Citrus Vesicle — Juice Sac Cross-Section at 3:1 Macro

Description

Citrus fruit segments are filled with juice vesicles — the individual elongated juice sacs that contain the fruit juice under slight osmotic pressure. In cross-section, the vesicle structure of a fresh orange is visible through the segment membrane at 3:1 macro: individual vesicles approximately 2-4mm in length and 0.5-1mm in diameter, their thin cell walls distended by the internal juice pressure into approximately cylindrical forms. This image was made of a fresh-cut Valencia orange segment, the cut surface revealing the vesicle cross-section while the adjacent intact segment wall shows the full vesicle length profile. The segment membrane above the cut surface transmits the transmitted light as a parchment-like barrier, the vesicle arrangement visible through it as a directional texture. Each vesicle appears as a warm orange translucent cell, the juice’s beta-carotene and citrus flavonoid pigments producing the characteristic colour that intensifies in the cross-section’s compressed view.