16 Sep 2026

What Are The Nutritional Requirements for Plant Tissue Culture

Anjali Singh, MS

As a content and community manager, I leverage my expertise in plant biotechnology, passion for tissue culture, and writing skills to create compelling articles, simplifying intricate scientific concepts, and address your inquiries. As a dedicated science communicator, I strive to spark curiosity and foster a love for science in my audience.

Table of Contents

Summary

Plant tissue culture requires a carefully balanced supply of nutrients and other components for healthy growth in vitro. This guide explains the nutritional requirements of tissue-cultured plants, covering essential macro and micronutrients, carbohydrates, vitamins, phytohormones, and gelling agents, along with their roles in plant growth and development.

Introduction

You must already know that plants need minerals, nutrients, water, and sunlight for their proper growth and development in the natural environment. Plants extract their nutrients from the soil, and with the help of sunlight, they make their own food.

However, when plants are grown in the lab environment without soil, they need a supply of nutrients through the media used to grow plants. The composition of the medium is a key factor that determines the success of a plant in the lab environment.

But when we talk about nutrients, what nutrients do plants “exactly” need for their development?

Nutrients, by definition, are substances that are required by living organisms for their basic functions.

A typical basal medium is composed of a well-balanced blend of macronutrients and micronutrients, typically including salts like chlorides, nitrates, sulfates, phosphates, and iodides of calcium, magnesium, potassium, sodium, iron, zinc, and boron. Additionally, it includes a carbon source, vitamins, phytohormones, and organic additives.

Though some nutrients are essential, some are optional to add—but when added, they boost the growth of plants.

Essential components include inorganic nutrients and organic nutrients, such as carbohydrates, vitamins, and phytohormones. The optional media components include natural extract, activated charcoal, and liquid endosperm.

In this article, we further break down different nutritional components required by plants in lab conditions for their proper growth and development.

Tissue Culture Media

In the lab environment, tissue culture media are the medium that supplies plants with their nutritional requirements. Because the nutrients are supplied through media and the plants have no other source to extract nutrients, it's essential to provide micro- and macronutrients that are sufficient for the plants’ growth and development. Any deficiency of any component may lead to little to no growth (and eventually may be the death of the plants in the case of constant deficiency).

The two main requirements of plants in the lab environment are:

• The essential nutrients required for the survival of plant cells, tissues, and organs in a cultured environment.
• Favorable physical conditions, such as pH and osmotic pressure.

Other Factors That Affect Growth in Tissue Culture

Nutrients are an important part of tissue culture media, but they are not the only factors that influence plant growth in vitro.

The physical and environmental conditions surrounding the culture can also affect how tissues respond. Important factors include:

• pH: Influences nutrient availability and the overall condition of the medium.

• Osmotic pressure: Affects the movement of water and solutes between the medium and plant tissues.

• Light: Light intensity and photoperiod can influence growth and development.

• Temperature: Different plant species and culture stages may require different temperature conditions.

• Culture conditions: The type of vessel, medium consistency, and other environmental factors can also influence growth.

For successful tissue culture, these factors need to be considered alongside the composition of the medium.

History/Development of tissue culture media

In the field of plant cell culture, the development of the optimal medium for in vitro cultivation has a long history.

• Early researchers widely employed Knop's (1865) mineral solution.
• Gautherat (1939) later formulated a callus culture medium based on the nutrient solution proposed by Uspenski and Uspenskaia (1925).
• The mineral requirements for plant tissue and organs in culture were systematically studied by Murashige and Skoog (1962).
• Murashige and Skoog’s research was expanded by scientists like Linsmaier and Skoog (1965), Vasil and Hildebrant (1966), and Nitsch and Nitsch (1969), resulting in the development of various media tailored to specific needs.

What Makes Up Tissue Culture Media?

Tissue culture media provide plants with the nutrients and other components they need to grow under in vitro conditions. A typical medium can contain several different components, each serving a specific purpose.

These include:

• Macronutrients: Nitrogen, phosphorus, potassium, sulfur, calcium, and magnesium, which plants require in relatively larger amounts.

• Micronutrients: Elements such as iron, manganese, boron, zinc, molybdenum, copper, iodine, and cobalt, which are required in smaller amounts.

• Carbon sources: Usually sucrose, which provides an energy source for cultured tissues.

• Vitamins: Added to support healthy tissue growth, with thiamine being particularly important in many tissue culture media.

• Plant growth regulators: Compounds such as auxins and cytokinins that influence processes including cell division, differentiation, and shoot or root development.

• Other additives: Depending on the plant species and protocol, media may also contain compounds such as natural extracts or activated charcoal.

• Gelling agents: Agar or other gelling agents are used when a solid medium is required.

The exact composition and concentration of these components can vary depending on the plant species, tissue being cultured, and the objective of the culture.

Nutritional Requirements of the Tissue Culture Plant

Macronutrients vs. Micronutrients

Plant nutrients in tissue culture media are generally divided into two groups: macronutrients and micronutrients.

Macronutrients are required in relatively larger amounts and include nitrogen, phosphorus, potassium, sulfur, calcium, and magnesium. These nutrients support fundamental processes such as cell growth, energy metabolism, and the development of plant tissues.

Micronutrients are required in much smaller amounts, but they are still essential for healthy growth. These include elements such as iron, manganese, boron, zinc, molybdenum, copper, iodine, and cobalt.

Although the quantities required are different, both groups play an important role in supporting healthy growth and development in vitro.

Inorganic salts

In plant cell culture, inorganic nutrients refer to those essential for the growth of normal plants. The optimal concentration of each nutrient, crucial for achieving maximum growth rates, varies significantly. The primary elements include nitrogen (N), phosphorus (P), potassium (K), sulfur (S), magnesium (Mg), and calcium (Ca). Additionally, there are microelements such as cobalt (Co), iron (Fe), boron (B), zinc (Zn), molybdenum (Mo), copper (Cu), and iodine (I).

