ALG3 and infection: For example, in Magnaporthe oryzae, the mutant encoding an a‐1,3‐mannosyltransferase ALG3 that is involved in the biosynthesis of N‐glycan of protein N‐glycosylation in the endoplasmic reticulum induces ROS accumulation in plant cells at infection sites, suggesting that N‐glycosylation directly involves host immunity by suppressing ROS production in plant cells during infection.