RELATION OF LIGHT TO GROWTH OF PLANTS
So if you want to be a successful farmer, you need to know your photosynthesis and plant light requirements basics. Let's get started then. Plant Physiol. Jan; 19(1): – PMCID: PMC PMID: RELATION OF LIGHT TO GROWTH OF PLANTS. H. F. Thut and W. E. Loomis. Plants grown in varying intensities of light from full sun to darkness show characteristic and well-known differences in growth and development. Much of this.
Introduction If you've ever stayed out too long in the sun and gotten a sunburn, you're probably well aware of the sun's immense energy. Unfortunately, the human body can't make much use of solar energy, aside from producing a little Vitamin D a vitamin synthesized in the skin in the presence of sunlight.Light Reactions - Cell Biology - Photosynthesis
Plants, on the other hand, are experts at capturing light energy and using it to make sugars through a process called photosynthesis. This process begins with the absorption of light by specialized organic molecules, called pigments, that are found in the chloroplasts of plant cells. What is light energy?
Light is a form of electromagnetic radiation, a type of energy that travels in waves. Other kinds of electromagnetic radiation that we encounter in our daily lives include radio waves, microwaves, and X-rays. Together, all the types of electromagnetic radiation make up the electromagnetic spectrum. Every electromagnetic wave has a particular wavelength, or distance from one crest to the next, and different types of radiation have different characteristic ranges of wavelengths as shown in the diagram below.
Types of radiation with long wavelengths, such as radio waves, carry less energy than types of radiation with short wavelengths, such as X-rays.
A light wave or any other form of electromagnetic radiation has evenly spaced crests and troughs. The distance from crest to crest, or, equivalently, from trough to trough, is defined as the wavelength.
Relationship Between Plant Growth & Light Intensity | Garden Guides
Image of a wave, showing the crests, trough, and wavelength crest-to-crest distance. The electromagnetic spectrum is the entire range of wavelengths of electromagnetic radiation. A longer wavelength is associated with lower energy and a shorter wavelength is associated with higher energy. When light shines on a part, it stimulates the secretion of growth hormones called auxins in that area of the stem.
These auxins cause that part of the stem cells to elongate, forcing the stem to grow towards the sunlight. These are changes that occur continuously through the life cycle of a plant.
Seasonal Effects If there is one disadvantage to sunlight, it is the fact that it is not constant all through the year.
The duration and intensity of sunlight received fluctuate with the changing seasons. So plants have adapted to these changing seasons as well.
Relationship Between Plant Growth & Light Intensity
In the summer and spring, with light being plentiful, most plants focus on growth, blooming of flowers, and bearing of fruit. When the light intensity and duration reduces as winters approach, the plants put more emphasis on conserving energy and reducing growth. Photosynthesis is reduced in the fall, and leaves start losing chlorophyll. This is why leaves tend to turn brown, yellow, or red in autumn.
What is Light in Relation to Plant Growth and Development
What we see as visible light is made up of electromagnetic radiation in a specific range of wavelengths. Visible light falls between the wavelengths of nanometers. Light in different wavelengths appears as a particular color to the human eye.
Red light has the longest wavelength and the lowest energy, while blue and violet lights at the other end have short wavelengths and more energy.
This is one reason why energy-rich UV light is considered dangerous Like the cells in the human eye, the leaves in a plant also respond to the light energy falling on it within these nm wavelengths. To be more precise, the chlorophyll in the leaves absorb most of this light to create food.
The radiant energy from the sun, or solar energy, is transformed into chemical energy through the process of photosynthesis. It is stored in the bonds that hold atoms together, as in food that provides the energy to perform mechanical work.
In these cases there is convertion from one form of energy to another in accordance with the first law of thermodynamics: Energy can be converted from one form to another, but it cannot be created or destroyed. However, most of the solar energy is absorbed or reflected back to the atmosphere and becomes heat. The following summary of the fate of the solar energy by Mader further provides more elaboration on what is light: When used by organisms, the energy in food is ultimately converted to heat upon death and decay and released to the atmosphere.
A large proportion of the energy in plant and animal tissues is stored in the fossil fuels that are burned to provide heat energy.