Chitinase-Mediated Defense Mechanisms in Transgenic Plants

Chitinases are hydrolytic enzymes that target chitin, a structural polysaccharide in fungal cell walls and insect exoskeletons. In plants, these enzymes form part of the pathogenesis‐related protein repertoire and contribute to basal immunity by degrading invading pathogen cell walls and releasing elicitor fragments. Transgenic approaches harness these activities by introducing or overexpressing chitinase genes from diverse sources—plant, microbial or pathogen—to confer enhanced disease resistance. Transgenic plants often display elevated levels of reactive oxygen species bursts, activation of mitogen‐activated protein kinase pathways and upregulation of defence‐related genes, culminating in broad‐spectrum resistance against fungi, oomycetes and certain bacteria. Chitinase expression can be driven by constitutive or pathogen‐inducible promoters, enabling finely tuned defence responses. Beyond direct antimicrobial action, chitinase transgenes can prime the host immune system, leading to faster and stronger activation upon subsequent pathogen challenge. Field trials in key crops such as rice, wheat and tomato have demonstrated reduced disease incidence and improved yield stability under pathogen pressure. Ongoing efforts focus on stacking multiple chitinase classes, optimising subcellular targeting and combining chitinase transgenes with other defence genes to achieve durable resistance while minimising off‐target effects on non‐pathogenic symbionts.

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Chitinase-Mediated Defense Mechanisms in Transgenic Plants publication trend

The graph below shows the total number of articles in chitinase-mediated defense mechanisms in transgenic plants across all publications each year (not limited to Nature Index journals).

Technical terms

Chitin: A long‐chain polymer of N‐acetylglucosamine forming the main structural component of fungal cell walls and insect exoskeletons.

Chitinase: An enzyme that hydrolyses chitin into smaller oligosaccharides, weakening pathogen cell walls and releasing immunogenic fragments.

Reactive Oxygen Species (ROS): Chemically reactive molecules containing oxygen, produced rapidly in plant cells as an early defence response against invaders.

Pathogen‐Associated Molecular Pattern (PAMP): Conserved microbial molecules recognised by plant receptors, triggering innate immune responses.

Transgenic Plant: A plant that has been genetically modified to contain and express a foreign gene, often to confer novel traits such as disease resistance.

References

1. Overexpression of chitinase PbChia1 from Plasmodiophora brassicae improves broad-spectrum disease resistance of Arabidopsis. Virulence (2023).
2. Characterization of soybean chitinase genes induced by rhizobacteria involved in the defense against Fusarium oxysporum. Frontiers in Plant Science (2024).
3. Chitinases—Potential Candidates for Enhanced Plant Resistance towards Fungal Pathogens. Agriculture (2018).