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

Figure 3

Transmission electron micrographs of cross sections of dorsal juice sac (a–c) and septal juice sac (d–f) of pummelo fruit stored for ten days at room temperature. (a) Overview of the cell structure of a dorsal juice sac. (b, c) Magnified micrographs of the regions marked by rectangles in (a). Note the distribution pattern of organelles and the occurrence of cell wall materials in the intracellular spaces. (d) Overview of the cell structure of a septal juice sac. (e, f) Higher magnification micrographs of the regions marked by rectangles in (d). Note cell wall materials distributed in the intracellular space and filled vesicles. Cw: cell wall, M: mitochondrion, V: vesicle, Is: intercellular space, open arrow: plasma membrane, and black arrowhead: dense substances.

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