[Crawl-Date: 2026-04-22]
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[URL: https://bio-greenlab.com/en/blog/chitinases-against-phytopathogenic-fungi]
---
title: How chitinases act against phytopathogenic fungi | Bio-Green Lab
description: Mechanism of action of chitinase enzymes against the cell wall of phytopathogenic fungi such as Botrytis, Fusarium and Phytophthora.
url: https://bio-greenlab.com/en/blog/chitinases-against-phytopathogenic-fungi
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og_title: How chitinases act against phytopathogenic fungi | Bio-Green Lab
og_description: Mechanism of action of chitinase enzymes against the cell wall of phytopathogenic fungi such as Botrytis, Fusarium and Phytophthora.
og_image: https://bio-greenlab.com/og-default.png
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# How chitinases act against phytopathogenic fungi | Bio-Green Lab
> Mechanism of action of chitinase enzymes against the cell wall of phytopathogenic fungi such as Botrytis, Fusarium and Phytophthora.

---

[![Scientific evidence — Bio-Green Lab](https://bio-greenlab.com/assets/banner-sidebar-quitinasas-utjNKp9c.jpg) ](https://bio-greenlab.com/ciencia)

## Context: losses, sanitary pressure and the search for finer strategies

In plant health, few threats are as persistent and costly as soil and root phytopathogenic fungi. Globally, the FAO estimates that plant pests and diseases account for losses of between **20% and 40%** of agricultural production each year, with economic costs of enormous magnitude.

20–40%

Annual global losses from pests and diseases (FAO)

27,951 ha

Protected agriculture in Mexico

$3,937 M USD

Mexican berry exports (2023)

In Mexico, this sanitary pressure hits high-value chains where productive consistency is critical: protected agriculture exceeds 27,951 hectares, produces more than 3.5 million tons of vegetables and generates around 110,000 jobs; in addition, Mexican berries surpassed USD 3,937 million in exports in 2023, while tomato continued showing export dynamism in 2024. In other words: when a vascular or root pathogen enters the system, it does not only compromise a plant, but the commercial stability of entire chains.

That context helps to understand why the technical conversation no longer revolves only around "which fungicide to use", but around how to build finer, more sustainable strategies less dependent on a single chemical molecule. Recent literature on disease control insists on two problems with the traditional approach: selection pressure favoring resistance in pathogens and the collateral impact that some intensive programs may have on the microbiota and soil balance.
In parallel, **bioinputs** have stopped being a niche curiosity: the FAO describes them as a gateway to increasingly demanding agricultural markets, and in Mexico the public and technical discussion about their adoption has intensified in programs, training and rural financing.

## The fungal cell wall: a high-value biochemical target

The reason chitinases attract so much attention in phytopathology is simple and powerful: they target a structure the fungus needs to survive. The fungal cell wall is not a passive cover; it is a dynamic architecture that sustains mycelium shape, resists osmotic pressure and participates in growth, branching, infection and adaptation to the environment.

![Molecular structure of the fungal cell wall](https://bio-greenlab.com/assets/molecular-structure-D579KDWh.png)
The most recent reviews agree that the fungal wall is organized around glucans and chitin, with proteins and other polysaccharides that vary according to genus and developmental stage.
Chitin is typically located in inner layers and contributes decisively to the mechanical rigidity of the fungus.
**Key conceptual advantage:** Chitin is not part of plant cells, so it is considered a particularly useful microbial signal for plant recognition and, at the same time, a relatively selective target for biotechnological interventions. The plant and the fungus do not "build" their walls with the same chemical language.
While the plant wall relies on cellulose, hemicelluloses and pectins, many fungi depend on networks of chitin and glucans to maintain their integrity.

