Abstract
SUMMARYUltrastructural observations of young Coleus leaves revealed two pathways of chloroplast development within the same leaf. Developing plastids in the mesophyll cells from the basal regions of a leaf contained dense‐staining inclusion bodies associated with newly forming thylakoids while these inclusion bodies were absent from the plastids in the cells of the leaf tip. Studies of the chemical nature of these inclusion bodies suggest that they are made up of proteins and possibly lipids, with no carbohydrates. The material present in the newly‐forming thylakoids is similar in electron density to the inclusion bodies. The difference in chloroplast ontogeny appears to be related to the difference in cell development between the leaf tip and base.
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