Structure of plastids of a variegated Betula pubescens mutant

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Abstract
The patterns of variegation in the leaves of Betula pubescens only become evident in the mature leaves. However, the young plastids are also abnormal and pigment analysis does not suggest that the deformation of the plastids is caused by carotenoid deficiency. In mature leaves the mutant plastids are badly deformed. Among the most typical defects are an amoeboid form and the budding of peripheral reticular parts from the mutant plastids. These budding parts can easily be mistaken for mitochondria, but a closer inspection reveals differences in their tubular structures. These buds should therefore only be considered a special type of abnormal plastid.

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