Archaeosporaceae

The fungal mycelium colonizes the root cortex and forms distinct structures called arbuscules. These are the main sites where the exchange of nutrients, such as phosphorus and nitrogen, between the plant and the fungus occurs.

By extending the root surface area through an extensive network of hyphae, these fungi enable plants to access water and minerals that would otherwise be beyond the reach of the root system.

Unlike parasitic fungi that cause diseases, Archaeosporaceae promote plant health and vitality. Their presence is a sign of a biologically active and healthy soil ecosystem.

Taxonomically, they belong to the order Archaeosporales, and their life cycle is strictly dependent on the continuous supply of carbon from the host plant's photosynthetic activity.

Temperature is a critical factor for the development of these fungi, with optimal growth typically occurring between +20°C and +28°C in the rhizosphere. High temperatures during mid-summer may influence the colonization rate.

Soil pH plays a significant role in the viability of spores and the formation of hyphal networks. Slightly acidic to neutral soils are generally more favorable for the symbiosis between Archaeosporaceae and the host plants.

Sufficient moisture is required for spore germination and colonization, while waterlogged or anaerobic conditions can severely inhibit fungal development due to a lack of oxygen in the root zone.

High levels of soil phosphorus and nitrogen can lead to a decrease in the colonization intensity, as the plant may suppress the symbiosis when it can easily obtain nutrients directly from the soil solution.

Soil disturbance caused by intensive tillage practices fragments the mycelial network, reducing the efficiency of the mycorrhizal association and slowing down the recolonization process for the next crop.

Archaeosporaceae are not harmful to crops; in fact, they are beneficial. However, in modern conventional agriculture, their absence is often overlooked, leading to reduced stress resistance in crops.

The "harm" arises when agricultural practices disrupt these natural associations, forcing the grower to rely heavily on expensive synthetic fertilizers and chemical stimulants to achieve the same growth rates.

Lack of mycorrhizal support makes crops significantly more sensitive to drought, salinity, and soil-borne pathogens, as the plant's own biological defense mechanisms are compromised.

Continuous use of non-host crops in a rotation without proper management can lead to a decline in the populations of these fungi, further depleting the biological potential of the farmland.

Loss of symbiosis also leads to lower efficiency in the uptake of micronutrients like zinc and copper, which can be misdiagnosed as simple mineral deficiencies.

To preserve the beneficial mycorrhizal fungi, agricultural practices should focus on reducing tillage intensity. Minimal or zero-tillage systems are highly recommended to keep the fungal networks intact.

Integrating diverse crop rotations that include cover crops can ensure that the soil remains populated with viable spores, maintaining the mycorrhizal potential of the field year-round.

Avoid excessive use of high-solubility phosphate fertilizers. Providing organic sources of nutrients is generally more compatible with the maintenance of symbiotic fungi.

Selective use of pesticides is crucial. Avoid broad-spectrum fungicides that could inadvertently target beneficial soil fungi rather than just the intended plant pathogens.

• Implement reduced tillage practices (No-till/Strip-till).
• Use cover crops to maintain soil biology.
• Avoid over-application of synthetic mineral fertilizers.
• Apply commercial mycorrhizal inoculants if soil health is depleted.