## What a chitinase does when it meets a fungus

Chitinases are hydrolytic enzymes capable of breaking the β-(1,4) bonds between N-acetylglucosamine residues, that is, the chemical backbone of chitin. When this hydrolysis occurs on the cell wall of a sensitive fungus, the result can translate into structural weakening, hyphal deformation, loss of integrity, altered germination and, in certain contexts, cellular lysis.
From a biochemical point of view, this is not a non-specific "toxicity", but a **directed depolymerization** of a key structural component.
![Chitinase production in laboratory](https://bio-greenlab.com/assets/chitinase-production-C2nRtNDT.jpg)
Experimental evidence on the direct effect of chitinases on phytopathogenic fungi has been accumulating for decades and continues to expand.
In a classic work, a purified bean endochitinase caused visible deformations in active hyphae of *Rhizoctonia solani*. In another study, a purified chitinase from *Trichoderma* showed convincing hydrolytic action on the wall of *Sclerotium rolfsii*. More recently, research with chitinases from *Streptomyces* and with isolates of *Trichoderma* has again shown antifungal activity or relevant biological suppression against pathogens such as *Fusarium*, *Rhizoctonia* and *Sclerotium*.
**Important nuance:** Not all fungi respond equally to a chitinase, and not all biological efficacy is explained by chitin in isolation. The fungal wall is heterogeneous: the proportion and arrangement of chitin, β-glucans, α-glucans, glycoproteins and even melanins can change between species and conditions.
For this reason, in many systems the best performance appears when chitinolytic activity is integrated with other wall enzymes — such as β-1,3-glucanases — or with antagonistic microorganisms capable of secreting a more complete cocktail. The recent literature itself emphasizes that the specificity of chitinases depends on the isoenzyme, on the architecture of the pathogen wall and on its defense mechanisms.

## Beyond the "breakdown": the generation of biological signals

This is where the topic becomes especially interesting. When chitin fragments, not only does the fungal wall weaken: **chitin oligosaccharides or chitooligosaccharides** are also generated that can function as biological signals. The plant does not perceive these fragments as simple residues; it interprets them as a molecular alert associated with microbial presence.
That perception occurs through **LysM-type membrane receptors**, such as the LYK5/CERK1 systems in *Arabidopsis* and CEBiP/CERK1 in rice and other studied species.
Once the fragment is recognized, the plant activates routes of **pattern-triggered immunity or PTI**, together with defensive signaling cascades and transcriptional changes that strengthen its response capacity.

![Scientist researching plant immune responses](https://bio-greenlab.com/assets/scientist-plant-hands-V4dXonle.jpg)
Recent reviews on plant immunity agree that chitin fragments can act as elicitors or as priming agents.
Recent reviews on plant immunity and carbohydrate elicitors agree that these fragments can act as elicitors or as *priming* agents, that is, they do not necessarily "cure" by themselves, but they can prepare the plant to respond more quickly or intensely to a subsequent attack. That nuance is important: in advanced agronomy, the difference between an input that directly attacks the pathogen and one that improves the physiological preparation of the crop is no longer secondary; it is a central part of the design of modern formulations.

![](https://bio-greenlab.com/assets/industrial-fermentation-tanks-BMaXdcXy.jpg)

"The true value lies not only in having chitooligosaccharides, but in knowing which ones are generated, in what profile and for what physiological objective"

## Chitooligosaccharides and biostimulation: a promising frontier, but dependent on formulation

That is why interest in chitinases does not end in phytopathological control. They also attract attention as tools to generate, through controlled hydrolysis, molecules with potential in biostimulation. Various works and reviews have associated chitin, chitosan and chitooligosaccharides with effects on germination, photosynthesis, root development, biomass and stress tolerance, in addition to defense-related responses. In several cases, these compounds also seem to modulate interactions in the rhizosphere and dialogue with beneficial microorganisms.
**Indispensable scientific precision:** Not every chitooligosaccharide behaves the same. Its effect depends on variables such as the degree of polymerization, the acetylation pattern, molecular weight, dose, application route, plant species and environmental context. Research has also documented that high concentrations can *slow* growth instead of stimulating it.
For this reason, when speaking of biostimulation based on chitin derivatives, the true value lies not only in "having COS", but in knowing which COS are generated, in what profile, with what purity and for what physiological objective.

