Rice Blast Fungus (IMAGE) Tokyo University of Science Caption During infection in rice blast fungus, chitin from its cell wall breaks down into chitosan and acetic acid. This process stimulates cell differentiation in the host plant, leading to appressorium formation, which then facilitates the infection process. Credit Dr. Takashi Kamakura Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.