Endochitinases randomly hydrolyse internal β-1,4-linkages of
chitin, releasing oligomers of GlcNAc. Chitin is not present in
plant cells, but is a major component of the cell walls of many
filamentous, possibly pathogenic, fungi. The presence of
endochitinase is therefore part of the plant's defence system
against fungal pathogens as it leads to a disruption in the fungal
cell wall formation together with beta-1,3-glucanases.