Figure 2.

Two types of the mustard oil bomb. In the dual-cell type of the mustard bomb, glucosinolates are stored in the S cells, whereas classical myrosinases such as TGG1 and TGG2 from Arabidopsis accumulate in the vacuole of myrosin cells. In the single-cell type mustard oil bomb, atypical myrosinases such as PYK10 and glucosinolates accumulate in the ER bodies and vacuole of the same cell. Upon tissue damage, myrosinases obtain access to glucosinolates to detonate the mustard oil bomb by generating chemically active compounds toxic to herbivores and pathogens. ER, endoplasmic reticulum; PM plasma membrane; MVB, multivesicular body.