Mitochondria: Key Organelles Accelerating Cell Wall Material Accumulation in Juice Sacs of Pummelo (Citrus grandis L. Osbeck) Fruits during Postharvest Storage

Figure 4

Transmission electron micrographs of cross sections of dorsal juice sac (a–d) and septal juice sac (e–g) of pummelo fruit stored for 20 days at room temperature. (a) Overview of the cell structure of a dorsal juice sac. (b–d) Higher magnification micrographs of the regions marked by rectangles in a. Note mitochondrial fission in d. (e) Overview of the cell structure of a septal juice sac. (f and g) Higher magnification micrographs of the regions marked by rectangles in e. Golgi apparatus appeared and the number of mitochondria and vesicles sharply increased in the intracellular space. Cw: cell wall, G: Golgi apparatus, M: mitochondrion, Is: intercellular space, V: vesicle, open arrow: plasma membrane, black arrowhead: dense substances, and white arrowhead: microfibril.