Abstract
1. DNA from female and male Sphaerocarpos donnellii (liverwort) plants exhibits at least two species with buoyant densities of 1.703 (main band) and 1.691 (satellite) g cm-3 in CsCl equilibrium gradients. At least part, if not all, of the satellite DNA is localized in plastids. It consists of up to 90% of uniformly sized circular molecules of an average circumference of 38.5 μm. Compared to other Chlorophyta, the liverwort's cpDNA is unusually low both in diensity and contour length. — 2. On the hand, cpDNA from the ferns Asplenium nidus and Pteris vittata resembles those of higher plants in buoyant density (1.697 g cm-3) and circumference (about 44.8 μm). — 3. Analysis of DNA from the archegoniate chloroplasts with restriction endonucleases indicates chat the cyclic molecules are monomers. — 4. The results show that the circular molecules found in cpDNA of higher plants do not represent the functionally required minimum size of DNA in plastids.
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Abbreviations
- cpDNA:
-
chloroplast
- DNA:
-
nucDNA=nuclear
- DNA:
-
Sal I=restriction endonuclease from Streptomyces albus S
- Eco RI:
-
restriction endonuclease from Escherichia coli, carrying resistance factor 1
- DTT:
-
dithiothreitol (Cleland's reagent)
- Saline-EDTA:
-
0.15 M NaCl, 0.1 M ethylene diamine tetraacetic acid, pH 8.0
- SSC:
-
0.15 M NaCl, 0.015 M Na citrate, pH 7.2
- DNAase:
-
deoxyribonuclease
- Md:
-
Megadalton
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Dedicated to the memory of Prof. Dr. Edgar Knapp
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Herrmann, R.G., Palta, H.K. & Kowallik, K.V. Chloroplast DNA from three archegoniates. Planta 148, 319–327 (1980). https://doi.org/10.1007/BF00388118
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DOI: https://doi.org/10.1007/BF00388118