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Keywords:

  • Chromoplasts;
  • cycads;
  • plastids;
  • seed colour;
  • ultrastructure

Summary

The ripe seeds of some species of cycads are red in colour and contain chromoplasts: those in seeds of Cycas revoluta Thurb. and Macrozamia lucida L. A. S. Johnson belong to the tubulous class of chromoplast whereas those of Zamia purpurea sp.nov. contain large globules, some packed thylakoids linked by electron-dense bridges, and other unusual structures. The Zamia plastids do not fall clearly into any of the generally recognized chromoplast categories. Some features of the chromoplasts of cycads closely resemble those found in angiosperms; other features appear more typical of plastids in lower plants.