Macroelements

Nitrogen

Among all mineral nutrients, nitrogen (N) plays a crucial role in the growth and differentiation of cultured tissues. The range of inorganic nitrogen can vary from 25 mM to 60 mM based on specific requirements. Typically, nitrogen is supplied in the form of NH4 along with NO3. However, using ammonium ion as a nitrogen source is generally unsuitable, likely due to the potential for the medium's pH to drop below 5 during culture, leading to reduced nitrogen availability. Cells can be cultivated with NH4 as the sole nitrogen source when the medium is supplemented with organic acids like malate, succinate, citrate, or fumerate. Additionally, it is advisable to keep the concentration of NH4-N below 8 mM. While NO3-N can be used as the sole nitrogen source, there is often a beneficial effect if the medium contains NH4-N.

Phosphorus

Phosphorus is typically provided in the form of phosphates and serves as the primary buffering component in tissue culture media. Elevated phosphorus levels exceeding 2mM can frequently hinder tissue growth.

Potassium

The ideal concentration of potassium required is 20 mM. In the presence of low nitrogen concentration, potassium enhances the formation of somatic embryos. A medium supplemented with potassium nitrate generates more embryos compared to a medium with ammonium nitrate.

Sulphur

Sulfur is administered in the form of sulfates. Additionally, sulfur-containing amino acids like L-cysteine, L-methionine, and glutathione serve as satisfactory sources for sulfur.

Calcium and Magnesium

The optimal concentration of required calcium is 3mM. Antagonism between calcium and magnesium has been demonstrated, indicating that an increase in the concentration of one element raises the requirement for the other.

Microelements

Microelements, including Fe, Mn, B, Zn, Mo, Cu, I, and Co, significantly impact tissue growth in vitro. The availability of iron is reduced at high pH due to precipitation. To mitigate this, iron is supplied as a chelated EDTA complex. These elements can have a toxic effect when applied at higher levels. Optimal tissue growth can be achieved by reducing the concentration of microelements to 10 percent of the original level.

What Happens When Nutrients Are Deficient?

The concentration of nutrients in tissue culture media can have a significant effect on plant growth. When an essential nutrient is unavailable or present at an unsuitable concentration, cultured tissues may show poor growth or other visible abnormalities.

Some common examples include:

However, visible symptoms should not be used on their own to diagnose a nutrient deficiency. Similar symptoms can result from other factors, including pH, nutrient interactions, environmental conditions, or problems with the culture medium.

For this reason, identifying and correcting nutrient-related problems requires looking at the overall culture conditions rather than changing a single nutrient immediately.

Organic nutrients

Carbohydrates

Carbohydrates are used as carbon sources. Carbon is typically derived from sucrose at a concentration of 2-5%. Monosaccharides like glucose or fructose can also be used as carbon sources but are generally less suitable. However, sucrose is the best source since it is dehydrolysed into usable sugars during autoclaving.

Further, small amounts of Myo-inositol are included to encourage cell growth in the majority of plant species. Myo-inositol is thought to contribute to cell division by breaking down into ascorbic acid and pectin, and by being incorporated into phosphoinositides and phosphatidyl-inositol. Typically, it is utilized in concentrations ranging from 50 to 5000 mg.l-1 in plant cell and tissue culture media.

Vitamins

Vitamins are supplemented with the medium to achieve the best growth of the tissues. Among thevitamins, only thiamine HCL (B1) (generally used at a concentration of (used at concentrations ranging from 0.1 to 10 mg.l-1) seems to be universally required. Other vitamins are pyridoxine HCL (B6–used at 0.1-10 mg L-1), nicotinic acid (B3—used at a concentration range of 0.1-5 mg L-1), and calcium pantothenate (B5). The specific requirement of each one varies with the plant species subject to culture.

Different vitamins, including biotin, folic acid, ascorbic acid, pantothenic acid, tocopherol (vitamin E), riboflavin, and p-aminobenzoic acid, find application in certain cell culture media.

However, it's important to note that they do not act as growth-limiting factors. The suggestion is to incorporate vitamins into the culture media when the thiamin concentration falls below the desired level or when cells need to be cultivated at low population densities.

Phytohormones

These are organic compounds, other than nutrients, which influence growth, differentiation, and multiplication. They are required in very minute quantities in the media. The requirement for these substances varies considerably with the tissue, and it also depends on their endogenous level. Many commercially available synthetic substances mimic the PGR specific to certain species. Testing of various types, concentrations, and mixtures of growth substances during the development of a tissue culture protocol for a new species is essential before using a new PGR in plant tissue culture. There are different groups of PGRs commonly used in the media, including:

• Auxins
• Cytokinins
• Gibberellins

Additional substances gaining recognition as hormones in plant tissue culture are abscisic acid, ethylene, polyamines, jasmonates, salicylic acid, and brassinosteroids.

Gelling Agents Used in The Media

Though gelling agents are not as such nutrients for the plants, they aid in supplying the nutrients sourced through the media. The solidification of the medium is commonly achieved using agar. The optimal concentration of agar usually varies between 0.8-1.0 percent (W/V). When the agar concentration is increased, the medium becomes firm, hindering the diffusion of nutrients into the tissues. Therefore, it’s essential to maintain an optimum amount (generally 8 grams) of agar in the media. Gelatin, silica gel, acrylamide gel, and starch copolymers are also utilized as replacements for agar in some processes.

In tissue culture, gellan gum is used extensively used to study root development in vitro. The transparency of the gel offers clear visuals of the roots growing inside the media. Compared to agar, a lower concentration of gellan gum is used in the tissue culture media..

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