Definition Types Functions and Sources of Mineral Nutrients
What is Mineral Nutrition
Mineral nutrition is not synthesized by living organisms. Plants get these mineral nutrients from soil and human beings and animals get these mineral nutrients from food sources and external food sources which are coming from plants and animals. Minerals belong to one of the part groups of essential elements. These groups are of vitamins, essential fatty acids, essential amino acid. We required some of the major minerals for our growth and proper metabolism; these are calcium, phosphorus, potassium, sodium, and magnesium. While remaining elements which are not essential in such large amounts are known as trace elements, these are sulfur, iron, iodine, cobalt, zinc, etc.
Types of nutrients depending upon their needs:
Mainly There are Two Types of Nutrient, They are:
1. Micro Nutrient: Nutrient which is required by plants and animals body in small amounts. Example: boron, copper,manganese, iron, etc.
Boron
It plays an important role in affecting membrane stability.
It helps in maintaining structural and functional integrity of plasma membranes.
Deficiency of boron affects growth of plants.
Copper
It helps in protein synthesis.
It activates several enzymes which helps in plant growth.
Iron
They play a major role in crop growth and food production.
It is mainly associated with energy transfer property, nitrogen reduction and nitrogen fixation.
Magnesium
It helps in activation of different enzymes in plants.
It activates various metabolic activities.
Molybdenum
It is useful in nitrogen fixation of both symbiotic and non-symbiotic plants.
Chlorine
It is essential for the photosynthetic process.
2. Macronutrients: Nutrients which are required by animals and plant bodies in large amounts. Example: Sulfur, nitrogen, calcium, potassium, magnesium,etc.
Phosphorous
They mainly help in boosting ripening of food along with root growth.
Their deficiency leads to premature fall of leaves.
In fruits and seeds they are in maximum amounts.
Nitrogen
They are mainly present in various coenzymes, hormones, ATP, etc.
They are important constituents of vitamins, nucleic acid, protein and many others.
It is present in the structure of porphyrin molecules which are precursors of chlorophyll.
Due to their deficiency yellowing symptoms appear last in the younger leaves.
Potassium
Potassium is present in the soil in soluble form and they are mainly exchangeable form.
More potassium is required to their proper growth.
They mainly act as a catalyst in enzymatic reactions.
They play a crucial role in carbohydrate metabolism.
Stomatal opening in higher plants requires potassium.
Potassium is essential for translocation of sugar.
Potassium deficient cereal grains develop weak stalks, and their roots become susceptible to root rotting organisms.
Potassium deficiency causes disintegration of pith cells and formation of secondary phloem in tomato plants.
Calcium
Calcium ion functions both as a structural component and as a cofactor for certain enzymes.
Calcium has been associated with the cell wall structure.
High concentration of calcium is required for nodulation and successful symbiotic nitrogen fixation.
Calcium in small amounts is necessary for normal mitosis.
Deficiency of calcium causes chlorotic patches on the leaf and root to become short and brown.
Magnesium
It acts as a structural component like calcium.
It is a component of the chlorophyll structure.
It is also required to maintain ribosome integrity.
Mg2+ ion has a direct role on potassium-sodium stimulated ATPase activity.
Magnesium ions help in protein synthesis by activating nucleic acid synthesis.
Deficiency of magnesium leads to chlorosis of the older leaves.
Magnesium deficiency causes extensive chlorenchyma development and scanty pith formation.
Sulphur
It is a main constituent of biotin, thiamine, coenzyme A and lipoic acid and all these are involved in cellular metabolism.
Deficiency of sulphur causes rapid leaf fall and curling of leaf inward direction.
Role of Nutrients
There are some salts or minerals that act against the harmful effects of the other nutrients thus they balance each other's activities.
There are several mineral cell sap which are present in either organic or inorganic form to regulate the organic pressure of the cell.
Different anions and cations of different nutrients have specific influence on the pH of the cell sap.