## Biosynthesis, fermentation and design of functional ingredients

From an industrial perspective, this opens a key question: how to produce chitin hydrolysates or fractions in a more controlled way? The literature on chitooligosaccharide production distinguishes between chemical and enzymatic routes, but grants an important advantage to **enzymatic hydrolysis** when greater specificity, milder processes and better-defined mixtures are sought.

![Intensive agricultural production in greenhouse](https://bio-greenlab.com/assets/images_94-2-zbpe6oh1.jpeg)
Chitinases and other related enzymes allow adjusting the type of oligomers obtained according to substrate and catalytic specificity.
Chitinases and other related enzymes allow adjusting, at least partially, the type of oligomers obtained according to substrate and catalytic specificity. In other words, the biochemistry of the process not only transforms raw material: it **designs functionality**.
That point is especially relevant for laboratories, formulators and R&D areas. In practice, two "chitin-derived" hydrolysates can have very different biological behaviors if they differ in size, acetylation or oligomer distribution. Hence, the most advanced conversation no longer stays at "enzyme yes or no", but at **process variables**: producing strain, fermentation, purification, enzymatic profile, batch analytical control and compatibility with other formulation matrices.
The most recent reviews on plant immunoinducers also insist that the leap from basic science to consistent products depends precisely on that fine control of formulation and delivery.

## What this means for Mexican agriculture

For Mexico, where intensive agriculture, horticultural exports, sanitary pressure and a growing discussion on bioinputs converge, chitinases represent a line of work with much technical sense. Not because they should be seen as a universal substitute for every fungicide, but because they fit into a more sophisticated logic: biotechnological ingredients that can participate in integrated strategies.

3.5M ton

Vegetable production in protected agriculture

110,000

Jobs generated by protected agriculture

Whether by action on chitin-rich fungal structures, by generation of molecular signals useful to the plant, or by their value as a development platform for new formulations. In an environment where the market increasingly rewards sustainability, traceability and consistent agronomic performance, that combination is especially attractive.

## Conclusion

Speaking of chitinases "against fungi" is no longer enough. Their true interest lies in operating on two levels at the same time. First, as **structural intervention tools**, by degrading critical components of the cell wall of various phytopathogenic fungi. Second, as **generators of bioactive signals**, capable of triggering defensive responses and, under certain conditions, effects associated with biostimulation.

That dual role explains why today they occupy such a relevant place in the conversation on agricultural biochemistry, bioinputs and innovation in formulations. The scientific frontier is no longer only in demonstrating that a chitinase breaks chitin; it is in learning to turn that reaction into reproducible, measurable and useful technology for real agricultural systems.
## Disclosure note

This text is a scientific outreach effort on findings documented in chitin biochemistry, plant immunity and agricultural biotechnology. At Bio Green Labs we do not present this content as agronomic diagnosis nor as a commercial promise of field performance.
### Laboratory note

We are a Mexican company focused on the biosynthesis, extraction and B2B commercialization of organic chitinases for research, development and formulation projects. For laboratories, technical areas and companies seeking to explore innovation routes in bioinputs, fermentation or functional ingredients, value begins with a very concrete question: **what enzymatic profile is needed and what type of molecules is to be obtained from it**.

[![Chitinases for Agriculture and Poultry — Bio-Green Lab](https://bio-greenlab.com/assets/quitinasas-avicultura-horizontal-B3iBmtF1.jpg) ](https://bio-greenlab.com/producto)

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## Discovery & Navigation
> Semantic links for AI agent traversal.

* [Context and sanitary pressure](#contexto)
* [The fungal cell wall](#pared-celular)
* [Direct enzymatic action](#accion-enzimatica)
* [Biological signals](#senales)
* [Chitooligosaccharides](#bioestimulacion)
* [Biosynthesis and formulation](#biosintesis)
* [Mexican agriculture](#mexico)
* [Conclusion](#conclusion)
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