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Toxicity of Micronutrients – Definition, Types, Functions

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Mineral Nutrition is characterized as the normally occurring inorganic supplement found in the soil and food that is essential for the appropriate working of plant bodies and animals. Minerals are imperative components essential for the body. Both plants and animals require minerals basically. For instance, Zinc is vital for the production of protein and for cell division.

Supplements(Nutrients) that are required for plants in tiny amounts are named Micro Elements or micronutrients. Some of them incorporate boron, copper, manganese, iron, chlorine, and molybdenum. Supplements that are expected by plants in bigger amounts are named Macronutrients. Some of them incorporate sulfur, nitrogen, carbon, phosphorus, calcium, potassium, and magnesium.

Role of Nutrients

  • Adjusting capability: Some salts or minerals act against the hurtful impacts of different supplements consequently adjusting one another.
  • Support of osmotic pressure: Several minerals cell sap is available in natural or inorganic structure to control the natural pressure of the cell.
  • Affecting the pH of the cell sap: Different anions and cations impact the pH of the cell sap.
  • Development of the plant body: Carbon, Hydrogen, and Oxygen are components that assist to build the plant body by entering cellular material and constitution of the wall.
  • Catalysis of the biochemical response: Certain components like zinc, magnesium, calcium, and copper go about as metallic catalysts in biochemical reactions.
  • Impacts of Toxicity: Certain minerals like arsenic and copper poisonously affect the cellular material under unambiguous circumstances.

Toxicity of Mineral Nutrients 

  • A moderate increase in micronutrients causes mineral toxicity.
  • Any mineral ion concentration in tissues that decreases the dry weight of tissues by around 10% is considered toxicity.
  • Excess of a component might hinder the take-up of another component.
  • For instance, the noticeable side effect of manganese toxicity is the presence of earthy-colored spots encompassed by chlorotic veins. Manganese rivals iron and magnesium for take-up and magnesium for restricting proteins. Manganese additionally hinders calcium movement in shoot peaks; accordingly, excess manganese might prompt a lack of iron, magnesium, and calcium.


Elements of a portion of the Micronutrients are expressed beneath:


  • It is a part of oxidase, cytochrome oxidase, phenolases, and ascorbic corrosive oxidase that is liable for enacting the catalysts.
  • Copper assumes an essential part in photophosphorylation.
  • It likewise assists with adjusting carb nitrogen guidelines.


  • It is important for photosynthesis during the photolysis of water.
  • The mineral is expected for the amalgamation of chlorophyll.
  • It goes about as an activator of nitrogen digestion.


  • It is fundamental for the union of tryptophan, digestion of carbs, and phosphorus.
  • It is a constituent of compounds like liquor dry-out gas, carbonic anhydrase, lactic dehydrogenase, hexokinase, and carboxypeptidase.

Frequently Asked Questions

Question 1: What is the significance of sulfur in plants? Name the amino acids which contain it?


It is a significant macronutrient in plants that are consumed by plants as a particle. It essentially works as a part of proteins, vitamins(thiamine, biotin), coenzyme-A, amino acids (methionine, cysteine), and so forth. Likewise, it is a vital part of partner sulfide (garlic, onion) and sinigrin(mustard). Sulfur-lack can cause chlorosis in youthful leaves, the arrangement of hard and woody stems, broad root development, and so on. It likewise brings about a decrease in the juice content of citrus leafy foods and illness of tea. Sulfur is tracked down in amino acids methionine, cysteine, and so forth.

Question 2: What is the meaning of Pseudomonas and Thiobacillus in the nitrogen cycle?


They are denitrifying microscopic organisms that convey our denitrification in the nitrogen cycle, wherein under anaerobic circumstances, nitrate present in the dirt is diminished back to nitrogen oxides accordingly adding to the climatic nitrogen.

Question 3: Which is the main catalyst present in pull knobs for obsession? For its work, does it require the pink shaded color? Explain?


Its Nitrogenase catalyzes the transformation of barometrical nitrogen to alkali. Leghaemoglobin is the pink hued shade. Indeed, it is expected as it makes anaerobic circumstances for the working of the nitrogenase catalyst.

Question 4: In relationship with the grouping of a fundamental component in plants, separate between ‘basic fixation’ and ‘lacking’. Track down the ‘basic fixation’ and ‘inadequate’ values for – Fe and Zn?


Basic fixation is a grouping of a supplement that is estimated in tissue, just underneath the level that gives the most extreme development. Model- K, P, and N are basic components though insufficient is the focus underneath the basic fixation and the absence of supplement components can prompt an inevitable drop in the plant development.

Basic Concentration Deficient
Fe 3.5 – 5%   Less than 3.5%
Zn 0.5 – 1%  Less than 0.5%

Question 5: What are the essential elements for plants? State criteria for their essentiality. Give the grouping of minerals premise the sum in which they are expected by plants.


An element is supposed to be essential for a plant in the event that it is expected for keeping up with its not unexpected development and multiplication. This necessity should be determined and can’t be supplanted by some other component in the soil and ought to be straightforwardly engaged with plant digestion. Following are the rules for essentiality:

  • A plant finishes its life cycle in the lack of the element and is unfit to ordinarily develop.
  • The component can’t be subbed by another element and is explicit.
  • The element is significant in plant digestion.
  • Essential elements are additionally partitioned into:

Full-scale elements – Required by plants in bigger amounts, they are H, O, N, Mg, Ca, and S.
Microelements – They are alluded to as the following elements and are required in low amounts, they are Zn, Cu, Mo, Cl, and Fe.

Question 6: What will it be valuable to plants assuming that they are provided with abundance supplements? If no, why, and if indeed, how?


No, it isn’t valuable as higher dosages of micronutrients might become harmful. Poisonous focus is any fixation that diminishes the dry load of tissue by 10%. Notwithstanding, basic fixation contrasts for different micronutrients and various plants. For example, past 600μ is harmful to soybean and past 5300μ for sunflowers. These harmful impacts can be either because of impedance in the retention and working of supplements or because of the abundance of the micronutrient. Model – Toxicity in manganese can be expected to:

  • A reduction in the take-up of iron and magnesium.
  • Prevention of calcium movement into shoot summit.
  • Impediment of restricting of magnesium to explicit catalysts.
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Last Updated : 23 Jul, 2022
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