Carbon, Hydrogen, and Oxygen are those elements which help to construct the plant body by entering protoplasm and constitution of the wall.
Nutrients like zinc, magnesium, calcium and copper act as metallic catalysts in several biochemical reactions.
Certain minerals like arsenic and copper have a toxic effect on the protoplasm under different defined conditions.
FAQs on Minerals Nutrition in Plants and Humans
1. What are minerals in nutrition?
Minerals in nutrition are inorganic elements required in small amounts for normal growth, metabolism, and body function. Unlike vitamins, minerals are not made by living organisms and must be obtained from food and water.
- They help in building bones and teeth.
- They regulate enzyme activity and metabolic pathways.
- They maintain fluid balance and nerve function.
2. What are the types of minerals in human nutrition?
Minerals in human nutrition are classified into macrominerals and microminerals (trace elements) based on the amount required by the body.
- Macrominerals (needed in larger amounts): calcium, phosphorus, potassium, sodium, magnesium, chloride, sulfur.
- Microminerals (needed in small amounts): iron, zinc, copper, iodine, selenium, manganese, fluoride.
3. What is the function of calcium in the body?
Calcium is essential for bone and teeth formation and plays a key role in muscle contraction and blood clotting. About 99% of body calcium is stored in bones and teeth.
- Supports skeletal strength and structure.
- Enables muscle contraction including heartbeat.
- Participates in blood clotting mechanisms.
- Helps in nerve impulse transmission.
4. Why is iron important in nutrition?
Iron is important because it is a key component of hemoglobin, the protein that carries oxygen in the blood. Without adequate iron, oxygen transport to tissues is reduced.
- Forms part of hemoglobin in red blood cells.
- Supports cellular respiration and energy production.
- Prevents iron-deficiency anemia.
5. What is the role of iodine in the human body?
Iodine is required for the production of thyroid hormones, which regulate metabolism and growth. The thyroid gland uses iodine to synthesize thyroxine (T4) and triiodothyronine (T3).
- Controls metabolic rate.
- Supports brain development in infants.
- Maintains normal growth and energy balance.
6. How do minerals help in enzyme function?
Minerals help enzyme function by acting as cofactors that activate or stabilize enzymes during biochemical reactions. Many enzymes require specific metal ions to function properly.
- Zinc activates digestive and metabolic enzymes.
- Magnesium supports ATP-related reactions.
- Iron participates in oxidation-reduction reactions.
7. What is the difference between macrominerals and trace minerals?
The main difference between macrominerals and trace minerals is the amount required by the body each day. Macrominerals are needed in amounts greater than 100 mg per day, while trace minerals are needed in much smaller quantities.
- Macrominerals: calcium, potassium, sodium — needed for structural and fluid balance roles.
- Trace minerals: iron, iodine, zinc — mainly involved in enzyme and hormone functions.
8. How are minerals absorbed in the digestive system?
Minerals are absorbed mainly in the small intestine through active transport or passive diffusion. The method depends on the specific mineral and body needs.
- Calcium absorption is regulated by vitamin D.
- Iron is absorbed in the duodenum and transported by transferrin.
- Sodium and potassium are absorbed via ion channels and transport proteins.
9. What are common symptoms of mineral deficiency?
Common symptoms of mineral deficiency include fatigue, weak bones, muscle cramps, and impaired growth, depending on the specific mineral lacking. Each deficiency shows distinct signs.
- Iron deficiency: anemia, tiredness, pale skin.
- Calcium deficiency: brittle bones, osteoporosis.
- Iodine deficiency: goiter, slow metabolism.
- Potassium deficiency: muscle weakness, irregular heartbeat.
10. Why are minerals considered essential nutrients?
Minerals are considered essential nutrients because the body cannot synthesize them and must obtain them from the diet. They are vital for structural, regulatory, and metabolic functions.
- Form structural components like bones and teeth.
- Regulate nerve impulses and muscle activity.
- Act as cofactors in enzyme reactions.
