Can chitosan – when applied at the right dosage and under certain conditions – promote the growth and activity of beneficial microorganisms?

Studies on subinhibitory concentrations have shown that chitosan in subinhibitory amounts – that is, in quantities that do not primarily act as an antimicrobial – can serve as a carbon source or as a stimulant for biofilm formation and enzymatic activity in beneficial soil bacteria (e.g., certain PGPR, Plant Growth Promoting Rhizobacteria). It has been observed that at such concentrations, the microorganisms grow more vigorously and exhibit enhanced activity, which can contribute to improved plant health.

Possible mechanisms:

Signaling and nutrient source:
Some studies suggest that chitosan acts as a signaling molecule that modulates the expression of specific genes in microorganisms, thereby promoting their growth rate and metabolic activity.

Biofilm formation:
It has been observed that chitosan supports biofilm formation under optimal conditions, which is particularly beneficial for advantageous rhizobacteria, as well-established biofilms can provide plants with an improved protective barrier and enhanced nutrient availability.

ChiProPlant®, is specifically formulated to maintain an optimal molecular structure that enhances its bioavailability and efficacy in stimulating beneficial microbial activity.