STRUCTURE AND ULTRASTRUCTURE OF PLASTIDS IN LIGHT-AND DARK-GROWN ZAMIA FLORIDANA DC. SEEDLING ROOTS IN VITRO

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Summary

In dark grown aseptic seedling cultures of Zamia floridana DC. amyloplasts with many tightly packed starch grains developed in root cortical cells. In similar cultures exposed to 12 h photoperiods of 5 klx, plastids with characteristics of chromoplasts, chloroplasts and amyloplasts were formed. Light appeared to alter the pathway of plastid development and led to the formation of chloro-chromo-amyloplasts in these roots.

Ancillary