Upon infection by a pathogen, plant cells increase synthesis of polysaccharides. The function of these polysaccharides is to

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Polysaccharides synthesized by plant cells serve as a physical barrier that isolates the pathogen in the infected tissue, preventing its spread to the rest of the plant. This process is known as the formation of the plant cell wall appositions or papillae. The polysaccharides act as a reinforcement for the plant's cell wall and are also involved in signal transduction pathways that activate defense responses.

Upon Infection by a Pathogen, Plant Cells Increase Synthesis of Polysaccharides