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Chromoplasts Are Formed in Vicia faba Suspensor Cells

In Vicia faba, the plastids of the suspensor have a structure that is unique for this tissue. Their development was followed from 4 to 15 days after pollination (dap), when the suspensor has started to degenerate. The appearence of the plastids changes from small and rounded to large and more or less amoeboid. A distinct peripheral reticulum and ribosomes are present throughout plastid development. At 11 dap, most plastids have formed one or more prolamellar bodies. After zinc iodide–osmium tetroxide staining, the plastids also show strongly electron‐scattering bundles of membrane tubules, sometimes with cross‐linking between individual thylakoids. At 13–14 dap, the thylakoid system includes large electron‐transparent spaces that are traversed by undulating membranes. Such a structure is characteristic of chromoplasts containing carotenoid crystals. In the light microscope, crystals are seen as bright red inclusions in the plastids.