ULTRASTRUCTURE OF CELLS FROM CITRUS-SINENSIS FLAVEDO
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1985
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Abstract
The cells that form the flavedo (exocarpium) of different-sized fruits of C. sinensis were compared by EM. Cells from green and ripe fruits are large and oval, with a large vacuole and few organelles inside a very narrow cytoplasm. While cells from green fruits contain chloroplasts, ripe fruits contain chromoplasts and fewer mitochondria and other organelles. The cells are typical of subepidermal parenchyma, surrounded by a thick cell wall which isolates them from secreted essential oils and other secondary products. Isopentenyl pyrophosphate isomerase and prenyltransferase, enzymes from the isoprenoid pathway showed no difference in specific activity in the fruits studied.