Summary
Chloroplast (cp) and mitochondrial (mt) compartments of normal (N) and cytoplasmic male sterile (cms) lines of Brassica napus have been characterized and compared on the basis of cp and mt DNA restriction enzyme analysis and in vitro protein synthesis by isolated mitochondria. Cytoplasmic male sterility of B. napus (rape) comes from cms Raphanus sativus (radish) through intergeneric crosses.
Cp DNAs isolated from N and cms lines had distinct restriction patterns with Sal I, Kpn I and Sma I enzymes. The size of the two cp DNAs measured from the restriction patterns was found to be identical and of about 95 × 106 d. N and cms lines of B. napus were characterized by specific mt DNAs, as shown from Sal I, Kpn I, Pst I and Xho I cleavage patterns. The small number of well-separated restriction fragments obtained with Sal I enabled us to determine precisely mt DNA sizes. The values of 136.5 and 140.3 × 106 d, obtained from restriction patterns with N and cms DNAs respectively, are smaller than any of those previously obtained from studies on other genera. With molecular hybridization experiments, it was possible to distinguish N and cms lines by the different locations of rRNA genes on the cp and mt DNAs.
Two lines of B. napus are characterized by specific mt translation products formed in isolated mitochondria.
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Communicated by D. von Wettstein
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Vedel, F., Mathieu, C., Lebacq, P. et al. Comparative macromolecular analysis of the cytoplasms of normal and cytoplasmic male sterile Brassica napus . Theoret. Appl. Genetics 62, 255–262 (1982). https://doi.org/10.1007/BF00276248
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DOI: https://doi.org/10.1007/BF00276248