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Maternal inheritance, cytology and macromolecular composition of defective chloroplasts in a variegated mutant of Nicotiana tabacum

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Summary

By phase microscopy of living cells the cause of a maternally-inherited variegated, spontaneous mutation of Nicotiana tabacum L. cv. Turkish Samsun was shown to be the presence of defective chloroplasts. These were intermingled with normal chloroplasts in some of the cells of the mesophyll tissue. In young, expanding leaves, the defective chloroplasts contain traces of chlorophylls a and b in the same ratio as found in normal chloroplasts, but only one-thirtieth of the quantity. As the defective chloroplasts mature, the green pigments disappear. The defective chloroplasts thus appear to be greatly deficient in thylakoid membranes. From their dynamic changes in shape, the defective chloroplasts appear to consist almost entirely of mobile phase, the structure which surrounds the thylakoid system of membranes of normal chloroplasts of higher plants. Consistent with this idea, two constitutents located in the mobile phase of normal chloroplasts—70S ribosomes and Fraction I protein—were detected in defective chloroplasts. The Fraction I protein was unchanged in specific ribulose diphosphate carboxylase activity from enzyme isolated from normal chloroplasts. Speculations are presented that the mutation in chloroplast DNA responsible for the formation of defective chloroplasts cannot be attributed to cistrons coding for the protein of Photosystem II, chloroplast ribosomal RNA or proteins, Fraction I protein, or the DNA-dependent RNA polymerase of chloroplasts.

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Wildman, S.G., Lu-Liao, C. & Wong-Staal, F. Maternal inheritance, cytology and macromolecular composition of defective chloroplasts in a variegated mutant of Nicotiana tabacum . Planta 113, 293–312 (1973). https://doi.org/10.1007/BF00387313

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