Abstract
Abstract Several anatomical and ultrastructural features, as well as some related physiological parameters, have been studied in green and white sectors of Scindapsus aureus variegated leaves. Incidence of structural variations in dark respiration rates of leaves also has been considered. Total chlorophyll content of white sectors is about 2% that of green ones. Dark respiration rate in white sectors is about half that measured in green sectors. There are no differences anatomically between both types of sectors. Plastid number and plastid long axis length are greater in green than in white sectors. Such differences explain why the plastid area to leaf area ratio in white sectors is about half that of green sectors. This ratio has been related to differences in dark respiration rate between green and white sectors. Mutant plastids are typical photobleaching mutants. There seems to be a good correspondence with Knoth's model for plastid degeneration. Mutant plastids have an extensive system of peripheral reticula.
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