Summary
Two circular molecules of different sizes, both belonging to the chloroplast DNA of the brown algaPylaiella littoralis, have been observed by electron microscopy (Dalmon et al. 1983). Clone banks representing 86% of the small chloroplast circular DNA molecule (58 kbp) and 69% of the large circular DNA molecule (133 kbp) have been established and used as tools in the construction of physical maps. Two rDNA operons have been mapped in a very small inverted repeat on the large circular molecule. One 16S rRNA pseudogene and one split 23S rRNA gene have been mapped on the small DNA molecule, far apart from each other. Using heterologous probes, genes for ten different proteins have also been located on these maps. Their arrangement on the large molecule is different from that found in higher plants and algae. Probes fromrbcL, psbA andrps19 genes hybridize to several separated fragments. Two of them (psbA andrps19) hybridize to both types of molecules.
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Loiseaux-de Goër, S., Markowicz, Y., Dalmon, J. et al. Physical maps of the two circular plastid DNA molecules of the brown algaPylaiella littoralis (L.) Kjellm. Curr Genet 14, 155–162 (1988). https://doi.org/10.1007/BF00569339
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DOI: https://doi.org/10.1007/BF00569339