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Disturbed grana-formation in chloroplasts of a Chlorina-mutant of Arabidopsis thaliana (L.) Heynh.

Planta, ISSN: 0032-0935, Vol: 65, Issue: 2, Page: 105-128
1965
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  • Citations
    19
    • Citation Indexes
      19

Article Description

Chloroplasts in the palisade cells of rosette leaves of Arabidopsis thaliana have been compared in the green wild type and in a vital chlorina mutant (ch) using light-, fluorescence-, and electron microscopy. In the chloroplasts of the wild type in face view a regular distribution of grana was revealed by light- and fluorescence microscopy. In side view under the electron microscope the formation of grana and intergrana regions corresponds to the reported chloroplast fine structure in other higher plants. In the chloroplasts of the mutant form this normal grana formation is not visible when analysed under the light- and fluorescence microscope. Under the electron microscope, three different types of chloroplasts have been distinguished: type I, in which the thylakoid system remains largely undifferentiated; type II, in which stacking processes take place comparable to those reported for the Anthoceros chloroplast but different from those of the wild type plastid in Arabidopsis; and type III, in which the stacking of thylakoids leads to a predominantly conjunctive arrangement which may reach the aspect of "normal grana" in side view. On the basis of complete series of cross sections spatial models have been constructed for the more complicated stacking in chloroplasts of type II and III, and their development has been explained by invagination and sliding over processes. © 1965 Springer-Verlag.

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