both the doctor and the responsible medical editor has refused to deny this false rumor, although they have current references that show that they are wrong.
Because carbon dioxide is absorbed by the plant during photosynthesis less carbon dioxide present in the chamber is a sign that photosynthesis is working. The four lights used for this experiment range across the light spectrum on both sides in order to test a wider variety of wavelengths. All lights will be placed directly on the spinach leaf at the same distance so as not to give any spinach leaf a different light intensity, which could affect the data. This experiment will be able to show which light, ranging across the light spectrum, will allow the Spinach to perform photosynthesis more efficiently.
The null hypothesis, “There is no difference in the concentrations of NaHCO3 and the rate of photosynthetic activity.” is rejected. The alternative hypothesis is supported, that which the greater concentration of NaHCO3, the greater the rate of photosynthesis. Since it was found that the p-value was less than 0.05 in table 1 in all five treatments, this allows the null hypothesis to be rejected. This finding correlates with real life observations of faster rates of oxygen production during lab within the higher concentrations of
Jaspreet Singh Professor Paratore Biology 1 November 1, 2014 Spectrophotometry Identifying Solutes and Determining Their Concentration Statement of the Exercise or of the Problem The purpose of the lab experiment was to attain the following objectives: • Learning to Operate the Spectrophotometer • Construct absorption spectra for cobalt chloride and chlorophyll. Hypothesis If greater and higher concentrations of cobalt chloride are added to each solution then greater amounts of light would be absorbed by each solution. Thus a liner relationship will result in which the absorbance of a substance would be proportional to its concentration, which will be depicted, in a linear graph.
The overall project goals and central questions that has to do with the project is mostly trying to determine the isotonic concentration of the salt in potato roots and the use of the ideal soil salt conditions for the potato plant growth. In part 2, we had to test the enzyme activity that is in the was involved in the potato, so we can also determine the ideal soil pH conditions for the potato plant growth. In part 3, we were able to test absorb the leaf pigment at various wavelengths that determine the optimum light absorption conditions and was able to make recommendations for the light conditions that would be used un greenhouses. The goal of the first project is to determine the ideal soil salt for potato roots and we can relate this to the project is to find out if Solution A or Solution B has more solute in it. The goal of this project is to determine the meaning of Osmosis.
This experiment is an attempt to investigate the amount of water potential across root storage plant species. The root storage plant species that shall be used are the carrot and the potato and the method that shall be used is known as Chardakov’s method. Water potential is the tendency of water to enter or leave a cell. Water moves from an area or region of low water potential to an area of high water potential. It is important to note that the highest water potential is 0(the water potential of pure water) and the other water potential values are in negative numbers .
RESEARCH QUESTION Which one has a higher rate or respiration between dicotyledonous (peas) and monocotyledonous (maize) seeds and what is the effect of temperatures (room temperature, 40, 60) on the rate of respiration as determined by oxygen usage estimated with a respirometer? AIM The aim of this experiment is to investigate which seed has a higher rate of respiration and how different temperatures (room temperature, 400C, 600C) affects the rate of respiration of dried, fresh and germinating monocotyledonous (peas) and dicotyledonous (maize) seeds.
Introduction Plants are a major necessity in the balance of nature, people’s lives, and our terrain. We may not realize it, but plants are the ultimate source of food for almost 95% of the world population so says the National Group of Food. It’s a fact that over 7,000 species of plants are being consumed today. Plants are one of the reasons that we get clean water; as they help regulate the water cycle.